remove

Add STATELESS_LAMBDA support to TemplatableValue class using C++20 concepts:
- Automatically detects stateless lambdas (convertible to function pointers)
- Uses 4-byte function pointer instead of 32-byte std::function
- Falls back to std::function for stateful lambdas

Add StatelessLambdaAction and StatelessLambdaCondition classes for automation:
- Memory: 4 bytes vs 32 bytes per lambda
- Direct function pointer calls (no std::function overhead)

This infrastructure enables template platforms to use function pointers for
stateless lambdas, saving ~28 bytes per lambda instance.

esphome/__main__.py

@@ -731,13 +731,6 @@ def command_vscode(args: ArgsProtocol) -> int | None:
 
 
 def command_compile(args: ArgsProtocol, config: ConfigType) -> int | None:
-    # Set memory analysis options in config
-    if args.analyze_memory:
-        config.setdefault(CONF_ESPHOME, {})["analyze_memory"] = True
-
-    if args.memory_report:
-        config.setdefault(CONF_ESPHOME, {})["memory_report_file"] = args.memory_report
-
     exit_code = write_cpp(config)
     if exit_code != 0:
         return exit_code
@@ -1199,17 +1192,6 @@ def parse_args(argv):
         help="Only generate source code, do not compile.",
         action="store_true",
     )
-    parser_compile.add_argument(
-        "--analyze-memory",
-        help="Analyze and display memory usage by component after compilation.",
-        action="store_true",
-    )
-    parser_compile.add_argument(
-        "--memory-report",
-        help="Save memory analysis report to a file (supports .json or .txt).",
-        type=str,
-        metavar="FILE",
-    )
 
     parser_upload = subparsers.add_parser(
         "upload",

esphome/analyze_memory/cli.py

@@ -1,7 +1,6 @@
 """CLI interface for memory analysis with report generation."""
 
 from collections import defaultdict
-import json
 import sys
 
 from . import (
@@ -284,28 +283,6 @@ class MemoryAnalyzerCLI(MemoryAnalyzer):
 
         return "\n".join(lines)
 
-    def to_json(self) -> str:
-        """Export analysis results as JSON."""
-        data = {
-            "components": {
-                name: {
-                    "text": mem.text_size,
-                    "rodata": mem.rodata_size,
-                    "data": mem.data_size,
-                    "bss": mem.bss_size,
-                    "flash_total": mem.flash_total,
-                    "ram_total": mem.ram_total,
-                    "symbol_count": mem.symbol_count,
-                }
-                for name, mem in self.components.items()
-            },
-            "totals": {
-                "flash": sum(c.flash_total for c in self.components.values()),
-                "ram": sum(c.ram_total for c in self.components.values()),
-            },
-        }
-        return json.dumps(data, indent=2)
-
     def dump_uncategorized_symbols(self, output_file: str | None = None) -> None:
         """Dump uncategorized symbols for analysis."""
         # Sort by size descending

esphome/automation.py

@@ -92,7 +92,6 @@ def validate_potentially_or_condition(value):
 
 DelayAction = cg.esphome_ns.class_("DelayAction", Action, cg.Component)
 LambdaAction = cg.esphome_ns.class_("LambdaAction", Action)
-StatelessLambdaAction = cg.esphome_ns.class_("StatelessLambdaAction", Action)
 IfAction = cg.esphome_ns.class_("IfAction", Action)
 WhileAction = cg.esphome_ns.class_("WhileAction", Action)
 RepeatAction = cg.esphome_ns.class_("RepeatAction", Action)
@@ -103,7 +102,6 @@ ResumeComponentAction = cg.esphome_ns.class_("ResumeComponentAction", Action)
 Automation = cg.esphome_ns.class_("Automation")
 
 LambdaCondition = cg.esphome_ns.class_("LambdaCondition", Condition)
-StatelessLambdaCondition = cg.esphome_ns.class_("StatelessLambdaCondition", Condition)
 ForCondition = cg.esphome_ns.class_("ForCondition", Condition, cg.Component)
 
 
@@ -277,9 +275,7 @@ async def lambda_condition_to_code(
     args: TemplateArgsType,
 ) -> MockObj:
     lambda_ = await cg.process_lambda(config, args, return_type=bool)
-    return new_lambda_pvariable(
-        condition_id, lambda_, StatelessLambdaCondition, template_arg
-    )
+    return cg.new_Pvariable(condition_id, template_arg, lambda_)
 
 
 @register_condition(
@@ -445,7 +441,7 @@ async def lambda_action_to_code(
     args: TemplateArgsType,
 ) -> MockObj:
     lambda_ = await cg.process_lambda(config, args, return_type=cg.void)
-    return new_lambda_pvariable(action_id, lambda_, StatelessLambdaAction, template_arg)
+    return cg.new_Pvariable(action_id, template_arg, lambda_)
 
 
 @register_action(

esphome/codegen.py

@@ -62,7 +62,6 @@ from esphome.cpp_types import (  # noqa: F401
     EntityBase,
     EntityCategory,
     ESPTime,
-    FixedVector,
     GPIOPin,
     InternalGPIOPin,
     JsonObject,

esphome/components/api/__init__.py

@@ -71,12 +71,10 @@ SERVICE_ARG_NATIVE_TYPES = {
     "int": cg.int32,
     "float": float,
     "string": cg.std_string,
-    "bool[]": cg.FixedVector.template(bool).operator("const").operator("ref"),
-    "int[]": cg.FixedVector.template(cg.int32).operator("const").operator("ref"),
-    "float[]": cg.FixedVector.template(float).operator("const").operator("ref"),
-    "string[]": cg.FixedVector.template(cg.std_string)
-    .operator("const")
-    .operator("ref"),
+    "bool[]": cg.std_vector.template(bool),
+    "int[]": cg.std_vector.template(cg.int32),
+    "float[]": cg.std_vector.template(float),
+    "string[]": cg.std_vector.template(cg.std_string),
 }
 CONF_ENCRYPTION = "encryption"
 CONF_BATCH_DELAY = "batch_delay"
@@ -260,10 +258,6 @@ async def to_code(config):
     if config.get(CONF_ACTIONS) or config[CONF_CUSTOM_SERVICES]:
         cg.add_define("USE_API_SERVICES")
 
-    # Set USE_API_CUSTOM_SERVICES if external components need dynamic service registration
-    if config[CONF_CUSTOM_SERVICES]:
-        cg.add_define("USE_API_CUSTOM_SERVICES")
-
     if config[CONF_HOMEASSISTANT_SERVICES]:
         cg.add_define("USE_API_HOMEASSISTANT_SERVICES")
 
@@ -271,8 +265,6 @@ async def to_code(config):
         cg.add_define("USE_API_HOMEASSISTANT_STATES")
 
     if actions := config.get(CONF_ACTIONS, []):
-        # Collect all triggers first, then register all at once with initializer_list
-        triggers: list[cg.Pvariable] = []
         for conf in actions:
             template_args = []
             func_args = []
@@ -286,10 +278,8 @@ async def to_code(config):
             trigger = cg.new_Pvariable(
                 conf[CONF_TRIGGER_ID], templ, conf[CONF_ACTION], service_arg_names
             )
-            triggers.append(trigger)
+            cg.add(var.register_user_service(trigger))
             await automation.build_automation(trigger, func_args, conf)
-        # Register all services at once - single allocation, no reallocations
-        cg.add(var.initialize_user_services(triggers))
 
     if CONF_ON_CLIENT_CONNECTED in config:
         cg.add_define("USE_API_CLIENT_CONNECTED_TRIGGER")

esphome/components/api/api.proto

@@ -425,7 +425,7 @@ message ListEntitiesFanResponse {
   bool disabled_by_default = 9;
   string icon = 10 [(field_ifdef) = "USE_ENTITY_ICON"];
   EntityCategory entity_category = 11;
-  repeated string supported_preset_modes = 12 [(container_pointer) = "std::vector"];
+  repeated string supported_preset_modes = 12 [(container_pointer) = "std::set"];
   uint32 device_id = 13 [(field_ifdef) = "USE_DEVICES"];
 }
 // Deprecated in API version 1.6 - only used in deprecated fields
@@ -989,7 +989,7 @@ message ListEntitiesClimateResponse {
 
   bool supports_current_temperature = 5; // Deprecated: use feature_flags
   bool supports_two_point_target_temperature = 6; // Deprecated: use feature_flags
-  repeated ClimateMode supported_modes = 7 [(container_pointer_no_template) = "climate::ClimateModeMask"];
+  repeated ClimateMode supported_modes = 7 [(container_pointer) = "std::set<climate::ClimateMode>"];
   float visual_min_temperature = 8;
   float visual_max_temperature = 9;
   float visual_target_temperature_step = 10;
@@ -998,11 +998,11 @@ message ListEntitiesClimateResponse {
   // Deprecated in API version 1.5
   bool legacy_supports_away = 11 [deprecated=true];
   bool supports_action = 12; // Deprecated: use feature_flags
-  repeated ClimateFanMode supported_fan_modes = 13 [(container_pointer_no_template) = "climate::ClimateFanModeMask"];
-  repeated ClimateSwingMode supported_swing_modes = 14 [(container_pointer_no_template) = "climate::ClimateSwingModeMask"];
-  repeated string supported_custom_fan_modes = 15 [(container_pointer) = "std::vector"];
-  repeated ClimatePreset supported_presets = 16 [(container_pointer_no_template) = "climate::ClimatePresetMask"];
-  repeated string supported_custom_presets = 17 [(container_pointer) = "std::vector"];
+  repeated ClimateFanMode supported_fan_modes = 13 [(container_pointer) = "std::set<climate::ClimateFanMode>"];
+  repeated ClimateSwingMode supported_swing_modes = 14 [(container_pointer) = "std::set<climate::ClimateSwingMode>"];
+  repeated string supported_custom_fan_modes = 15 [(container_pointer) = "std::set"];
+  repeated ClimatePreset supported_presets = 16 [(container_pointer) = "std::set<climate::ClimatePreset>"];
+  repeated string supported_custom_presets = 17 [(container_pointer) = "std::set"];
   bool disabled_by_default = 18;
   string icon = 19 [(field_ifdef) = "USE_ENTITY_ICON"];
   EntityCategory entity_category = 20;
@@ -1143,7 +1143,7 @@ message ListEntitiesSelectResponse {
   reserved 4; // Deprecated: was string unique_id
 
   string icon = 5 [(field_ifdef) = "USE_ENTITY_ICON"];
-  repeated string options = 6 [(container_pointer_no_template) = "FixedVector<const char *>"];
+  repeated string options = 6 [(container_pointer) = "std::vector"];
   bool disabled_by_default = 7;
   EntityCategory entity_category = 8;
   uint32 device_id = 9 [(field_ifdef) = "USE_DEVICES"];

esphome/components/api/api_connection.cpp

@@ -669,18 +669,18 @@ uint16_t APIConnection::try_send_climate_info(EntityBase *entity, APIConnection
   msg.supports_action = traits.has_feature_flags(climate::CLIMATE_SUPPORTS_ACTION);
   // Current feature flags and other supported parameters
   msg.feature_flags = traits.get_feature_flags();
-  msg.supported_modes = &traits.get_supported_modes();
+  msg.supported_modes = &traits.get_supported_modes_for_api_();
   msg.visual_min_temperature = traits.get_visual_min_temperature();
   msg.visual_max_temperature = traits.get_visual_max_temperature();
   msg.visual_target_temperature_step = traits.get_visual_target_temperature_step();
   msg.visual_current_temperature_step = traits.get_visual_current_temperature_step();
   msg.visual_min_humidity = traits.get_visual_min_humidity();
   msg.visual_max_humidity = traits.get_visual_max_humidity();
-  msg.supported_fan_modes = &traits.get_supported_fan_modes();
-  msg.supported_custom_fan_modes = &traits.get_supported_custom_fan_modes();
-  msg.supported_presets = &traits.get_supported_presets();
-  msg.supported_custom_presets = &traits.get_supported_custom_presets();
-  msg.supported_swing_modes = &traits.get_supported_swing_modes();
+  msg.supported_fan_modes = &traits.get_supported_fan_modes_for_api_();
+  msg.supported_custom_fan_modes = &traits.get_supported_custom_fan_modes_for_api_();
+  msg.supported_presets = &traits.get_supported_presets_for_api_();
+  msg.supported_custom_presets = &traits.get_supported_custom_presets_for_api_();
+  msg.supported_swing_modes = &traits.get_supported_swing_modes_for_api_();
   return fill_and_encode_entity_info(climate, msg, ListEntitiesClimateResponse::MESSAGE_TYPE, conn, remaining_size,
                                      is_single);
 }

esphome/components/api/api_frame_helper_noise.cpp

@@ -142,11 +142,6 @@ APIError APINoiseFrameHelper::loop() {
  * errno API_ERROR_HANDSHAKE_PACKET_LEN: Packet too big for this phase.
  */
 APIError APINoiseFrameHelper::try_read_frame_() {
-  // Clear buffer when starting a new frame (rx_buf_len_ == 0 means not resuming after WOULD_BLOCK)
-  if (this->rx_buf_len_ == 0) {
-    this->rx_buf_.clear();
-  }
-
   // read header
   if (rx_header_buf_len_ < 3) {
     // no header information yet

esphome/components/api/api_frame_helper_plaintext.cpp

@@ -54,11 +54,6 @@ APIError APIPlaintextFrameHelper::loop() {
  * error API_ERROR_BAD_INDICATOR: Bad indicator byte at start of frame.
  */
 APIError APIPlaintextFrameHelper::try_read_frame_() {
-  // Clear buffer when starting a new frame (rx_buf_len_ == 0 means not resuming after WOULD_BLOCK)
-  if (this->rx_buf_len_ == 0) {
-    this->rx_buf_.clear();
-  }
-
   // read header
   while (!rx_header_parsed_) {
     // Now that we know when the socket is ready, we can read up to 3 bytes

esphome/components/api/api_pb2.cpp

@@ -1475,8 +1475,8 @@ void ListEntitiesSelectResponse::encode(ProtoWriteBuffer buffer) const {
 #ifdef USE_ENTITY_ICON
   buffer.encode_string(5, this->icon_ref_);
 #endif
-  for (const char *it : *this->options) {
-    buffer.encode_string(6, it, strlen(it), true);
+  for (const auto &it : *this->options) {
+    buffer.encode_string(6, it, true);
   }
   buffer.encode_bool(7, this->disabled_by_default);
   buffer.encode_uint32(8, static_cast<uint32_t>(this->entity_category));
@@ -1492,8 +1492,8 @@ void ListEntitiesSelectResponse::calculate_size(ProtoSize &size) const {
   size.add_length(1, this->icon_ref_.size());
 #endif
   if (!this->options->empty()) {
-    for (const char *it : *this->options) {
-      size.add_length_force(1, strlen(it));
+    for (const auto &it : *this->options) {
+      size.add_length_force(1, it.size());
     }
   }
   size.add_bool(1, this->disabled_by_default);

esphome/components/api/api_pb2.h

@@ -725,7 +725,7 @@ class ListEntitiesFanResponse final : public InfoResponseProtoMessage {
   bool supports_speed{false};
   bool supports_direction{false};
   int32_t supported_speed_count{0};
-  const std::vector<std::string> *supported_preset_modes{};
+  const std::set<std::string> *supported_preset_modes{};
   void encode(ProtoWriteBuffer buffer) const override;
   void calculate_size(ProtoSize &size) const override;
 #ifdef HAS_PROTO_MESSAGE_DUMP
@@ -1377,16 +1377,16 @@ class ListEntitiesClimateResponse final : public InfoResponseProtoMessage {
 #endif
   bool supports_current_temperature{false};
   bool supports_two_point_target_temperature{false};
-  const climate::ClimateModeMask *supported_modes{};
+  const std::set<climate::ClimateMode> *supported_modes{};
   float visual_min_temperature{0.0f};
   float visual_max_temperature{0.0f};
   float visual_target_temperature_step{0.0f};
   bool supports_action{false};
-  const climate::ClimateFanModeMask *supported_fan_modes{};
-  const climate::ClimateSwingModeMask *supported_swing_modes{};
-  const std::vector<std::string> *supported_custom_fan_modes{};
-  const climate::ClimatePresetMask *supported_presets{};
-  const std::vector<std::string> *supported_custom_presets{};
+  const std::set<climate::ClimateFanMode> *supported_fan_modes{};
+  const std::set<climate::ClimateSwingMode> *supported_swing_modes{};
+  const std::set<std::string> *supported_custom_fan_modes{};
+  const std::set<climate::ClimatePreset> *supported_presets{};
+  const std::set<std::string> *supported_custom_presets{};
   float visual_current_temperature_step{0.0f};
   bool supports_current_humidity{false};
   bool supports_target_humidity{false};
@@ -1534,7 +1534,7 @@ class ListEntitiesSelectResponse final : public InfoResponseProtoMessage {
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "list_entities_select_response"; }
 #endif
-  const FixedVector<const char *> *options{};
+  const std::vector<std::string> *options{};
   void encode(ProtoWriteBuffer buffer) const override;
   void calculate_size(ProtoSize &size) const override;
 #ifdef HAS_PROTO_MESSAGE_DUMP

esphome/components/api/api_pb2_dump.cpp

@@ -88,12 +88,6 @@ static void dump_field(std::string &out, const char *field_name, StringRef value
   out.append("\n");
 }
 
-static void dump_field(std::string &out, const char *field_name, const char *value, int indent = 2) {
-  append_field_prefix(out, field_name, indent);
-  out.append("'").append(value).append("'");
-  out.append("\n");
-}
-
 template<typename T> static void dump_field(std::string &out, const char *field_name, T value, int indent = 2) {
   append_field_prefix(out, field_name, indent);
   out.append(proto_enum_to_string<T>(value));

esphome/components/api/api_server.h

@@ -125,14 +125,8 @@ class APIServer : public Component, public Controller {
 #endif  // USE_API_HOMEASSISTANT_ACTION_RESPONSES
 #endif  // USE_API_HOMEASSISTANT_SERVICES
 #ifdef USE_API_SERVICES
-  void initialize_user_services(std::initializer_list<UserServiceDescriptor *> services) {
-    this->user_services_.assign(services);
-  }
-#ifdef USE_API_CUSTOM_SERVICES
-  // Only compile push_back method when custom_services: true (external components)
   void register_user_service(UserServiceDescriptor *descriptor) { this->user_services_.push_back(descriptor); }
 #endif
-#endif
 #ifdef USE_HOMEASSISTANT_TIME
   void request_time();
 #endif

esphome/components/api/custom_api_device.h

@@ -53,14 +53,8 @@ class CustomAPIDevice {
   template<typename T, typename... Ts>
   void register_service(void (T::*callback)(Ts...), const std::string &name,
                         const std::array<std::string, sizeof...(Ts)> &arg_names) {
-#ifdef USE_API_CUSTOM_SERVICES
     auto *service = new CustomAPIDeviceService<T, Ts...>(name, arg_names, (T *) this, callback);  // NOLINT
     global_api_server->register_user_service(service);
-#else
-    static_assert(
-        sizeof(T) == 0,
-        "register_service() requires 'custom_services: true' in the 'api:' section of your YAML configuration");
-#endif
   }
 #else
   template<typename T, typename... Ts>
@@ -92,14 +86,8 @@ class CustomAPIDevice {
    */
 #ifdef USE_API_SERVICES
   template<typename T> void register_service(void (T::*callback)(), const std::string &name) {
-#ifdef USE_API_CUSTOM_SERVICES
     auto *service = new CustomAPIDeviceService<T>(name, {}, (T *) this, callback);  // NOLINT
     global_api_server->register_user_service(service);
-#else
-    static_assert(
-        sizeof(T) == 0,
-        "register_service() requires 'custom_services: true' in the 'api:' section of your YAML configuration");
-#endif
   }
 #else
   template<typename T> void register_service(void (T::*callback)(), const std::string &name) {

esphome/components/api/proto.h

@@ -7,7 +7,6 @@
 
 #include <cassert>
 #include <cstring>
-#include <type_traits>
 #include <vector>
 
 #ifdef ESPHOME_LOG_HAS_VERY_VERBOSE
@@ -160,6 +159,22 @@ class ProtoVarInt {
       }
     }
   }
+  void encode(std::vector<uint8_t> &out) {
+    uint64_t val = this->value_;
+    if (val <= 0x7F) {
+      out.push_back(val);
+      return;
+    }
+    while (val) {
+      uint8_t temp = val & 0x7F;
+      val >>= 7;
+      if (val) {
+        out.push_back(temp | 0x80);
+      } else {
+        out.push_back(temp);
+      }
+    }
+  }
 
  protected:
   uint64_t value_;
@@ -218,86 +233,8 @@ class ProtoWriteBuffer {
  public:
   ProtoWriteBuffer(std::vector<uint8_t> *buffer) : buffer_(buffer) {}
   void write(uint8_t value) { this->buffer_->push_back(value); }
-
-  // Single implementation that all overloads delegate to
-  void encode_varint(uint64_t value) {
-    auto buffer = this->buffer_;
-    size_t start = buffer->size();
-
-    // Fast paths for common cases (1-3 bytes)
-    if (value < (1ULL << 7)) {
-      // 1 byte - very common for field IDs and small lengths
-      buffer->resize(start + 1);
-      buffer->data()[start] = static_cast<uint8_t>(value);
-      return;
-    }
-
-    uint8_t *p;
-    if (value < (1ULL << 14)) {
-      // 2 bytes - common for medium field IDs and lengths
-      buffer->resize(start + 2);
-      p = buffer->data() + start;
-      p[0] = (value & 0x7F) | 0x80;
-      p[1] = (value >> 7) & 0x7F;
-      return;
-    }
-    if (value < (1ULL << 21)) {
-      // 3 bytes - rare
-      buffer->resize(start + 3);
-      p = buffer->data() + start;
-      p[0] = (value & 0x7F) | 0x80;
-      p[1] = ((value >> 7) & 0x7F) | 0x80;
-      p[2] = (value >> 14) & 0x7F;
-      return;
-    }
-
-    // Rare case: 4-10 byte values - calculate size from bit position
-    // Value is guaranteed >= (1ULL << 21), so CLZ is safe (non-zero)
-    uint32_t size;
-#if defined(__GNUC__) || defined(__clang__)
-    // Use compiler intrinsic for efficient bit position lookup
-    size = (64 - __builtin_clzll(value) + 6) / 7;
-#else
-    // Fallback for compilers without __builtin_clzll
-    if (value < (1ULL << 28)) {
-      size = 4;
-    } else if (value < (1ULL << 35)) {
-      size = 5;
-    } else if (value < (1ULL << 42)) {
-      size = 6;
-    } else if (value < (1ULL << 49)) {
-      size = 7;
-    } else if (value < (1ULL << 56)) {
-      size = 8;
-    } else if (value < (1ULL << 63)) {
-      size = 9;
-    } else {
-      size = 10;
-    }
-#endif
-
-    buffer->resize(start + size);
-    p = buffer->data() + start;
-    size_t bytes = 0;
-    while (value) {
-      uint8_t temp = value & 0x7F;
-      value >>= 7;
-      p[bytes++] = value ? temp | 0x80 : temp;
-    }
-  }
-
-  // Common case: uint32_t values (field IDs, lengths, most integers)
-  void encode_varint(uint32_t value) { this->encode_varint(static_cast<uint64_t>(value)); }
-
-  // size_t overload (only enabled if size_t is distinct from uint32_t and uint64_t)
-  template<typename T>
-  void encode_varint(T value) requires(std::is_same_v<T, size_t> && !std::is_same_v<size_t, uint32_t> &&
-                                       !std::is_same_v<size_t, uint64_t>) {
-    this->encode_varint(static_cast<uint64_t>(value));
-  }
-
-  // Rare case: ProtoVarInt wrapper
-  void encode_varint(ProtoVarInt value) { this->encode_varint(value.as_uint64()); }
+  void encode_varint_raw(ProtoVarInt value) { value.encode(*this->buffer_); }
+  void encode_varint_raw(uint32_t value) { this->encode_varint_raw(ProtoVarInt(value)); }
   /**
    * Encode a field key (tag/wire type combination).
    *
@@ -312,14 +249,14 @@ class ProtoWriteBuffer {
    */
   void encode_field_raw(uint32_t field_id, uint32_t type) {
     uint32_t val = (field_id << 3) | (type & WIRE_TYPE_MASK);
-    this->encode_varint(val);
+    this->encode_varint_raw(val);
   }
   void encode_string(uint32_t field_id, const char *string, size_t len, bool force = false) {
     if (len == 0 && !force)
       return;
 
     this->encode_field_raw(field_id, 2);  // type 2: Length-delimited string
-    this->encode_varint(len);
+    this->encode_varint_raw(len);
 
     // Using resize + memcpy instead of insert provides significant performance improvement:
     // ~10-11x faster for 16-32 byte strings, ~3x faster for 64-byte strings
@@ -341,13 +278,13 @@ class ProtoWriteBuffer {
     if (value == 0 && !force)
       return;
     this->encode_field_raw(field_id, 0);  // type 0: Varint - uint32
-    this->encode_varint(value);
+    this->encode_varint_raw(value);
   }
   void encode_uint64(uint32_t field_id, uint64_t value, bool force = false) {
     if (value == 0 && !force)
       return;
     this->encode_field_raw(field_id, 0);  // type 0: Varint - uint64
-    this->encode_varint(value);
+    this->encode_varint_raw(ProtoVarInt(value));
   }
   void encode_bool(uint32_t field_id, bool value, bool force = false) {
     if (!value && !force)

esphome/components/api/user_services.cpp

@@ -11,58 +11,23 @@ template<> int32_t get_execute_arg_value<int32_t>(const ExecuteServiceArgument &
 }
 template<> float get_execute_arg_value<float>(const ExecuteServiceArgument &arg) { return arg.float_; }
 template<> std::string get_execute_arg_value<std::string>(const ExecuteServiceArgument &arg) { return arg.string_; }
-
-// Legacy std::vector versions for external components using custom_api_device.h - optimized with reserve
 template<> std::vector<bool> get_execute_arg_value<std::vector<bool>>(const ExecuteServiceArgument &arg) {
-  std::vector<bool> result;
-  result.reserve(arg.bool_array.size());
-  result.insert(result.end(), arg.bool_array.begin(), arg.bool_array.end());
-  return result;
+  return std::vector<bool>(arg.bool_array.begin(), arg.bool_array.end());
 }
 template<> std::vector<int32_t> get_execute_arg_value<std::vector<int32_t>>(const ExecuteServiceArgument &arg) {
-  std::vector<int32_t> result;
-  result.reserve(arg.int_array.size());
-  result.insert(result.end(), arg.int_array.begin(), arg.int_array.end());
-  return result;
+  return std::vector<int32_t>(arg.int_array.begin(), arg.int_array.end());
 }
 template<> std::vector<float> get_execute_arg_value<std::vector<float>>(const ExecuteServiceArgument &arg) {
-  std::vector<float> result;
-  result.reserve(arg.float_array.size());
-  result.insert(result.end(), arg.float_array.begin(), arg.float_array.end());
-  return result;
+  return std::vector<float>(arg.float_array.begin(), arg.float_array.end());
 }
 template<> std::vector<std::string> get_execute_arg_value<std::vector<std::string>>(const ExecuteServiceArgument &arg) {
-  std::vector<std::string> result;
-  result.reserve(arg.string_array.size());
-  result.insert(result.end(), arg.string_array.begin(), arg.string_array.end());
-  return result;
-}
-
-// New FixedVector const reference versions for YAML-generated services - zero-copy
-template<>
-const FixedVector<bool> &get_execute_arg_value<const FixedVector<bool> &>(const ExecuteServiceArgument &arg) {
-  return arg.bool_array;
-}
-template<>
-const FixedVector<int32_t> &get_execute_arg_value<const FixedVector<int32_t> &>(const ExecuteServiceArgument &arg) {
-  return arg.int_array;
-}
-template<>
-const FixedVector<float> &get_execute_arg_value<const FixedVector<float> &>(const ExecuteServiceArgument &arg) {
-  return arg.float_array;
-}
-template<>
-const FixedVector<std::string> &get_execute_arg_value<const FixedVector<std::string> &>(
-    const ExecuteServiceArgument &arg) {
-  return arg.string_array;
+  return std::vector<std::string>(arg.string_array.begin(), arg.string_array.end());
 }
 
 template<> enums::ServiceArgType to_service_arg_type<bool>() { return enums::SERVICE_ARG_TYPE_BOOL; }
 template<> enums::ServiceArgType to_service_arg_type<int32_t>() { return enums::SERVICE_ARG_TYPE_INT; }
 template<> enums::ServiceArgType to_service_arg_type<float>() { return enums::SERVICE_ARG_TYPE_FLOAT; }
 template<> enums::ServiceArgType to_service_arg_type<std::string>() { return enums::SERVICE_ARG_TYPE_STRING; }
-
-// Legacy std::vector versions for external components using custom_api_device.h
 template<> enums::ServiceArgType to_service_arg_type<std::vector<bool>>() { return enums::SERVICE_ARG_TYPE_BOOL_ARRAY; }
 template<> enums::ServiceArgType to_service_arg_type<std::vector<int32_t>>() {
   return enums::SERVICE_ARG_TYPE_INT_ARRAY;
@@ -74,18 +39,4 @@ template<> enums::ServiceArgType to_service_arg_type<std::vector<std::string>>()
   return enums::SERVICE_ARG_TYPE_STRING_ARRAY;
 }
 
-// New FixedVector const reference versions for YAML-generated services
-template<> enums::ServiceArgType to_service_arg_type<const FixedVector<bool> &>() {
-  return enums::SERVICE_ARG_TYPE_BOOL_ARRAY;
-}
-template<> enums::ServiceArgType to_service_arg_type<const FixedVector<int32_t> &>() {
-  return enums::SERVICE_ARG_TYPE_INT_ARRAY;
-}
-template<> enums::ServiceArgType to_service_arg_type<const FixedVector<float> &>() {
-  return enums::SERVICE_ARG_TYPE_FLOAT_ARRAY;
-}
-template<> enums::ServiceArgType to_service_arg_type<const FixedVector<std::string> &>() {
-  return enums::SERVICE_ARG_TYPE_STRING_ARRAY;
-}
-
 }  // namespace esphome::api

esphome/components/bedjet/bedjet_const.h

@@ -99,8 +99,9 @@ enum BedjetCommand : uint8_t {
 
 static const uint8_t BEDJET_FAN_SPEED_COUNT = 20;
 
-static constexpr const char *const BEDJET_FAN_STEP_NAMES[BEDJET_FAN_SPEED_COUNT] = BEDJET_FAN_STEP_NAMES_;
+static const char *const BEDJET_FAN_STEP_NAMES[BEDJET_FAN_SPEED_COUNT] = BEDJET_FAN_STEP_NAMES_;
 static const std::string BEDJET_FAN_STEP_NAME_STRINGS[BEDJET_FAN_SPEED_COUNT] = BEDJET_FAN_STEP_NAMES_;
+static const std::set<std::string> BEDJET_FAN_STEP_NAMES_SET BEDJET_FAN_STEP_NAMES_;
 
 }  // namespace bedjet
 }  // namespace esphome

esphome/components/bedjet/climate/bedjet_climate.h

@@ -43,7 +43,7 @@ class BedJetClimate : public climate::Climate, public BedJetClient, public Polli
     });
 
     // It would be better if we had a slider for the fan modes.
-    traits.set_supported_custom_fan_modes(BEDJET_FAN_STEP_NAMES);
+    traits.set_supported_custom_fan_modes(BEDJET_FAN_STEP_NAMES_SET);
     traits.set_supported_presets({
         // If we support NONE, then have to decide what happens if the user switches to it (turn off?)
         // climate::CLIMATE_PRESET_NONE,

esphome/components/binary_sensor/__init__.py

@@ -155,7 +155,6 @@ DelayedOffFilter = binary_sensor_ns.class_("DelayedOffFilter", Filter, cg.Compon
 InvertFilter = binary_sensor_ns.class_("InvertFilter", Filter)
 AutorepeatFilter = binary_sensor_ns.class_("AutorepeatFilter", Filter, cg.Component)
 LambdaFilter = binary_sensor_ns.class_("LambdaFilter", Filter)
-StatelessLambdaFilter = binary_sensor_ns.class_("StatelessLambdaFilter", Filter)
 SettleFilter = binary_sensor_ns.class_("SettleFilter", Filter, cg.Component)
 
 _LOGGER = getLogger(__name__)
@@ -300,7 +299,7 @@ async def lambda_filter_to_code(config, filter_id):
     lambda_ = await cg.process_lambda(
         config, [(bool, "x")], return_type=cg.optional.template(bool)
     )
-    return automation.new_lambda_pvariable(filter_id, lambda_, StatelessLambdaFilter)
+    return cg.new_Pvariable(filter_id, lambda_)
 
 
 @register_filter(

esphome/components/binary_sensor/filter.h

@@ -111,21 +111,6 @@ class LambdaFilter : public Filter {
   std::function<optional<bool>(bool)> f_;
 };
 
-/** Optimized lambda filter for stateless lambdas (no capture).
- *
- * Uses function pointer instead of std::function to reduce memory overhead.
- * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function).
- */
-class StatelessLambdaFilter : public Filter {
- public:
-  explicit StatelessLambdaFilter(optional<bool> (*f)(bool)) : f_(f) {}
-
-  optional<bool> new_value(bool value) override { return this->f_(value); }
-
- protected:
-  optional<bool> (*f_)(bool);
-};
-
 class SettleFilter : public Filter, public Component {
  public:
   optional<bool> new_value(bool value) override;

esphome/components/ble_client/automation.h

@@ -96,11 +96,8 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
   BLEClientWriteAction(BLEClient *ble_client) {
     ble_client->register_ble_node(this);
     ble_client_ = ble_client;
-    this->construct_simple_value_();
   }
 
-  ~BLEClientWriteAction() { this->destroy_simple_value_(); }
-
   void set_service_uuid16(uint16_t uuid) { this->service_uuid_ = espbt::ESPBTUUID::from_uint16(uuid); }
   void set_service_uuid32(uint32_t uuid) { this->service_uuid_ = espbt::ESPBTUUID::from_uint32(uuid); }
   void set_service_uuid128(uint8_t *uuid) { this->service_uuid_ = espbt::ESPBTUUID::from_raw(uuid); }
@@ -109,18 +106,14 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
   void set_char_uuid32(uint32_t uuid) { this->char_uuid_ = espbt::ESPBTUUID::from_uint32(uuid); }
   void set_char_uuid128(uint8_t *uuid) { this->char_uuid_ = espbt::ESPBTUUID::from_raw(uuid); }
 
-  void set_value_template(std::vector<uint8_t> (*func)(Ts...)) {
-    this->destroy_simple_value_();
-    this->value_.template_func = func;
-    this->has_simple_value_ = false;
+  void set_value_template(std::function<std::vector<uint8_t>(Ts...)> func) {
+    this->value_template_ = std::move(func);
+    has_simple_value_ = false;
   }
 
   void set_value_simple(const std::vector<uint8_t> &value) {
-    if (!this->has_simple_value_) {
-      this->construct_simple_value_();
-    }
-    this->value_.simple = value;
-    this->has_simple_value_ = true;
+    this->value_simple_ = value;
+    has_simple_value_ = true;
   }
 
   void play(Ts... x) override {}
@@ -128,7 +121,7 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
   void play_complex(Ts... x) override {
     this->num_running_++;
     this->var_ = std::make_tuple(x...);
-    auto value = this->has_simple_value_ ? this->value_.simple : this->value_.template_func(x...);
+    auto value = this->has_simple_value_ ? this->value_simple_ : this->value_template_(x...);
     // on write failure, continue the automation chain rather than stopping so that e.g. disconnect can work.
     if (!write(value))
       this->play_next_(x...);
@@ -201,22 +194,10 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
   }
 
  private:
-  void construct_simple_value_() { new (&this->value_.simple) std::vector<uint8_t>(); }
-
-  void destroy_simple_value_() {
-    if (this->has_simple_value_) {
-      this->value_.simple.~vector();
-    }
-  }
-
   BLEClient *ble_client_;
   bool has_simple_value_ = true;
-  union Value {
-    std::vector<uint8_t> simple;
-    std::vector<uint8_t> (*template_func)(Ts...);
-    Value() {}   // trivial constructor
-    ~Value() {}  // trivial destructor - we manage lifetime via discriminator
-  } value_;
+  std::vector<uint8_t> value_simple_;
+  std::function<std::vector<uint8_t>(Ts...)> value_template_{};
   espbt::ESPBTUUID service_uuid_;
   espbt::ESPBTUUID char_uuid_;
   std::tuple<Ts...> var_{};
@@ -232,9 +213,9 @@ template<typename... Ts> class BLEClientPasskeyReplyAction : public Action<Ts...
   void play(Ts... x) override {
     uint32_t passkey;
     if (has_simple_value_) {
-      passkey = this->value_.simple;
+      passkey = this->value_simple_;
     } else {
-      passkey = this->value_.template_func(x...);
+      passkey = this->value_template_(x...);
     }
     if (passkey > 999999)
       return;
@@ -243,23 +224,21 @@ template<typename... Ts> class BLEClientPasskeyReplyAction : public Action<Ts...
     esp_ble_passkey_reply(remote_bda, true, passkey);
   }
 
-  void set_value_template(uint32_t (*func)(Ts...)) {
-    this->value_.template_func = func;
-    this->has_simple_value_ = false;
+  void set_value_template(std::function<uint32_t(Ts...)> func) {
+    this->value_template_ = std::move(func);
+    has_simple_value_ = false;
   }
 
   void set_value_simple(const uint32_t &value) {
-    this->value_.simple = value;
-    this->has_simple_value_ = true;
+    this->value_simple_ = value;
+    has_simple_value_ = true;
   }
 
  private:
   BLEClient *parent_{nullptr};
   bool has_simple_value_ = true;
-  union {
-    uint32_t simple;
-    uint32_t (*template_func)(Ts...);
-  } value_{.simple = 0};
+  uint32_t value_simple_{0};
+  std::function<uint32_t(Ts...)> value_template_{};
 };
 
 template<typename... Ts> class BLEClientNumericComparisonReplyAction : public Action<Ts...> {
@@ -270,29 +249,27 @@ template<typename... Ts> class BLEClientNumericComparisonReplyAction : public Ac
     esp_bd_addr_t remote_bda;
     memcpy(remote_bda, parent_->get_remote_bda(), sizeof(esp_bd_addr_t));
     if (has_simple_value_) {
-      esp_ble_confirm_reply(remote_bda, this->value_.simple);
+      esp_ble_confirm_reply(remote_bda, this->value_simple_);
     } else {
-      esp_ble_confirm_reply(remote_bda, this->value_.template_func(x...));
+      esp_ble_confirm_reply(remote_bda, this->value_template_(x...));
     }
   }
 
-  void set_value_template(bool (*func)(Ts...)) {
-    this->value_.template_func = func;
-    this->has_simple_value_ = false;
+  void set_value_template(std::function<bool(Ts...)> func) {
+    this->value_template_ = std::move(func);
+    has_simple_value_ = false;
   }
 
   void set_value_simple(const bool &value) {
-    this->value_.simple = value;
-    this->has_simple_value_ = true;
+    this->value_simple_ = value;
+    has_simple_value_ = true;
   }
 
  private:
   BLEClient *parent_{nullptr};
   bool has_simple_value_ = true;
-  union {
-    bool simple;
-    bool (*template_func)(Ts...);
-  } value_{.simple = false};
+  bool value_simple_{false};
+  std::function<bool(Ts...)> value_template_{};
 };
 
 template<typename... Ts> class BLEClientRemoveBondAction : public Action<Ts...> {

esphome/components/ble_client/sensor/ble_sensor.cpp

@@ -117,9 +117,9 @@ void BLESensor::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t ga
 }
 
 float BLESensor::parse_data_(uint8_t *value, uint16_t value_len) {
-  if (this->has_data_to_value_) {
+  if (this->data_to_value_func_.has_value()) {
     std::vector<uint8_t> data(value, value + value_len);
-    return this->data_to_value_func_(data);
+    return (*this->data_to_value_func_)(data);
   } else {
     return value[0];
   }

esphome/components/ble_client/sensor/ble_sensor.h

@@ -15,6 +15,8 @@ namespace ble_client {
 
 namespace espbt = esphome::esp32_ble_tracker;
 
+using data_to_value_t = std::function<float(std::vector<uint8_t>)>;
+
 class BLESensor : public sensor::Sensor, public PollingComponent, public BLEClientNode {
  public:
   void loop() override;
@@ -31,17 +33,13 @@ class BLESensor : public sensor::Sensor, public PollingComponent, public BLEClie
   void set_descr_uuid16(uint16_t uuid) { this->descr_uuid_ = espbt::ESPBTUUID::from_uint16(uuid); }
   void set_descr_uuid32(uint32_t uuid) { this->descr_uuid_ = espbt::ESPBTUUID::from_uint32(uuid); }
   void set_descr_uuid128(uint8_t *uuid) { this->descr_uuid_ = espbt::ESPBTUUID::from_raw(uuid); }
-  void set_data_to_value(float (*lambda)(const std::vector<uint8_t> &)) {
-    this->data_to_value_func_ = lambda;
-    this->has_data_to_value_ = true;
-  }
+  void set_data_to_value(data_to_value_t &&lambda) { this->data_to_value_func_ = lambda; }
   void set_enable_notify(bool notify) { this->notify_ = notify; }
   uint16_t handle;
 
  protected:
   float parse_data_(uint8_t *value, uint16_t value_len);
-  bool has_data_to_value_{false};
-  float (*data_to_value_func_)(const std::vector<uint8_t> &){};
+  optional<data_to_value_t> data_to_value_func_{};
   bool notify_;
   espbt::ESPBTUUID service_uuid_;
   espbt::ESPBTUUID char_uuid_;

esphome/components/climate/climate.cpp

@@ -385,7 +385,7 @@ void Climate::save_state_() {
   if (!traits.get_supported_custom_fan_modes().empty() && custom_fan_mode.has_value()) {
     state.uses_custom_fan_mode = true;
     const auto &supported = traits.get_supported_custom_fan_modes();
-    // std::vector maintains insertion order
+    // std::set has consistent order (lexicographic for strings)
     size_t i = 0;
     for (const auto &mode : supported) {
       if (mode == custom_fan_mode) {
@@ -402,7 +402,7 @@ void Climate::save_state_() {
   if (!traits.get_supported_custom_presets().empty() && custom_preset.has_value()) {
     state.uses_custom_preset = true;
     const auto &supported = traits.get_supported_custom_presets();
-    // std::vector maintains insertion order
+    // std::set has consistent order (lexicographic for strings)
     size_t i = 0;
     for (const auto &preset : supported) {
       if (preset == custom_preset) {

esphome/components/climate/climate_mode.h

@@ -7,7 +7,6 @@ namespace esphome {
 namespace climate {
 
 /// Enum for all modes a climate device can be in.
-/// NOTE: If adding values, update ClimateModeMask in climate_traits.h to use the new last value
 enum ClimateMode : uint8_t {
   /// The climate device is off
   CLIMATE_MODE_OFF = 0,
@@ -25,7 +24,7 @@ enum ClimateMode : uint8_t {
    * For example, the target temperature can be adjusted based on a schedule, or learned behavior.
    * The target temperature can't be adjusted when in this mode.
    */
-  CLIMATE_MODE_AUTO = 6  // Update ClimateModeMask in climate_traits.h if adding values after this
+  CLIMATE_MODE_AUTO = 6
 };
 
 /// Enum for the current action of the climate device. Values match those of ClimateMode.
@@ -44,7 +43,6 @@ enum ClimateAction : uint8_t {
   CLIMATE_ACTION_FAN = 6,
 };
 
-/// NOTE: If adding values, update ClimateFanModeMask in climate_traits.h to use the new last value
 enum ClimateFanMode : uint8_t {
   /// The fan mode is set to On
   CLIMATE_FAN_ON = 0,
@@ -65,11 +63,10 @@ enum ClimateFanMode : uint8_t {
   /// The fan mode is set to Diffuse
   CLIMATE_FAN_DIFFUSE = 8,
   /// The fan mode is set to Quiet
-  CLIMATE_FAN_QUIET = 9,  // Update ClimateFanModeMask in climate_traits.h if adding values after this
+  CLIMATE_FAN_QUIET = 9,
 };
 
 /// Enum for all modes a climate swing can be in
-/// NOTE: If adding values, update ClimateSwingModeMask in climate_traits.h to use the new last value
 enum ClimateSwingMode : uint8_t {
   /// The swing mode is set to Off
   CLIMATE_SWING_OFF = 0,
@@ -78,11 +75,10 @@ enum ClimateSwingMode : uint8_t {
   /// The fan mode is set to Vertical
   CLIMATE_SWING_VERTICAL = 2,
   /// The fan mode is set to Horizontal
-  CLIMATE_SWING_HORIZONTAL = 3,  // Update ClimateSwingModeMask in climate_traits.h if adding values after this
+  CLIMATE_SWING_HORIZONTAL = 3,
 };
 
 /// Enum for all preset modes
-/// NOTE: If adding values, update ClimatePresetMask in climate_traits.h to use the new last value
 enum ClimatePreset : uint8_t {
   /// No preset is active
   CLIMATE_PRESET_NONE = 0,
@@ -99,7 +95,7 @@ enum ClimatePreset : uint8_t {
   /// Device is prepared for sleep
   CLIMATE_PRESET_SLEEP = 6,
   /// Device is reacting to activity (e.g., movement sensors)
-  CLIMATE_PRESET_ACTIVITY = 7,  // Update ClimatePresetMask in climate_traits.h if adding values after this
+  CLIMATE_PRESET_ACTIVITY = 7,
 };
 
 enum ClimateFeature : uint32_t {

esphome/components/climate/climate_traits.h

@@ -1,33 +1,19 @@
 #pragma once
 
-#include <vector>
+#include <set>
 #include "climate_mode.h"
-#include "esphome/core/finite_set_mask.h"
 #include "esphome/core/helpers.h"
 
 namespace esphome {
+
+#ifdef USE_API
+namespace api {
+class APIConnection;
+}  // namespace api
+#endif
+
 namespace climate {
 
-// Type aliases for climate enum bitmasks
-// These replace std::set<EnumType> to eliminate red-black tree overhead
-// For contiguous enums starting at 0, DefaultBitPolicy provides 1:1 mapping (enum value = bit position)
-// Bitmask size is automatically calculated from the last enum value
-using ClimateModeMask = FiniteSetMask<ClimateMode, DefaultBitPolicy<ClimateMode, CLIMATE_MODE_AUTO + 1>>;
-using ClimateFanModeMask = FiniteSetMask<ClimateFanMode, DefaultBitPolicy<ClimateFanMode, CLIMATE_FAN_QUIET + 1>>;
-using ClimateSwingModeMask =
-    FiniteSetMask<ClimateSwingMode, DefaultBitPolicy<ClimateSwingMode, CLIMATE_SWING_HORIZONTAL + 1>>;
-using ClimatePresetMask = FiniteSetMask<ClimatePreset, DefaultBitPolicy<ClimatePreset, CLIMATE_PRESET_ACTIVITY + 1>>;
-
-// Lightweight linear search for small vectors (1-20 items)
-// Avoids std::find template overhead
-template<typename T> inline bool vector_contains(const std::vector<T> &vec, const T &value) {
-  for (const auto &item : vec) {
-    if (item == value)
-      return true;
-  }
-  return false;
-}
-
 /** This class contains all static data for climate devices.
  *
  * All climate devices must support these features:
@@ -121,60 +107,48 @@ class ClimateTraits {
     }
   }
 
-  void set_supported_modes(ClimateModeMask modes) { this->supported_modes_ = modes; }
+  void set_supported_modes(std::set<ClimateMode> modes) { this->supported_modes_ = std::move(modes); }
   void add_supported_mode(ClimateMode mode) { this->supported_modes_.insert(mode); }
   bool supports_mode(ClimateMode mode) const { return this->supported_modes_.count(mode); }
-  const ClimateModeMask &get_supported_modes() const { return this->supported_modes_; }
+  const std::set<ClimateMode> &get_supported_modes() const { return this->supported_modes_; }
 
-  void set_supported_fan_modes(ClimateFanModeMask modes) { this->supported_fan_modes_ = modes; }
+  void set_supported_fan_modes(std::set<ClimateFanMode> modes) { this->supported_fan_modes_ = std::move(modes); }
   void add_supported_fan_mode(ClimateFanMode mode) { this->supported_fan_modes_.insert(mode); }
-  void add_supported_custom_fan_mode(const std::string &mode) { this->supported_custom_fan_modes_.push_back(mode); }
+  void add_supported_custom_fan_mode(const std::string &mode) { this->supported_custom_fan_modes_.insert(mode); }
   bool supports_fan_mode(ClimateFanMode fan_mode) const { return this->supported_fan_modes_.count(fan_mode); }
   bool get_supports_fan_modes() const {
     return !this->supported_fan_modes_.empty() || !this->supported_custom_fan_modes_.empty();
   }
-  const ClimateFanModeMask &get_supported_fan_modes() const { return this->supported_fan_modes_; }
+  const std::set<ClimateFanMode> &get_supported_fan_modes() const { return this->supported_fan_modes_; }
 
-  void set_supported_custom_fan_modes(std::vector<std::string> supported_custom_fan_modes) {
+  void set_supported_custom_fan_modes(std::set<std::string> supported_custom_fan_modes) {
     this->supported_custom_fan_modes_ = std::move(supported_custom_fan_modes);
   }
-  void set_supported_custom_fan_modes(std::initializer_list<std::string> modes) {
-    this->supported_custom_fan_modes_ = modes;
-  }
-  template<size_t N> void set_supported_custom_fan_modes(const char *const (&modes)[N]) {
-    this->supported_custom_fan_modes_.assign(modes, modes + N);
-  }
-  const std::vector<std::string> &get_supported_custom_fan_modes() const { return this->supported_custom_fan_modes_; }
+  const std::set<std::string> &get_supported_custom_fan_modes() const { return this->supported_custom_fan_modes_; }
   bool supports_custom_fan_mode(const std::string &custom_fan_mode) const {
-    return vector_contains(this->supported_custom_fan_modes_, custom_fan_mode);
+    return this->supported_custom_fan_modes_.count(custom_fan_mode);
   }
 
-  void set_supported_presets(ClimatePresetMask presets) { this->supported_presets_ = presets; }
+  void set_supported_presets(std::set<ClimatePreset> presets) { this->supported_presets_ = std::move(presets); }
   void add_supported_preset(ClimatePreset preset) { this->supported_presets_.insert(preset); }
-  void add_supported_custom_preset(const std::string &preset) { this->supported_custom_presets_.push_back(preset); }
+  void add_supported_custom_preset(const std::string &preset) { this->supported_custom_presets_.insert(preset); }
   bool supports_preset(ClimatePreset preset) const { return this->supported_presets_.count(preset); }
   bool get_supports_presets() const { return !this->supported_presets_.empty(); }
-  const ClimatePresetMask &get_supported_presets() const { return this->supported_presets_; }
+  const std::set<climate::ClimatePreset> &get_supported_presets() const { return this->supported_presets_; }
 
-  void set_supported_custom_presets(std::vector<std::string> supported_custom_presets) {
+  void set_supported_custom_presets(std::set<std::string> supported_custom_presets) {
     this->supported_custom_presets_ = std::move(supported_custom_presets);
   }
-  void set_supported_custom_presets(std::initializer_list<std::string> presets) {
-    this->supported_custom_presets_ = presets;
-  }
-  template<size_t N> void set_supported_custom_presets(const char *const (&presets)[N]) {
-    this->supported_custom_presets_.assign(presets, presets + N);
-  }
-  const std::vector<std::string> &get_supported_custom_presets() const { return this->supported_custom_presets_; }
+  const std::set<std::string> &get_supported_custom_presets() const { return this->supported_custom_presets_; }
   bool supports_custom_preset(const std::string &custom_preset) const {
-    return vector_contains(this->supported_custom_presets_, custom_preset);
+    return this->supported_custom_presets_.count(custom_preset);
   }
 
-  void set_supported_swing_modes(ClimateSwingModeMask modes) { this->supported_swing_modes_ = modes; }
+  void set_supported_swing_modes(std::set<ClimateSwingMode> modes) { this->supported_swing_modes_ = std::move(modes); }
   void add_supported_swing_mode(ClimateSwingMode mode) { this->supported_swing_modes_.insert(mode); }
   bool supports_swing_mode(ClimateSwingMode swing_mode) const { return this->supported_swing_modes_.count(swing_mode); }
   bool get_supports_swing_modes() const { return !this->supported_swing_modes_.empty(); }
-  const ClimateSwingModeMask &get_supported_swing_modes() const { return this->supported_swing_modes_; }
+  const std::set<ClimateSwingMode> &get_supported_swing_modes() const { return this->supported_swing_modes_; }
 
   float get_visual_min_temperature() const { return this->visual_min_temperature_; }
   void set_visual_min_temperature(float visual_min_temperature) {
@@ -205,6 +179,23 @@ class ClimateTraits {
   void set_visual_max_humidity(float visual_max_humidity) { this->visual_max_humidity_ = visual_max_humidity; }
 
  protected:
+#ifdef USE_API
+  // The API connection is a friend class to access internal methods
+  friend class api::APIConnection;
+  // These methods return references to internal data structures.
+  // They are used by the API to avoid copying data when encoding messages.
+  // Warning: Do not use these methods outside of the API connection code.
+  // They return references to internal data that can be invalidated.
+  const std::set<ClimateMode> &get_supported_modes_for_api_() const { return this->supported_modes_; }
+  const std::set<ClimateFanMode> &get_supported_fan_modes_for_api_() const { return this->supported_fan_modes_; }
+  const std::set<std::string> &get_supported_custom_fan_modes_for_api_() const {
+    return this->supported_custom_fan_modes_;
+  }
+  const std::set<climate::ClimatePreset> &get_supported_presets_for_api_() const { return this->supported_presets_; }
+  const std::set<std::string> &get_supported_custom_presets_for_api_() const { return this->supported_custom_presets_; }
+  const std::set<ClimateSwingMode> &get_supported_swing_modes_for_api_() const { return this->supported_swing_modes_; }
+#endif
+
   void set_mode_support_(climate::ClimateMode mode, bool supported) {
     if (supported) {
       this->supported_modes_.insert(mode);
@@ -235,12 +226,12 @@ class ClimateTraits {
   float visual_min_humidity_{30};
   float visual_max_humidity_{99};
 
-  climate::ClimateModeMask supported_modes_{climate::CLIMATE_MODE_OFF};
-  climate::ClimateFanModeMask supported_fan_modes_;
-  climate::ClimateSwingModeMask supported_swing_modes_;
-  climate::ClimatePresetMask supported_presets_;
-  std::vector<std::string> supported_custom_fan_modes_;
-  std::vector<std::string> supported_custom_presets_;
+  std::set<climate::ClimateMode> supported_modes_ = {climate::CLIMATE_MODE_OFF};
+  std::set<climate::ClimateFanMode> supported_fan_modes_;
+  std::set<climate::ClimateSwingMode> supported_swing_modes_;
+  std::set<climate::ClimatePreset> supported_presets_;
+  std::set<std::string> supported_custom_fan_modes_;
+  std::set<std::string> supported_custom_presets_;
 };
 
 }  // namespace climate

esphome/components/climate_ir/climate_ir.h

@@ -24,18 +24,16 @@ class ClimateIR : public Component,
                   public remote_base::RemoteTransmittable {
  public:
   ClimateIR(float minimum_temperature, float maximum_temperature, float temperature_step = 1.0f,
-            bool supports_dry = false, bool supports_fan_only = false,
-            climate::ClimateFanModeMask fan_modes = climate::ClimateFanModeMask(),
-            climate::ClimateSwingModeMask swing_modes = climate::ClimateSwingModeMask(),
-            climate::ClimatePresetMask presets = climate::ClimatePresetMask()) {
+            bool supports_dry = false, bool supports_fan_only = false, std::set<climate::ClimateFanMode> fan_modes = {},
+            std::set<climate::ClimateSwingMode> swing_modes = {}, std::set<climate::ClimatePreset> presets = {}) {
     this->minimum_temperature_ = minimum_temperature;
     this->maximum_temperature_ = maximum_temperature;
     this->temperature_step_ = temperature_step;
     this->supports_dry_ = supports_dry;
     this->supports_fan_only_ = supports_fan_only;
-    this->fan_modes_ = fan_modes;
-    this->swing_modes_ = swing_modes;
-    this->presets_ = presets;
+    this->fan_modes_ = std::move(fan_modes);
+    this->swing_modes_ = std::move(swing_modes);
+    this->presets_ = std::move(presets);
   }
 
   void setup() override;
@@ -62,9 +60,9 @@ class ClimateIR : public Component,
   bool supports_heat_{true};
   bool supports_dry_{false};
   bool supports_fan_only_{false};
-  climate::ClimateFanModeMask fan_modes_{};
-  climate::ClimateSwingModeMask swing_modes_{};
-  climate::ClimatePresetMask presets_{};
+  std::set<climate::ClimateFanMode> fan_modes_ = {};
+  std::set<climate::ClimateSwingMode> swing_modes_ = {};
+  std::set<climate::ClimatePreset> presets_ = {};
 
   sensor::Sensor *sensor_{nullptr};
 };

esphome/components/esp32_ble/ble.cpp

@@ -76,10 +76,6 @@ void ESP32BLE::advertising_set_service_data(const std::vector<uint8_t> &data) {
 }
 
 void ESP32BLE::advertising_set_manufacturer_data(const std::vector<uint8_t> &data) {
-  this->advertising_set_manufacturer_data(std::span<const uint8_t>(data));
-}
-
-void ESP32BLE::advertising_set_manufacturer_data(std::span<const uint8_t> data) {
   this->advertising_init_();
   this->advertising_->set_manufacturer_data(data);
   this->advertising_start();

esphome/components/esp32_ble/ble.h

@@ -118,7 +118,6 @@ class ESP32BLE : public Component {
   void advertising_start();
   void advertising_set_service_data(const std::vector<uint8_t> &data);
   void advertising_set_manufacturer_data(const std::vector<uint8_t> &data);
-  void advertising_set_manufacturer_data(std::span<const uint8_t> data);
   void advertising_set_appearance(uint16_t appearance) { this->appearance_ = appearance; }
   void advertising_set_service_data_and_name(std::span<const uint8_t> data, bool include_name);
   void advertising_add_service_uuid(ESPBTUUID uuid);

esphome/components/esp32_ble/ble_advertising.cpp

@@ -59,10 +59,6 @@ void BLEAdvertising::set_service_data(const std::vector<uint8_t> &data) {
 }
 
 void BLEAdvertising::set_manufacturer_data(const std::vector<uint8_t> &data) {
-  this->set_manufacturer_data(std::span<const uint8_t>(data));
-}
-
-void BLEAdvertising::set_manufacturer_data(std::span<const uint8_t> data) {
   delete[] this->advertising_data_.p_manufacturer_data;
   this->advertising_data_.p_manufacturer_data = nullptr;
   this->advertising_data_.manufacturer_len = data.size();

esphome/components/esp32_ble/ble_advertising.h

@@ -37,7 +37,6 @@ class BLEAdvertising {
   void set_scan_response(bool scan_response) { this->scan_response_ = scan_response; }
   void set_min_preferred_interval(uint16_t interval) { this->advertising_data_.min_interval = interval; }
   void set_manufacturer_data(const std::vector<uint8_t> &data);
-  void set_manufacturer_data(std::span<const uint8_t> data);
   void set_appearance(uint16_t appearance) { this->advertising_data_.appearance = appearance; }
   void set_service_data(const std::vector<uint8_t> &data);
   void set_service_data(std::span<const uint8_t> data);

esphome/components/esp32_ble_beacon/esp32_ble_beacon.cpp

@@ -1,6 +1,5 @@
 #include "esp32_ble_beacon.h"
 #include "esphome/core/log.h"
-#include "esphome/core/helpers.h"
 
 #ifdef USE_ESP32
 

esphome/components/esp32_ble_server/__init__.py

@@ -461,9 +461,7 @@ async def parse_value(value_config, args):
     if isinstance(value, str):
         value = list(value.encode(value_config[CONF_STRING_ENCODING]))
     if isinstance(value, list):
-        # Generate initializer list {1, 2, 3} instead of std::vector<uint8_t>({1, 2, 3})
-        # This calls the set_value(std::initializer_list<uint8_t>) overload
-        return cg.ArrayInitializer(*value)
+        return cg.std_vector.template(cg.uint8)(value)
     val = cg.RawExpression(f"{value_config[CONF_TYPE]}({cg.safe_exp(value)})")
     return ByteBuffer_ns.wrap(val, value_config[CONF_ENDIANNESS])
 

esphome/components/esp32_ble_server/ble_characteristic.cpp

@@ -35,18 +35,13 @@ BLECharacteristic::BLECharacteristic(const ESPBTUUID uuid, uint32_t properties)
 
 void BLECharacteristic::set_value(ByteBuffer buffer) { this->set_value(buffer.get_data()); }
 
-void BLECharacteristic::set_value(std::vector<uint8_t> &&buffer) {
+void BLECharacteristic::set_value(const std::vector<uint8_t> &buffer) {
   xSemaphoreTake(this->set_value_lock_, 0L);
-  this->value_ = std::move(buffer);
+  this->value_ = buffer;
   xSemaphoreGive(this->set_value_lock_);
 }
-
-void BLECharacteristic::set_value(std::initializer_list<uint8_t> data) {
-  this->set_value(std::vector<uint8_t>(data));  // Delegate to move overload
-}
-
 void BLECharacteristic::set_value(const std::string &buffer) {
-  this->set_value(std::vector<uint8_t>(buffer.begin(), buffer.end()));  // Delegate to move overload
+  this->set_value(std::vector<uint8_t>(buffer.begin(), buffer.end()));
 }
 
 void BLECharacteristic::notify() {

esphome/components/esp32_ble_server/ble_characteristic.h

@@ -33,8 +33,7 @@ class BLECharacteristic {
   ~BLECharacteristic();
 
   void set_value(ByteBuffer buffer);
-  void set_value(std::vector<uint8_t> &&buffer);
-  void set_value(std::initializer_list<uint8_t> data);
+  void set_value(const std::vector<uint8_t> &buffer);
   void set_value(const std::string &buffer);
 
   void set_broadcast_property(bool value);

esphome/components/esp32_ble_server/ble_descriptor.cpp

@@ -46,17 +46,15 @@ void BLEDescriptor::do_create(BLECharacteristic *characteristic) {
   this->state_ = CREATING;
 }
 
-void BLEDescriptor::set_value(std::vector<uint8_t> &&buffer) { this->set_value_impl_(buffer.data(), buffer.size()); }
+void BLEDescriptor::set_value(std::vector<uint8_t> buffer) {
+  size_t length = buffer.size();
 
-void BLEDescriptor::set_value(std::initializer_list<uint8_t> data) { this->set_value_impl_(data.begin(), data.size()); }
-
-void BLEDescriptor::set_value_impl_(const uint8_t *data, size_t length) {
   if (length > this->value_.attr_max_len) {
     ESP_LOGE(TAG, "Size %d too large, must be no bigger than %d", length, this->value_.attr_max_len);
     return;
   }
   this->value_.attr_len = length;
-  memcpy(this->value_.attr_value, data, length);
+  memcpy(this->value_.attr_value, buffer.data(), length);
 }
 
 void BLEDescriptor::gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if,

esphome/components/esp32_ble_server/ble_descriptor.h

@@ -27,8 +27,7 @@ class BLEDescriptor {
   void do_create(BLECharacteristic *characteristic);
   ESPBTUUID get_uuid() const { return this->uuid_; }
 
-  void set_value(std::vector<uint8_t> &&buffer);
-  void set_value(std::initializer_list<uint8_t> data);
+  void set_value(std::vector<uint8_t> buffer);
   void set_value(ByteBuffer buffer) { this->set_value(buffer.get_data()); }
 
   void gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param);
@@ -43,8 +42,6 @@ class BLEDescriptor {
   }
 
  protected:
-  void set_value_impl_(const uint8_t *data, size_t length);
-
   BLECharacteristic *characteristic_{nullptr};
   ESPBTUUID uuid_;
   uint16_t handle_{0xFFFF};

esphome/components/esp32_ble_server/ble_server_automations.cpp

@@ -15,10 +15,7 @@ Trigger<std::vector<uint8_t>, uint16_t> *BLETriggers::create_characteristic_on_w
   Trigger<std::vector<uint8_t>, uint16_t> *on_write_trigger =  // NOLINT(cppcoreguidelines-owning-memory)
       new Trigger<std::vector<uint8_t>, uint16_t>();
   characteristic->on_write([on_write_trigger](std::span<const uint8_t> data, uint16_t id) {
-    // Convert span to vector for trigger - copy is necessary because:
-    // 1. Trigger stores the data for use in automation actions that execute later
-    // 2. The span is only valid during this callback (points to temporary BLE stack data)
-    // 3. User lambdas in automations need persistent data they can access asynchronously
+    // Convert span to vector for trigger
     on_write_trigger->trigger(std::vector<uint8_t>(data.begin(), data.end()), id);
   });
   return on_write_trigger;
@@ -30,10 +27,7 @@ Trigger<std::vector<uint8_t>, uint16_t> *BLETriggers::create_descriptor_on_write
   Trigger<std::vector<uint8_t>, uint16_t> *on_write_trigger =  // NOLINT(cppcoreguidelines-owning-memory)
       new Trigger<std::vector<uint8_t>, uint16_t>();
   descriptor->on_write([on_write_trigger](std::span<const uint8_t> data, uint16_t id) {
-    // Convert span to vector for trigger - copy is necessary because:
-    // 1. Trigger stores the data for use in automation actions that execute later
-    // 2. The span is only valid during this callback (points to temporary BLE stack data)
-    // 3. User lambdas in automations need persistent data they can access asynchronously
+    // Convert span to vector for trigger
     on_write_trigger->trigger(std::vector<uint8_t>(data.begin(), data.end()), id);
   });
   return on_write_trigger;

esphome/components/esp32_improv/esp32_improv_component.cpp

@@ -270,8 +270,8 @@ void ESP32ImprovComponent::set_error_(improv::Error error) {
   }
 }
 
-void ESP32ImprovComponent::send_response_(std::vector<uint8_t> &&response) {
-  this->rpc_response_->set_value(std::move(response));
+void ESP32ImprovComponent::send_response_(std::vector<uint8_t> &response) {
+  this->rpc_response_->set_value(ByteBuffer::wrap(response));
   if (this->state_ != improv::STATE_STOPPED)
     this->rpc_response_->notify();
 }
@@ -409,8 +409,10 @@ void ESP32ImprovComponent::check_wifi_connection_() {
       }
     }
 #endif
-    this->send_response_(improv::build_rpc_response(improv::WIFI_SETTINGS,
-                                                    std::vector<std::string>(url_strings, url_strings + url_count)));
+    // Pass to build_rpc_response using vector constructor from iterators to avoid extra copies
+    std::vector<uint8_t> data = improv::build_rpc_response(
+        improv::WIFI_SETTINGS, std::vector<std::string>(url_strings, url_strings + url_count));
+    this->send_response_(data);
   } else if (this->is_active() && this->state_ != improv::STATE_PROVISIONED) {
     ESP_LOGD(TAG, "WiFi provisioned externally");
   }

esphome/components/esp32_improv/esp32_improv_component.h

@@ -109,7 +109,7 @@ class ESP32ImprovComponent : public Component, public improv_base::ImprovBase {
   void set_state_(improv::State state, bool update_advertising = true);
   void set_error_(improv::Error error);
   improv::State get_initial_state_() const;
-  void send_response_(std::vector<uint8_t> &&response);
+  void send_response_(std::vector<uint8_t> &response);
   void process_incoming_data_();
   void on_wifi_connect_timeout_();
   void check_wifi_connection_();

esphome/components/ethernet/__init__.py

@@ -14,7 +14,7 @@ from esphome.components.esp32.const import (
     VARIANT_ESP32S2,
     VARIANT_ESP32S3,
 )
-from esphome.components.network import ip_address_literal
+from esphome.components.network import IPAddress
 from esphome.components.spi import CONF_INTERFACE_INDEX, get_spi_interface
 import esphome.config_validation as cv
 from esphome.const import (
@@ -320,11 +320,11 @@ def _final_validate_spi(config):
 def manual_ip(config):
     return cg.StructInitializer(
         ManualIP,
-        ("static_ip", ip_address_literal(config[CONF_STATIC_IP])),
-        ("gateway", ip_address_literal(config[CONF_GATEWAY])),
-        ("subnet", ip_address_literal(config[CONF_SUBNET])),
-        ("dns1", ip_address_literal(config[CONF_DNS1])),
-        ("dns2", ip_address_literal(config[CONF_DNS2])),
+        ("static_ip", IPAddress(str(config[CONF_STATIC_IP]))),
+        ("gateway", IPAddress(str(config[CONF_GATEWAY]))),
+        ("subnet", IPAddress(str(config[CONF_SUBNET]))),
+        ("dns1", IPAddress(str(config[CONF_DNS1]))),
+        ("dns2", IPAddress(str(config[CONF_DNS2]))),
     )
 
 

esphome/components/fan/fan.cpp

@@ -51,14 +51,7 @@ void FanCall::validate_() {
 
   if (!this->preset_mode_.empty()) {
     const auto &preset_modes = traits.supported_preset_modes();
-    bool found = false;
-    for (const auto &mode : preset_modes) {
-      if (mode == this->preset_mode_) {
-        found = true;
-        break;
-      }
-    }
-    if (!found) {
+    if (preset_modes.find(this->preset_mode_) == preset_modes.end()) {
       ESP_LOGW(TAG, "%s: Preset mode '%s' not supported", this->parent_.get_name().c_str(), this->preset_mode_.c_str());
       this->preset_mode_.clear();
     }
@@ -198,14 +191,9 @@ void Fan::save_state_() {
   if (this->get_traits().supports_preset_modes() && !this->preset_mode.empty()) {
     const auto &preset_modes = this->get_traits().supported_preset_modes();
     // Store index of current preset mode
-    size_t i = 0;
-    for (const auto &mode : preset_modes) {
-      if (mode == this->preset_mode) {
-        state.preset_mode = i;
-        break;
-      }
-      i++;
-    }
+    auto preset_iterator = preset_modes.find(this->preset_mode);
+    if (preset_iterator != preset_modes.end())
+      state.preset_mode = std::distance(preset_modes.begin(), preset_iterator);
   }
 
   this->rtc_.save(&state);

esphome/components/fan/fan_traits.h

@@ -1,6 +1,7 @@
-#pragma once
+#include <set>
+#include <utility>
 
-#include <vector>
+#pragma once
 
 namespace esphome {
 
@@ -35,9 +36,9 @@ class FanTraits {
   /// Set whether this fan supports changing direction
   void set_direction(bool direction) { this->direction_ = direction; }
   /// Return the preset modes supported by the fan.
-  const std::vector<std::string> &supported_preset_modes() const { return this->preset_modes_; }
+  std::set<std::string> supported_preset_modes() const { return this->preset_modes_; }
   /// Set the preset modes supported by the fan.
-  void set_supported_preset_modes(const std::vector<std::string> &preset_modes) { this->preset_modes_ = preset_modes; }
+  void set_supported_preset_modes(const std::set<std::string> &preset_modes) { this->preset_modes_ = preset_modes; }
   /// Return if preset modes are supported
   bool supports_preset_modes() const { return !this->preset_modes_.empty(); }
 
@@ -45,17 +46,17 @@ class FanTraits {
 #ifdef USE_API
   // The API connection is a friend class to access internal methods
   friend class api::APIConnection;
-  // This method returns a reference to the internal preset modes.
+  // This method returns a reference to the internal preset modes set.
   // It is used by the API to avoid copying data when encoding messages.
   // Warning: Do not use this method outside of the API connection code.
   // It returns a reference to internal data that can be invalidated.
-  const std::vector<std::string> &supported_preset_modes_for_api_() const { return this->preset_modes_; }
+  const std::set<std::string> &supported_preset_modes_for_api_() const { return this->preset_modes_; }
 #endif
   bool oscillation_{false};
   bool speed_{false};
   bool direction_{false};
   int speed_count_{};
-  std::vector<std::string> preset_modes_{};
+  std::set<std::string> preset_modes_{};
 };
 
 }  // namespace fan

esphome/components/haier/haier_base.cpp

@@ -171,7 +171,7 @@ void HaierClimateBase::toggle_power() {
       PendingAction({ActionRequest::TOGGLE_POWER, esphome::optional<haier_protocol::HaierMessage>()});
 }
 
-void HaierClimateBase::set_supported_swing_modes(climate::ClimateSwingModeMask modes) {
+void HaierClimateBase::set_supported_swing_modes(const std::set<climate::ClimateSwingMode> &modes) {
   this->traits_.set_supported_swing_modes(modes);
   if (!modes.empty())
     this->traits_.add_supported_swing_mode(climate::CLIMATE_SWING_OFF);
@@ -179,13 +179,13 @@ void HaierClimateBase::set_supported_swing_modes(climate::ClimateSwingModeMask m
 
 void HaierClimateBase::set_answer_timeout(uint32_t timeout) { this->haier_protocol_.set_answer_timeout(timeout); }
 
-void HaierClimateBase::set_supported_modes(climate::ClimateModeMask modes) {
+void HaierClimateBase::set_supported_modes(const std::set<climate::ClimateMode> &modes) {
   this->traits_.set_supported_modes(modes);
   this->traits_.add_supported_mode(climate::CLIMATE_MODE_OFF);        // Always available
   this->traits_.add_supported_mode(climate::CLIMATE_MODE_HEAT_COOL);  // Always available
 }
 
-void HaierClimateBase::set_supported_presets(climate::ClimatePresetMask presets) {
+void HaierClimateBase::set_supported_presets(const std::set<climate::ClimatePreset> &presets) {
   this->traits_.set_supported_presets(presets);
   if (!presets.empty())
     this->traits_.add_supported_preset(climate::CLIMATE_PRESET_NONE);

esphome/components/haier/haier_base.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <chrono>
+#include <set>
 #include "esphome/components/climate/climate.h"
 #include "esphome/components/uart/uart.h"
 #include "esphome/core/automation.h"
@@ -59,9 +60,9 @@ class HaierClimateBase : public esphome::Component,
   void send_power_off_command();
   void toggle_power();
   void reset_protocol() { this->reset_protocol_request_ = true; };
-  void set_supported_modes(esphome::climate::ClimateModeMask modes);
-  void set_supported_swing_modes(esphome::climate::ClimateSwingModeMask modes);
-  void set_supported_presets(esphome::climate::ClimatePresetMask presets);
+  void set_supported_modes(const std::set<esphome::climate::ClimateMode> &modes);
+  void set_supported_swing_modes(const std::set<esphome::climate::ClimateSwingMode> &modes);
+  void set_supported_presets(const std::set<esphome::climate::ClimatePreset> &presets);
   bool valid_connection() const { return this->protocol_phase_ >= ProtocolPhases::IDLE; };
   size_t available() noexcept override { return esphome::uart::UARTDevice::available(); };
   size_t read_array(uint8_t *data, size_t len) noexcept override {

esphome/components/haier/hon_climate.cpp

@@ -1033,9 +1033,9 @@ haier_protocol::HandlerError HonClimate::process_status_message_(const uint8_t *
   {
     // Swing mode
     ClimateSwingMode old_swing_mode = this->swing_mode;
-    const auto &swing_modes = traits_.get_supported_swing_modes();
-    bool vertical_swing_supported = swing_modes.count(CLIMATE_SWING_VERTICAL);
-    bool horizontal_swing_supported = swing_modes.count(CLIMATE_SWING_HORIZONTAL);
+    const std::set<ClimateSwingMode> &swing_modes = traits_.get_supported_swing_modes();
+    bool vertical_swing_supported = swing_modes.find(CLIMATE_SWING_VERTICAL) != swing_modes.end();
+    bool horizontal_swing_supported = swing_modes.find(CLIMATE_SWING_HORIZONTAL) != swing_modes.end();
     if (horizontal_swing_supported &&
         (packet.control.horizontal_swing_mode == (uint8_t) hon_protocol::HorizontalSwingMode::AUTO)) {
       if (vertical_swing_supported &&
@@ -1218,13 +1218,13 @@ void HonClimate::fill_control_messages_queue_() {
                                                 (uint8_t) hon_protocol::DataParameters::QUIET_MODE,
                                             quiet_mode_buf, 2);
     }
-    if ((fast_mode_buf[1] != 0xFF) && presets.count(climate::ClimatePreset::CLIMATE_PRESET_BOOST)) {
+    if ((fast_mode_buf[1] != 0xFF) && ((presets.find(climate::ClimatePreset::CLIMATE_PRESET_BOOST) != presets.end()))) {
       this->control_messages_queue_.emplace(haier_protocol::FrameType::CONTROL,
                                             (uint16_t) hon_protocol::SubcommandsControl::SET_SINGLE_PARAMETER +
                                                 (uint8_t) hon_protocol::DataParameters::FAST_MODE,
                                             fast_mode_buf, 2);
     }
-    if ((away_mode_buf[1] != 0xFF) && presets.count(climate::ClimatePreset::CLIMATE_PRESET_AWAY)) {
+    if ((away_mode_buf[1] != 0xFF) && ((presets.find(climate::ClimatePreset::CLIMATE_PRESET_AWAY) != presets.end()))) {
       this->control_messages_queue_.emplace(haier_protocol::FrameType::CONTROL,
                                             (uint16_t) hon_protocol::SubcommandsControl::SET_SINGLE_PARAMETER +
                                                 (uint8_t) hon_protocol::DataParameters::TEN_DEGREE,

esphome/components/hbridge/fan/hbridge_fan.h

@@ -22,7 +22,7 @@ class HBridgeFan : public Component, public fan::Fan {
   void set_pin_a(output::FloatOutput *pin_a) { pin_a_ = pin_a; }
   void set_pin_b(output::FloatOutput *pin_b) { pin_b_ = pin_b; }
   void set_enable_pin(output::FloatOutput *enable) { enable_ = enable; }
-  void set_preset_modes(const std::vector<std::string> &presets) { preset_modes_ = presets; }
+  void set_preset_modes(const std::set<std::string> &presets) { preset_modes_ = presets; }
 
   void setup() override;
   void dump_config() override;
@@ -38,7 +38,7 @@ class HBridgeFan : public Component, public fan::Fan {
   int speed_count_{};
   DecayMode decay_mode_{DECAY_MODE_SLOW};
   fan::FanTraits traits_;
-  std::vector<std::string> preset_modes_{};
+  std::set<std::string> preset_modes_{};
 
   void control(const fan::FanCall &call) override;
   void write_state_();

esphome/components/heatpumpir/heatpumpir.h

@@ -97,11 +97,12 @@ const float TEMP_MAX = 100;  // Celsius
 class HeatpumpIRClimate : public climate_ir::ClimateIR {
  public:
   HeatpumpIRClimate()
-      : climate_ir::ClimateIR(TEMP_MIN, TEMP_MAX, 1.0f, true, true,
-                              {climate::CLIMATE_FAN_LOW, climate::CLIMATE_FAN_MEDIUM, climate::CLIMATE_FAN_HIGH,
-                               climate::CLIMATE_FAN_AUTO},
-                              {climate::CLIMATE_SWING_OFF, climate::CLIMATE_SWING_HORIZONTAL,
-                               climate::CLIMATE_SWING_VERTICAL, climate::CLIMATE_SWING_BOTH}) {}
+      : climate_ir::ClimateIR(
+            TEMP_MIN, TEMP_MAX, 1.0f, true, true,
+            std::set<climate::ClimateFanMode>{climate::CLIMATE_FAN_LOW, climate::CLIMATE_FAN_MEDIUM,
+                                              climate::CLIMATE_FAN_HIGH, climate::CLIMATE_FAN_AUTO},
+            std::set<climate::ClimateSwingMode>{climate::CLIMATE_SWING_OFF, climate::CLIMATE_SWING_HORIZONTAL,
+                                                climate::CLIMATE_SWING_VERTICAL, climate::CLIMATE_SWING_BOTH}) {}
   void setup() override;
   void set_protocol(Protocol protocol) { this->protocol_ = protocol; }
   void set_horizontal_default(HorizontalDirection horizontal_direction) {

esphome/components/http_request/http_request.h

@@ -124,7 +124,7 @@ class HttpRequestComponent : public Component {
   float get_setup_priority() const override { return setup_priority::AFTER_WIFI; }
 
   void set_useragent(const char *useragent) { this->useragent_ = useragent; }
-  void set_timeout(uint32_t timeout) { this->timeout_ = timeout; }
+  void set_timeout(uint16_t timeout) { this->timeout_ = timeout; }
   void set_watchdog_timeout(uint32_t watchdog_timeout) { this->watchdog_timeout_ = watchdog_timeout; }
   uint32_t get_watchdog_timeout() const { return this->watchdog_timeout_; }
   void set_follow_redirects(bool follow_redirects) { this->follow_redirects_ = follow_redirects; }
@@ -173,7 +173,7 @@ class HttpRequestComponent : public Component {
   const char *useragent_{nullptr};
   bool follow_redirects_{};
   uint16_t redirect_limit_{};
-  uint32_t timeout_{4500};
+  uint16_t timeout_{4500};
   uint32_t watchdog_timeout_{0};
 };
 

esphome/components/i2c/i2c_bus_esp_idf.cpp

@@ -107,7 +107,7 @@ void IDFI2CBus::dump_config() {
         if (s.second) {
           ESP_LOGCONFIG(TAG, "Found device at address 0x%02X", s.first);
         } else {
-          ESP_LOGCONFIG(TAG, "Unknown error at address 0x%02X", s.first);
+          ESP_LOGE(TAG, "Unknown error at address 0x%02X", s.first);
         }
       }
     }

esphome/components/light/addressable_light_effect.h

@@ -57,9 +57,9 @@ class AddressableLightEffect : public LightEffect {
 
 class AddressableLambdaLightEffect : public AddressableLightEffect {
  public:
-  AddressableLambdaLightEffect(const char *name, void (*f)(AddressableLight &, Color, bool initial_run),
+  AddressableLambdaLightEffect(const char *name, std::function<void(AddressableLight &, Color, bool initial_run)> f,
                                uint32_t update_interval)
-      : AddressableLightEffect(name), f_(f), update_interval_(update_interval) {}
+      : AddressableLightEffect(name), f_(std::move(f)), update_interval_(update_interval) {}
   void start() override { this->initial_run_ = true; }
   void apply(AddressableLight &it, const Color &current_color) override {
     const uint32_t now = millis();
@@ -72,7 +72,7 @@ class AddressableLambdaLightEffect : public AddressableLightEffect {
   }
 
  protected:
-  void (*f_)(AddressableLight &, Color, bool initial_run);
+  std::function<void(AddressableLight &, Color, bool initial_run)> f_;
   uint32_t update_interval_;
   uint32_t last_run_{0};
   bool initial_run_;

esphome/components/light/base_light_effects.h

@@ -112,8 +112,8 @@ class RandomLightEffect : public LightEffect {
 
 class LambdaLightEffect : public LightEffect {
  public:
-  LambdaLightEffect(const char *name, void (*f)(bool initial_run), uint32_t update_interval)
-      : LightEffect(name), f_(f), update_interval_(update_interval) {}
+  LambdaLightEffect(const char *name, std::function<void(bool initial_run)> f, uint32_t update_interval)
+      : LightEffect(name), f_(std::move(f)), update_interval_(update_interval) {}
 
   void start() override { this->initial_run_ = true; }
   void apply() override {
@@ -130,7 +130,7 @@ class LambdaLightEffect : public LightEffect {
   uint32_t get_current_index() const { return this->get_index(); }
 
  protected:
-  void (*f_)(bool initial_run);
+  std::function<void(bool initial_run)> f_;
   uint32_t update_interval_;
   uint32_t last_run_{0};
   bool initial_run_;

esphome/components/logger/__init__.py

@@ -1,7 +1,7 @@
 import re
 
 from esphome import automation
-from esphome.automation import LambdaAction, StatelessLambdaAction
+from esphome.automation import LambdaAction
 import esphome.codegen as cg
 from esphome.components.esp32 import add_idf_sdkconfig_option, get_esp32_variant
 from esphome.components.esp32.const import (
@@ -430,9 +430,7 @@ async def logger_log_action_to_code(config, action_id, template_arg, args):
     text = str(cg.statement(esp_log(config[CONF_TAG], config[CONF_FORMAT], *args_)))
 
     lambda_ = await cg.process_lambda(Lambda(text), args, return_type=cg.void)
-    return automation.new_lambda_pvariable(
-        action_id, lambda_, StatelessLambdaAction, template_arg
-    )
+    return cg.new_Pvariable(action_id, template_arg, lambda_)
 
 
 @automation.register_action(
@@ -457,9 +455,7 @@ async def logger_set_level_to_code(config, action_id, template_arg, args):
         text = str(cg.statement(logger.set_log_level(level)))
 
     lambda_ = await cg.process_lambda(Lambda(text), args, return_type=cg.void)
-    return automation.new_lambda_pvariable(
-        action_id, lambda_, StatelessLambdaAction, template_arg
-    )
+    return cg.new_Pvariable(action_id, template_arg, lambda_)
 
 
 FILTER_SOURCE_FILES = filter_source_files_from_platform(

esphome/components/lvgl/lvgl_esphome.h

@@ -358,7 +358,7 @@ class LvSelectable : public LvCompound {
   virtual void set_selected_index(size_t index, lv_anim_enable_t anim) = 0;
   void set_selected_text(const std::string &text, lv_anim_enable_t anim);
   std::string get_selected_text();
-  const std::vector<std::string> &get_options() { return this->options_; }
+  std::vector<std::string> get_options() { return this->options_; }
   void set_options(std::vector<std::string> options);
 
  protected:

esphome/components/lvgl/select/lvgl_select.h

@@ -53,17 +53,7 @@ class LVGLSelect : public select::Select, public Component {
     this->widget_->set_selected_text(value, this->anim_);
     this->publish();
   }
-  void set_options_() {
-    // Widget uses std::vector<std::string>, SelectTraits uses FixedVector<const char*>
-    // Convert by extracting c_str() pointers
-    const auto &opts = this->widget_->get_options();
-    FixedVector<const char *> opt_ptrs;
-    opt_ptrs.init(opts.size());
-    for (size_t i = 0; i < opts.size(); i++) {
-      opt_ptrs[i] = opts[i].c_str();
-    }
-    this->traits.set_options(opt_ptrs);
-  }
+  void set_options_() { this->traits.set_options(this->widget_->get_options()); }
 
   LvSelectable *widget_;
   lv_anim_enable_t anim_;

esphome/components/mcp23016/mcp23016.cpp

@@ -56,7 +56,7 @@ void MCP23016::pin_mode(uint8_t pin, gpio::Flags flags) {
     this->update_reg_(pin, false, iodir);
   }
 }
-float MCP23016::get_setup_priority() const { return setup_priority::IO; }
+float MCP23016::get_setup_priority() const { return setup_priority::HARDWARE; }
 bool MCP23016::read_reg_(uint8_t reg, uint8_t *value) {
   if (this->is_failed())
     return false;

esphome/components/midea/air_conditioner.h

@@ -19,9 +19,6 @@ using climate::ClimateTraits;
 using climate::ClimateMode;
 using climate::ClimateSwingMode;
 using climate::ClimateFanMode;
-using climate::ClimateModeMask;
-using climate::ClimateSwingModeMask;
-using climate::ClimatePresetMask;
 
 class AirConditioner : public ApplianceBase<dudanov::midea::ac::AirConditioner>, public climate::Climate {
  public:
@@ -43,20 +40,20 @@ class AirConditioner : public ApplianceBase<dudanov::midea::ac::AirConditioner>,
   void do_power_on() { this->base_.setPowerState(true); }
   void do_power_off() { this->base_.setPowerState(false); }
   void do_power_toggle() { this->base_.setPowerState(this->mode == ClimateMode::CLIMATE_MODE_OFF); }
-  void set_supported_modes(ClimateModeMask modes) { this->supported_modes_ = modes; }
-  void set_supported_swing_modes(ClimateSwingModeMask modes) { this->supported_swing_modes_ = modes; }
-  void set_supported_presets(ClimatePresetMask presets) { this->supported_presets_ = presets; }
-  void set_custom_presets(const std::vector<std::string> &presets) { this->supported_custom_presets_ = presets; }
-  void set_custom_fan_modes(const std::vector<std::string> &modes) { this->supported_custom_fan_modes_ = modes; }
+  void set_supported_modes(const std::set<ClimateMode> &modes) { this->supported_modes_ = modes; }
+  void set_supported_swing_modes(const std::set<ClimateSwingMode> &modes) { this->supported_swing_modes_ = modes; }
+  void set_supported_presets(const std::set<ClimatePreset> &presets) { this->supported_presets_ = presets; }
+  void set_custom_presets(const std::set<std::string> &presets) { this->supported_custom_presets_ = presets; }
+  void set_custom_fan_modes(const std::set<std::string> &modes) { this->supported_custom_fan_modes_ = modes; }
 
  protected:
   void control(const ClimateCall &call) override;
   ClimateTraits traits() override;
-  ClimateModeMask supported_modes_{};
-  ClimateSwingModeMask supported_swing_modes_{};
-  ClimatePresetMask supported_presets_{};
-  std::vector<std::string> supported_custom_presets_{};
-  std::vector<std::string> supported_custom_fan_modes_{};
+  std::set<ClimateMode> supported_modes_{};
+  std::set<ClimateSwingMode> supported_swing_modes_{};
+  std::set<ClimatePreset> supported_presets_{};
+  std::set<std::string> supported_custom_presets_{};
+  std::set<std::string> supported_custom_fan_modes_{};
   Sensor *outdoor_sensor_{nullptr};
   Sensor *humidity_sensor_{nullptr};
   Sensor *power_sensor_{nullptr};

esphome/components/modbus_controller/binary_sensor/modbus_binarysensor.h

@@ -33,8 +33,8 @@ class ModbusBinarySensor : public Component, public binary_sensor::BinarySensor,
 
   void dump_config() override;
 
-  using transform_func_t = optional<bool> (*)(ModbusBinarySensor *, bool, const std::vector<uint8_t> &);
-  void set_template(transform_func_t f) { this->transform_func_ = f; }
+  using transform_func_t = std::function<optional<bool>(ModbusBinarySensor *, bool, const std::vector<uint8_t> &)>;
+  void set_template(transform_func_t &&f) { this->transform_func_ = f; }
 
  protected:
   optional<transform_func_t> transform_func_{nullopt};

esphome/components/modbus_controller/number/modbus_number.h

@@ -31,10 +31,10 @@ class ModbusNumber : public number::Number, public Component, public SensorItem
   void set_parent(ModbusController *parent) { this->parent_ = parent; }
   void set_write_multiply(float factor) { this->multiply_by_ = factor; }
 
-  using transform_func_t = optional<float> (*)(ModbusNumber *, float, const std::vector<uint8_t> &);
-  using write_transform_func_t = optional<float> (*)(ModbusNumber *, float, std::vector<uint16_t> &);
-  void set_template(transform_func_t f) { this->transform_func_ = f; }
-  void set_write_template(write_transform_func_t f) { this->write_transform_func_ = f; }
+  using transform_func_t = std::function<optional<float>(ModbusNumber *, float, const std::vector<uint8_t> &)>;
+  using write_transform_func_t = std::function<optional<float>(ModbusNumber *, float, std::vector<uint16_t> &)>;
+  void set_template(transform_func_t &&f) { this->transform_func_ = f; }
+  void set_write_template(write_transform_func_t &&f) { this->write_transform_func_ = f; }
   void set_use_write_mutiple(bool use_write_multiple) { this->use_write_multiple_ = use_write_multiple; }
 
  protected:

esphome/components/modbus_controller/output/modbus_output.h

@@ -29,8 +29,8 @@ class ModbusFloatOutput : public output::FloatOutput, public Component, public S
   // Do nothing
   void parse_and_publish(const std::vector<uint8_t> &data) override{};
 
-  using write_transform_func_t = optional<float> (*)(ModbusFloatOutput *, float, std::vector<uint16_t> &);
-  void set_write_template(write_transform_func_t f) { this->write_transform_func_ = f; }
+  using write_transform_func_t = std::function<optional<float>(ModbusFloatOutput *, float, std::vector<uint16_t> &)>;
+  void set_write_template(write_transform_func_t &&f) { this->write_transform_func_ = f; }
   void set_use_write_mutiple(bool use_write_multiple) { this->use_write_multiple_ = use_write_multiple; }
 
  protected:
@@ -60,8 +60,8 @@ class ModbusBinaryOutput : public output::BinaryOutput, public Component, public
   // Do nothing
   void parse_and_publish(const std::vector<uint8_t> &data) override{};
 
-  using write_transform_func_t = optional<bool> (*)(ModbusBinaryOutput *, bool, std::vector<uint8_t> &);
-  void set_write_template(write_transform_func_t f) { this->write_transform_func_ = f; }
+  using write_transform_func_t = std::function<optional<bool>(ModbusBinaryOutput *, bool, std::vector<uint8_t> &)>;
+  void set_write_template(write_transform_func_t &&f) { this->write_transform_func_ = f; }
   void set_use_write_mutiple(bool use_write_multiple) { this->use_write_multiple_ = use_write_multiple; }
 
  protected:

esphome/components/modbus_controller/select/modbus_select.cpp

@@ -28,7 +28,7 @@ void ModbusSelect::parse_and_publish(const std::vector<uint8_t> &data) {
 
     if (map_it != this->mapping_.cend()) {
       size_t idx = std::distance(this->mapping_.cbegin(), map_it);
-      new_state = std::string(this->option_at(idx));
+      new_state = this->traits.get_options()[idx];
       ESP_LOGV(TAG, "Found option %s for value %lld", new_state->c_str(), value);
     } else {
       ESP_LOGE(TAG, "No option found for mapping %lld", value);
@@ -41,12 +41,10 @@ void ModbusSelect::parse_and_publish(const std::vector<uint8_t> &data) {
 }
 
 void ModbusSelect::control(const std::string &value) {
-  auto idx = this->index_of(value);
-  if (!idx.has_value()) {
-    ESP_LOGW(TAG, "Invalid option '%s'", value.c_str());
-    return;
-  }
-  optional<int64_t> mapval = this->mapping_[idx.value()];
+  auto options = this->traits.get_options();
+  auto opt_it = std::find(options.cbegin(), options.cend(), value);
+  size_t idx = std::distance(options.cbegin(), opt_it);
+  optional<int64_t> mapval = this->mapping_[idx];
   ESP_LOGD(TAG, "Found value %lld for option '%s'", *mapval, value.c_str());
 
   std::vector<uint16_t> data;

esphome/components/modbus_controller/select/modbus_select.h

@@ -26,15 +26,16 @@ class ModbusSelect : public Component, public select::Select, public SensorItem
     this->mapping_ = std::move(mapping);
   }
 
-  using transform_func_t = optional<std::string> (*)(ModbusSelect *const, int64_t, const std::vector<uint8_t> &);
-  using write_transform_func_t = optional<int64_t> (*)(ModbusSelect *const, const std::string &, int64_t,
-                                                       std::vector<uint16_t> &);
+  using transform_func_t =
+      std::function<optional<std::string>(ModbusSelect *const, int64_t, const std::vector<uint8_t> &)>;
+  using write_transform_func_t =
+      std::function<optional<int64_t>(ModbusSelect *const, const std::string &, int64_t, std::vector<uint16_t> &)>;
 
   void set_parent(ModbusController *const parent) { this->parent_ = parent; }
   void set_use_write_mutiple(bool use_write_multiple) { this->use_write_multiple_ = use_write_multiple; }
   void set_optimistic(bool optimistic) { this->optimistic_ = optimistic; }
-  void set_template(transform_func_t f) { this->transform_func_ = f; }
-  void set_write_template(write_transform_func_t f) { this->write_transform_func_ = f; }
+  void set_template(transform_func_t &&f) { this->transform_func_ = f; }
+  void set_write_template(write_transform_func_t &&f) { this->write_transform_func_ = f; }
 
   void dump_config() override;
   void parse_and_publish(const std::vector<uint8_t> &data) override;

esphome/components/modbus_controller/sensor/modbus_sensor.h

@@ -25,9 +25,9 @@ class ModbusSensor : public Component, public sensor::Sensor, public SensorItem
 
   void parse_and_publish(const std::vector<uint8_t> &data) override;
   void dump_config() override;
-  using transform_func_t = optional<float> (*)(ModbusSensor *, float, const std::vector<uint8_t> &);
+  using transform_func_t = std::function<optional<float>(ModbusSensor *, float, const std::vector<uint8_t> &)>;
 
-  void set_template(transform_func_t f) { this->transform_func_ = f; }
+  void set_template(transform_func_t &&f) { this->transform_func_ = f; }
 
  protected:
   optional<transform_func_t> transform_func_{nullopt};

esphome/components/modbus_controller/switch/modbus_switch.h

@@ -34,10 +34,10 @@ class ModbusSwitch : public Component, public switch_::Switch, public SensorItem
   void parse_and_publish(const std::vector<uint8_t> &data) override;
   void set_parent(ModbusController *parent) { this->parent_ = parent; }
 
-  using transform_func_t = optional<bool> (*)(ModbusSwitch *, bool, const std::vector<uint8_t> &);
-  using write_transform_func_t = optional<bool> (*)(ModbusSwitch *, bool, std::vector<uint8_t> &);
-  void set_template(transform_func_t f) { this->publish_transform_func_ = f; }
-  void set_write_template(write_transform_func_t f) { this->write_transform_func_ = f; }
+  using transform_func_t = std::function<optional<bool>(ModbusSwitch *, bool, const std::vector<uint8_t> &)>;
+  using write_transform_func_t = std::function<optional<bool>(ModbusSwitch *, bool, std::vector<uint8_t> &)>;
+  void set_template(transform_func_t &&f) { this->publish_transform_func_ = f; }
+  void set_write_template(write_transform_func_t &&f) { this->write_transform_func_ = f; }
   void set_use_write_mutiple(bool use_write_multiple) { this->use_write_multiple_ = use_write_multiple; }
 
  protected:

esphome/components/modbus_controller/text_sensor/modbus_textsensor.h

@@ -30,8 +30,9 @@ class ModbusTextSensor : public Component, public text_sensor::TextSensor, publi
   void dump_config() override;
 
   void parse_and_publish(const std::vector<uint8_t> &data) override;
-  using transform_func_t = optional<std::string> (*)(ModbusTextSensor *, std::string, const std::vector<uint8_t> &);
-  void set_template(transform_func_t f) { this->transform_func_ = f; }
+  using transform_func_t =
+      std::function<optional<std::string>(ModbusTextSensor *, std::string, const std::vector<uint8_t> &)>;
+  void set_template(transform_func_t &&f) { this->transform_func_ = f; }
 
  protected:
   optional<transform_func_t> transform_func_{nullopt};

esphome/components/network/__init__.py

@@ -1,5 +1,3 @@
-import ipaddress
-
 import esphome.codegen as cg
 from esphome.components.esp32 import add_idf_sdkconfig_option
 import esphome.config_validation as cv
@@ -12,41 +10,6 @@ AUTO_LOAD = ["mdns"]
 network_ns = cg.esphome_ns.namespace("network")
 IPAddress = network_ns.class_("IPAddress")
 
-
-def ip_address_literal(ip: str | int | None) -> cg.MockObj:
-    """Generate an IPAddress with compile-time initialization instead of runtime parsing.
-
-    This function parses the IP address in Python during code generation and generates
-    a call to the 4-octet constructor (IPAddress(192, 168, 1, 1)) instead of the
-    string constructor (IPAddress("192.168.1.1")). This eliminates runtime string
-    parsing overhead and reduces flash usage on embedded systems.
-
-    Args:
-        ip: IP address as string (e.g., "192.168.1.1"), ipaddress.IPv4Address, or None
-
-    Returns:
-        IPAddress expression that uses 4-octet constructor for efficiency
-    """
-    if ip is None:
-        return IPAddress(0, 0, 0, 0)
-
-    try:
-        # Parse using Python's ipaddress module
-        ip_obj = ipaddress.ip_address(ip)
-    except (ValueError, TypeError):
-        pass
-    else:
-        # Only support IPv4 for now
-        if isinstance(ip_obj, ipaddress.IPv4Address):
-            # Extract octets from the packed bytes representation
-            octets = ip_obj.packed
-            # Generate call to 4-octet constructor: IPAddress(192, 168, 1, 1)
-            return IPAddress(octets[0], octets[1], octets[2], octets[3])
-
-    # Fallback to string constructor if parsing fails
-    return IPAddress(str(ip))
-
-
 CONFIG_SCHEMA = cv.Schema(
     {
         cv.SplitDefault(

esphome/components/nextion/nextion.h

@@ -540,23 +540,6 @@ class Nextion : public NextionBase, public PollingComponent, public uart::UARTDe
    */
   void goto_page(uint8_t page);
 
-  /**
-   * Set the visibility of a component.
-   *
-   * @param component The component name.
-   * @param show True to show the component, false to hide it.
-   *
-   * @see show_component()
-   * @see hide_component()
-   *
-   * Example:
-   * ```cpp
-   * it.set_component_visibility("textview", true);   // Equivalent to show_component("textview")
-   * it.set_component_visibility("textview", false);  // Equivalent to hide_component("textview")
-   * ```
-   */
-  void set_component_visibility(const char *component, bool show) override;
-
   /**
    * Hide a component.
    * @param component The component name.

esphome/components/nextion/nextion_base.h

@@ -45,7 +45,6 @@ class NextionBase {
   virtual void set_component_pressed_font_color(const char *component, Color color) = 0;
   virtual void set_component_font(const char *component, uint8_t font_id) = 0;
 
-  virtual void set_component_visibility(const char *component, bool show) = 0;
   virtual void show_component(const char *component) = 0;
   virtual void hide_component(const char *component) = 0;
 

esphome/components/nextion/nextion_commands.cpp

@@ -201,13 +201,13 @@ void Nextion::set_component_font(const char *component, uint8_t font_id) {
   this->add_no_result_to_queue_with_printf_("set_component_font", "%s.font=%" PRIu8, component, font_id);
 }
 
-void Nextion::set_component_visibility(const char *component, bool show) {
-  this->add_no_result_to_queue_with_printf_("set_component_visibility", "vis %s,%d", component, show ? 1 : 0);
+void Nextion::hide_component(const char *component) {
+  this->add_no_result_to_queue_with_printf_("hide_component", "vis %s,0", component);
 }
 
-void Nextion::hide_component(const char *component) { this->set_component_visibility(component, false); }
-
-void Nextion::show_component(const char *component) { this->set_component_visibility(component, true); }
+void Nextion::show_component(const char *component) {
+  this->add_no_result_to_queue_with_printf_("show_component", "vis %s,1", component);
+}
 
 void Nextion::enable_component_touch(const char *component) {
   this->add_no_result_to_queue_with_printf_("enable_component_touch", "tsw %s,1", component);

esphome/components/nextion/nextion_component.cpp

@@ -81,11 +81,13 @@ void NextionComponent::update_component_settings(bool force_update) {
 
     this->component_flags_.visible_needs_update = false;
 
-    this->nextion_->set_component_visibility(name_to_send.c_str(), this->component_flags_.visible);
-    if (!this->component_flags_.visible) {
+    if (this->component_flags_.visible) {
+      this->nextion_->show_component(name_to_send.c_str());
+      this->send_state_to_nextion();
+    } else {
+      this->nextion_->hide_component(name_to_send.c_str());
       return;
     }
-    this->send_state_to_nextion();
   }
 
   if (this->component_flags_.bco_needs_update || (force_update && this->component_flags_.bco2_is_set)) {

esphome/components/nextion/nextion_upload_arduino.cpp

@@ -174,6 +174,11 @@ bool Nextion::upload_tft(uint32_t baud_rate, bool exit_reparse) {
 
   // Check if baud rate is supported
   this->original_baud_rate_ = this->parent_->get_baud_rate();
+  static const std::vector<uint32_t> SUPPORTED_BAUD_RATES = {2400,   4800,   9600,   19200,  31250,  38400, 57600,
+                                                             115200, 230400, 250000, 256000, 512000, 921600};
+  if (std::find(SUPPORTED_BAUD_RATES.begin(), SUPPORTED_BAUD_RATES.end(), baud_rate) == SUPPORTED_BAUD_RATES.end()) {
+    baud_rate = this->original_baud_rate_;
+  }
   ESP_LOGD(TAG, "Baud rate: %" PRIu32, baud_rate);
 
   // Define the configuration for the HTTP client

esphome/components/nextion/nextion_upload_idf.cpp

@@ -177,6 +177,11 @@ bool Nextion::upload_tft(uint32_t baud_rate, bool exit_reparse) {
 
   // Check if baud rate is supported
   this->original_baud_rate_ = this->parent_->get_baud_rate();
+  static const std::vector<uint32_t> SUPPORTED_BAUD_RATES = {2400,   4800,   9600,   19200,  31250,  38400, 57600,
+                                                             115200, 230400, 250000, 256000, 512000, 921600};
+  if (std::find(SUPPORTED_BAUD_RATES.begin(), SUPPORTED_BAUD_RATES.end(), baud_rate) == SUPPORTED_BAUD_RATES.end()) {
+    baud_rate = this->original_baud_rate_;
+  }
   ESP_LOGD(TAG, "Baud rate: %" PRIu32, baud_rate);
 
   // Define the configuration for the HTTP client

esphome/components/number/__init__.py

@@ -252,10 +252,7 @@ async def setup_number_core_(
     cg.add(var.traits.set_max_value(max_value))
     cg.add(var.traits.set_step(step))
 
-    # Only set if non-default to avoid bloating setup() function
-    # (mode_ is initialized to NUMBER_MODE_AUTO in the header)
-    if config[CONF_MODE] != NumberMode.NUMBER_MODE_AUTO:
-        cg.add(var.traits.set_mode(config[CONF_MODE]))
+    cg.add(var.traits.set_mode(config[CONF_MODE]))
 
     for conf in config.get(CONF_ON_VALUE, []):
         trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], var)

esphome/components/remote_base/__init__.py

@@ -17,7 +17,6 @@ from esphome.const import (
     CONF_FAMILY,
     CONF_GROUP,
     CONF_ID,
-    CONF_INDEX,
     CONF_INVERTED,
     CONF_LEVEL,
     CONF_MAGNITUDE,
@@ -617,49 +616,6 @@ async def dooya_action(var, config, args):
     cg.add(var.set_check(template_))
 
 
-# Dyson
-DysonData, DysonBinarySensor, DysonTrigger, DysonAction, DysonDumper = declare_protocol(
-    "Dyson"
-)
-DYSON_SCHEMA = cv.Schema(
-    {
-        cv.Required(CONF_CODE): cv.hex_uint16_t,
-        cv.Optional(CONF_INDEX, default=0xFF): cv.hex_uint8_t,
-    }
-)
-
-
-@register_binary_sensor("dyson", DysonBinarySensor, DYSON_SCHEMA)
-def dyson_binary_sensor(var, config):
-    cg.add(
-        var.set_data(
-            cg.StructInitializer(
-                DysonData,
-                ("code", config[CONF_CODE]),
-                ("index", config[CONF_INDEX]),
-            )
-        )
-    )
-
-
-@register_trigger("dyson", DysonTrigger, DysonData)
-def dyson_trigger(var, config):
-    pass
-
-
-@register_dumper("dyson", DysonDumper)
-def dyson_dumper(var, config):
-    pass
-
-
-@register_action("dyson", DysonAction, DYSON_SCHEMA)
-async def dyson_action(var, config, args):
-    template_ = await cg.templatable(config[CONF_CODE], args, cg.uint16)
-    cg.add(var.set_code(template_))
-    template_ = await cg.templatable(config[CONF_INDEX], args, cg.uint8)
-    cg.add(var.set_index(template_))
-
-
 # JVC
 JVCData, JVCBinarySensor, JVCTrigger, JVCAction, JVCDumper = declare_protocol("JVC")
 JVC_SCHEMA = cv.Schema({cv.Required(CONF_DATA): cv.hex_uint32_t})

esphome/components/remote_base/dyson_protocol.cpp

@@ -1,71 +0,0 @@
-#include "dyson_protocol.h"
-#include "esphome/core/log.h"
-
-#include <cinttypes>
-
-namespace esphome {
-namespace remote_base {
-
-static const char *const TAG = "remote.dyson";
-
-// pulsewidth [µs]
-constexpr uint32_t PW_MARK_US = 780;
-constexpr uint32_t PW_SHORT_US = 720;
-constexpr uint32_t PW_LONG_US = 1500;
-constexpr uint32_t PW_START_US = 2280;
-
-// MSB of 15 bit dyson code
-constexpr uint16_t MSB_DYSON = (1 << 14);
-
-// required symbols in transmit buffer = (start_symbol + 15 data_symbols)
-constexpr uint32_t N_SYMBOLS_REQ = 2u * (1 + 15);
-
-void DysonProtocol::encode(RemoteTransmitData *dst, const DysonData &data) {
-  uint32_t raw_code = (data.code << 2) + (data.index & 3);
-  dst->set_carrier_frequency(36000);
-  dst->reserve(N_SYMBOLS_REQ + 1);
-  dst->item(PW_START_US, PW_SHORT_US);
-  for (uint16_t mask = MSB_DYSON; mask != 0; mask >>= 1) {
-    if (mask == (mask & raw_code)) {
-      dst->item(PW_MARK_US, PW_LONG_US);
-    } else {
-      dst->item(PW_MARK_US, PW_SHORT_US);
-    }
-  }
-  dst->mark(PW_MARK_US);  // final carrier pulse
-}
-
-optional<DysonData> DysonProtocol::decode(RemoteReceiveData src) {
-  uint32_t n_received = static_cast<uint32_t>(src.size());
-  uint16_t raw_code = 0;
-  DysonData data{
-      .code = 0,
-      .index = 0,
-  };
-  if (n_received < N_SYMBOLS_REQ)
-    return {};  // invalid frame length
-  if (!src.expect_item(PW_START_US, PW_SHORT_US))
-    return {};  // start not found
-  for (uint16_t mask = MSB_DYSON; mask != 0; mask >>= 1) {
-    if (src.expect_item(PW_MARK_US, PW_SHORT_US)) {
-      raw_code &= ~mask;  // zero detected
-    } else if (src.expect_item(PW_MARK_US, PW_LONG_US)) {
-      raw_code |= mask;  // one detected
-    } else {
-      return {};  // invalid data item
-    }
-  }
-  data.code = raw_code >> 2;          // extract button code
-  data.index = raw_code & 3;          // extract rolling index
-  if (src.expect_mark(PW_MARK_US)) {  // check total length
-    return data;
-  }
-  return {};  // frame not complete
-}
-
-void DysonProtocol::dump(const DysonData &data) {
-  ESP_LOGI(TAG, "Dyson: code=0x%x rolling index=%d", data.code, data.index);
-}
-
-}  // namespace remote_base
-}  // namespace esphome

esphome/components/remote_base/dyson_protocol.h

@@ -1,46 +0,0 @@
-#pragma once
-
-#include "remote_base.h"
-
-#include <cinttypes>
-
-namespace esphome {
-namespace remote_base {
-
-static constexpr uint8_t IGNORE_INDEX = 0xFF;
-
-struct DysonData {
-  uint16_t code;  // the button, e.g. power, swing, fan++, ...
-  uint8_t index;  // the rolling index counter
-  bool operator==(const DysonData &rhs) const {
-    if (IGNORE_INDEX == index || IGNORE_INDEX == rhs.index) {
-      return code == rhs.code;
-    }
-    return code == rhs.code && index == rhs.index;
-  }
-};
-
-class DysonProtocol : public RemoteProtocol<DysonData> {
- public:
-  void encode(RemoteTransmitData *dst, const DysonData &data) override;
-  optional<DysonData> decode(RemoteReceiveData src) override;
-  void dump(const DysonData &data) override;
-};
-
-DECLARE_REMOTE_PROTOCOL(Dyson)
-
-template<typename... Ts> class DysonAction : public RemoteTransmitterActionBase<Ts...> {
- public:
-  TEMPLATABLE_VALUE(uint16_t, code)
-  TEMPLATABLE_VALUE(uint8_t, index)
-
-  void encode(RemoteTransmitData *dst, Ts... x) override {
-    DysonData data{};
-    data.code = this->code_.value(x...);
-    data.index = this->index_.value(x...);
-    DysonProtocol().encode(dst, data);
-  }
-};
-
-}  // namespace remote_base
-}  // namespace esphome

esphome/components/select/select.cpp

@@ -1,6 +1,5 @@
 #include "select.h"
 #include "esphome/core/log.h"
-#include <cstring>
 
 namespace esphome {
 namespace select {
@@ -36,7 +35,7 @@ size_t Select::size() const {
 optional<size_t> Select::index_of(const std::string &option) const {
   const auto &options = traits.get_options();
   for (size_t i = 0; i < options.size(); i++) {
-    if (strcmp(options[i], option.c_str()) == 0) {
+    if (options[i] == option) {
       return i;
     }
   }
@@ -54,13 +53,11 @@ optional<size_t> Select::active_index() const {
 optional<std::string> Select::at(size_t index) const {
   if (this->has_index(index)) {
     const auto &options = traits.get_options();
-    return std::string(options.at(index));
+    return options.at(index);
   } else {
     return {};
   }
 }
 
-const char *Select::option_at(size_t index) const { return traits.get_options().at(index); }
-
 }  // namespace select
 }  // namespace esphome

esphome/components/select/select.h

@@ -56,9 +56,6 @@ class Select : public EntityBase {
   /// Return the (optional) option value at the provided index offset.
   optional<std::string> at(size_t index) const;
 
-  /// Return the option value at the provided index offset (as const char* from flash).
-  const char *option_at(size_t index) const;
-
   void add_on_state_callback(std::function<void(std::string, size_t)> &&callback);
 
  protected:

esphome/components/select/select_traits.cpp

@@ -3,16 +3,9 @@
 namespace esphome {
 namespace select {
 
-void SelectTraits::set_options(const std::initializer_list<const char *> &options) { this->options_ = options; }
+void SelectTraits::set_options(std::vector<std::string> options) { this->options_ = std::move(options); }
 
-void SelectTraits::set_options(const FixedVector<const char *> &options) {
-  this->options_.init(options.size());
-  for (size_t i = 0; i < options.size(); i++) {
-    this->options_[i] = options[i];
-  }
-}
-
-const FixedVector<const char *> &SelectTraits::get_options() const { return this->options_; }
+const std::vector<std::string> &SelectTraits::get_options() const { return this->options_; }
 
 }  // namespace select
 }  // namespace esphome

esphome/components/select/select_traits.h

@@ -1,19 +1,18 @@
 #pragma once
 
-#include "esphome/core/helpers.h"
-#include <initializer_list>
+#include <vector>
+#include <string>
 
 namespace esphome {
 namespace select {
 
 class SelectTraits {
  public:
-  void set_options(const std::initializer_list<const char *> &options);
-  void set_options(const FixedVector<const char *> &options);
-  const FixedVector<const char *> &get_options() const;
+  void set_options(std::vector<std::string> options);
+  const std::vector<std::string> &get_options() const;
 
  protected:
-  FixedVector<const char *> options_;
+  std::vector<std::string> options_;
 };
 
 }  // namespace select

esphome/components/sensor/__init__.py

@@ -261,7 +261,6 @@ ExponentialMovingAverageFilter = sensor_ns.class_(
 )
 ThrottleAverageFilter = sensor_ns.class_("ThrottleAverageFilter", Filter, cg.Component)
 LambdaFilter = sensor_ns.class_("LambdaFilter", Filter)
-StatelessLambdaFilter = sensor_ns.class_("StatelessLambdaFilter", Filter)
 OffsetFilter = sensor_ns.class_("OffsetFilter", Filter)
 MultiplyFilter = sensor_ns.class_("MultiplyFilter", Filter)
 ValueListFilter = sensor_ns.class_("ValueListFilter", Filter)
@@ -574,7 +573,7 @@ async def lambda_filter_to_code(config, filter_id):
     lambda_ = await cg.process_lambda(
         config, [(float, "x")], return_type=cg.optional.template(float)
     )
-    return automation.new_lambda_pvariable(filter_id, lambda_, StatelessLambdaFilter)
+    return cg.new_Pvariable(filter_id, lambda_)
 
 
 DELTA_SCHEMA = cv.Schema(

esphome/components/sensor/filter.h

@@ -296,21 +296,6 @@ class LambdaFilter : public Filter {
   lambda_filter_t lambda_filter_;
 };
 
-/** Optimized lambda filter for stateless lambdas (no capture).
- *
- * Uses function pointer instead of std::function to reduce memory overhead.
- * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function).
- */
-class StatelessLambdaFilter : public Filter {
- public:
-  explicit StatelessLambdaFilter(optional<float> (*lambda_filter)(float)) : lambda_filter_(lambda_filter) {}
-
-  optional<float> new_value(float value) override { return this->lambda_filter_(value); }
-
- protected:
-  optional<float> (*lambda_filter_)(float);
-};
-
 /// A simple filter that adds `offset` to each value it receives.
 class OffsetFilter : public Filter {
  public:

esphome/components/speed/fan/speed_fan.h

@@ -18,7 +18,7 @@ class SpeedFan : public Component, public fan::Fan {
   void set_output(output::FloatOutput *output) { this->output_ = output; }
   void set_oscillating(output::BinaryOutput *oscillating) { this->oscillating_ = oscillating; }
   void set_direction(output::BinaryOutput *direction) { this->direction_ = direction; }
-  void set_preset_modes(const std::vector<std::string> &presets) { this->preset_modes_ = presets; }
+  void set_preset_modes(const std::set<std::string> &presets) { this->preset_modes_ = presets; }
   fan::FanTraits get_traits() override { return this->traits_; }
 
  protected:
@@ -30,7 +30,7 @@ class SpeedFan : public Component, public fan::Fan {
   output::BinaryOutput *direction_{nullptr};
   int speed_count_{};
   fan::FanTraits traits_;
-  std::vector<std::string> preset_modes_{};
+  std::set<std::string> preset_modes_{};
 };
 
 }  // namespace speed

esphome/components/substitutions/__init__.py

@@ -1,6 +1,4 @@
 import logging
-from re import Match
-from typing import Any
 
 from esphome import core
 from esphome.config_helpers import Extend, Remove, merge_config, merge_dicts_ordered
@@ -41,34 +39,7 @@ async def to_code(config):
     pass
 
 
-def _restore_data_base(value: Any, orig_value: ESPHomeDataBase) -> ESPHomeDataBase:
-    """This function restores ESPHomeDataBase metadata held by the original string.
-    This is needed because during jinja evaluation, strings can be replaced by other types,
-    but we want to keep the original metadata for error reporting and source mapping.
-    For example, if a substitution replaces a string with a dictionary, we want that items
-    in the dictionary to still point to the original document location
-    """
-    if isinstance(value, ESPHomeDataBase):
-        return value
-    if isinstance(value, dict):
-        return {
-            _restore_data_base(k, orig_value): _restore_data_base(v, orig_value)
-            for k, v in value.items()
-        }
-    if isinstance(value, list):
-        return [_restore_data_base(v, orig_value) for v in value]
-    if isinstance(value, str):
-        return make_data_base(value, orig_value)
-    return value
-
-
-def _expand_jinja(
-    value: str | JinjaStr,
-    orig_value: str | JinjaStr,
-    path,
-    jinja: Jinja,
-    ignore_missing: bool,
-) -> Any:
+def _expand_jinja(value, orig_value, path, jinja, ignore_missing):
     if has_jinja(value):
         # If the original value passed in to this function is a JinjaStr, it means it contains an unresolved
         # Jinja expression from a previous pass.
@@ -94,17 +65,10 @@ def _expand_jinja(
                 f"\nSee {'->'.join(str(x) for x in path)}",
                 path,
             )
-        # If the original, unexpanded string, contained document metadata (ESPHomeDatabase),
-        # assign this same document metadata to the resulting value.
-        if isinstance(orig_value, ESPHomeDataBase):
-            value = _restore_data_base(value, orig_value)
-
     return value
 
 
-def _expand_substitutions(
-    substitutions: dict, value: str, path, jinja: Jinja, ignore_missing: bool
-) -> Any:
+def _expand_substitutions(substitutions, value, path, jinja, ignore_missing):
     if "$" not in value:
         return value
 
@@ -112,14 +76,14 @@ def _expand_substitutions(
 
     i = 0
     while True:
-        m: Match[str] = cv.VARIABLE_PROG.search(value, i)
+        m = cv.VARIABLE_PROG.search(value, i)
         if not m:
             # No more variable substitutions found. See if the remainder looks like a jinja template
             value = _expand_jinja(value, orig_value, path, jinja, ignore_missing)
             break
 
         i, j = m.span(0)
-        name: str = m.group(1)
+        name = m.group(1)
         if name.startswith("{") and name.endswith("}"):
             name = name[1:-1]
         if name not in substitutions:
@@ -134,7 +98,7 @@ def _expand_substitutions(
             i = j
             continue
 
-        sub: Any = substitutions[name]
+        sub = substitutions[name]
 
         if i == 0 and j == len(value):
             # The variable spans the whole expression, e.g., "${varName}". Return its resolved value directly
@@ -157,13 +121,7 @@ def _expand_substitutions(
     return value
 
 
-def _substitute_item(
-    substitutions: dict,
-    item: Any,
-    path: list[int | str],
-    jinja: Jinja,
-    ignore_missing: bool,
-) -> Any | None:
+def _substitute_item(substitutions, item, path, jinja, ignore_missing):
     if isinstance(item, ESPLiteralValue):
         return None  # do not substitute inside literal blocks
     if isinstance(item, list):
@@ -202,9 +160,7 @@ def _substitute_item(
     return None
 
 
-def do_substitution_pass(
-    config: dict, command_line_substitutions: dict, ignore_missing: bool = False
-) -> None:
+def do_substitution_pass(config, command_line_substitutions, ignore_missing=False):
     if CONF_SUBSTITUTIONS not in config and not command_line_substitutions:
         return
 

esphome/components/substitutions/jinja.py

@@ -1,14 +1,10 @@
 from ast import literal_eval
-from collections.abc import Iterator
-from itertools import chain, islice
 import logging
 import math
 import re
-from types import GeneratorType
-from typing import Any
 
 import jinja2 as jinja
-from jinja2.nativetypes import NativeCodeGenerator, NativeTemplate
+from jinja2.sandbox import SandboxedEnvironment
 
 from esphome.yaml_util import ESPLiteralValue
 
@@ -28,7 +24,7 @@ detect_jinja_re = re.compile(
 )
 
 
-def has_jinja(st: str) -> bool:
+def has_jinja(st):
     return detect_jinja_re.search(st) is not None
 
 
@@ -113,56 +109,12 @@ class TrackerContext(jinja.runtime.Context):
         return val
 
 
-def _concat_nodes_override(values: Iterator[Any]) -> Any:
-    """
-    This function customizes how Jinja preserves native types when concatenating
-    multiple result nodes together. If the result is a single node, its value
-    is returned. Otherwise, the nodes are concatenated as strings. If
-    the result can be parsed with `ast.literal_eval`, the parsed
-    value is returned. Otherwise, the string is returned.
-    This helps preserve metadata such as ESPHomeDataBase from original values
-    and mimicks how HomeAssistant deals with template evaluation and preserving
-    the original datatype.
-    """
-    head: list[Any] = list(islice(values, 2))
-
-    if not head:
-        return None
-
-    if len(head) == 1:
-        raw = head[0]
-        if not isinstance(raw, str):
-            return raw
-    else:
-        if isinstance(values, GeneratorType):
-            values = chain(head, values)
-        raw = "".join([str(v) for v in values])
-
-    try:
-        # Attempt to parse the concatenated string into a Python literal.
-        # This allows expressions like "1 + 2" to be evaluated to the integer 3.
-        # If the result is also a string or there is a parsing error,
-        # fall back to returning the raw string. This is consistent with
-        #  Home Assistant's behavior when evaluating templates
-        result = literal_eval(raw)
-        if not isinstance(result, str):
-            return result
-
-    except (ValueError, SyntaxError, MemoryError, TypeError):
-        pass
-    return raw
-
-
-class Jinja(jinja.Environment):
+class Jinja(SandboxedEnvironment):
     """
     Wraps a Jinja environment
     """
 
-    # jinja environment customization overrides
-    code_generator_class = NativeCodeGenerator
-    concat = staticmethod(_concat_nodes_override)
-
-    def __init__(self, context_vars: dict):
+    def __init__(self, context_vars):
         super().__init__(
             trim_blocks=True,
             lstrip_blocks=True,
@@ -190,10 +142,19 @@ class Jinja(jinja.Environment):
             **SAFE_GLOBALS,
         }
 
-    def expand(self, content_str: str | JinjaStr) -> Any:
+    def safe_eval(self, expr):
+        try:
+            result = literal_eval(expr)
+            if not isinstance(result, str):
+                return result
+        except (ValueError, SyntaxError, MemoryError, TypeError):
+            pass
+        return expr
+
+    def expand(self, content_str):
         """
         Renders a string that may contain Jinja expressions or statements
-        Returns the resulting value if all variables and expressions could be resolved.
+        Returns the resulting processed string if all values could be resolved.
         Otherwise, it returns a tagged (JinjaStr) string that captures variables
         in scope (upvalues), like a closure for later evaluation.
         """
@@ -211,7 +172,7 @@ class Jinja(jinja.Environment):
         self.context_trace = {}
         try:
             template = self.from_string(content_str)
-            result = template.render(override_vars)
+            result = self.safe_eval(template.render(override_vars))
             if isinstance(result, Undefined):
                 print("" + result)  # force a UndefinedError exception
         except (TemplateSyntaxError, UndefinedError) as err:
@@ -240,10 +201,3 @@ class Jinja(jinja.Environment):
             content_str.result = result
 
         return result, None
-
-
-class JinjaTemplate(NativeTemplate):
-    environment_class = Jinja
-
-
-Jinja.template_class = JinjaTemplate

esphome/components/template/binary_sensor/__init__.py

@@ -10,6 +10,9 @@ from .. import template_ns
 TemplateBinarySensor = template_ns.class_(
     "TemplateBinarySensor", binary_sensor.BinarySensor, cg.Component
 )
+StatelessTemplateBinarySensor = template_ns.class_(
+    "StatelessTemplateBinarySensor", binary_sensor.BinarySensor, cg.Component
+)
 
 CONFIG_SCHEMA = (
     binary_sensor.binary_sensor_schema(TemplateBinarySensor)
@@ -26,28 +29,33 @@ CONFIG_SCHEMA = (
 
 
 async def to_code(config):
-    var = await binary_sensor.new_binary_sensor(config)
-    await cg.register_component(var, config)
-
+    # Check if we have a lambda first - determines which class to instantiate
     if lamb := config.get(CONF_LAMBDA):
+        # Use new_lambda_pvariable to create either TemplateBinarySensor or StatelessTemplateBinarySensor
         template_ = await cg.process_lambda(
             lamb, [], return_type=cg.optional.template(bool)
         )
-        cg.add(var.set_template(template_))
-    if condition := config.get(CONF_CONDITION):
+        var = automation.new_lambda_pvariable(
+            config[CONF_ID], template_, StatelessTemplateBinarySensor
+        )
+        # Manually register as binary sensor since we didn't use new_binary_sensor
+        await binary_sensor.register_binary_sensor(var, config)
+        await cg.register_component(var, config)
+    elif condition := config.get(CONF_CONDITION):
+        # For conditions, create stateful version and set template
+        var = await binary_sensor.new_binary_sensor(config)
+        await cg.register_component(var, config)
         condition = await automation.build_condition(
             condition, cg.TemplateArguments(), []
         )
-        # Generate a stateless lambda that calls condition.check()
-        # capture="" is safe because condition is a global variable in generated C++ code
-        # and doesn't need to be captured. This allows implicit conversion to function pointer.
         template_ = LambdaExpression(
-            f"return {condition.check()};",
-            [],
-            return_type=cg.optional.template(bool),
-            capture="",
+            f"return {condition.check()};", [], return_type=cg.optional.template(bool)
         )
         cg.add(var.set_template(template_))
+    else:
+        # No lambda or condition - just create the base template sensor
+        var = await binary_sensor.new_binary_sensor(config)
+        await cg.register_component(var, config)
 
 
 @automation.register_action(

esphome/components/template/binary_sensor/template_binary_sensor.cpp

@@ -6,18 +6,13 @@ namespace template_ {
 
 static const char *const TAG = "template.binary_sensor";
 
-void TemplateBinarySensor::setup() { this->loop(); }
-
-void TemplateBinarySensor::loop() {
-  if (!this->f_.has_value())
-    return;
-
-  auto s = (*this->f_)();
-  if (s.has_value()) {
-    this->publish_state(*s);
-  }
+// Template instantiations
+template<typename F> void TemplateBinarySensorBase<F>::dump_config() {
+  LOG_BINARY_SENSOR("", "Template Binary Sensor", this);
 }
-void TemplateBinarySensor::dump_config() { LOG_BINARY_SENSOR("", "Template Binary Sensor", this); }
+
+template class TemplateBinarySensorBase<std::function<optional<bool>()>>;
+template class TemplateBinarySensorBase<optional<bool> (*)()>;
 
 }  // namespace template_
 }  // namespace esphome

esphome/components/template/binary_sensor/template_binary_sensor.h

@@ -6,18 +6,41 @@
 namespace esphome {
 namespace template_ {
 
-class TemplateBinarySensor : public Component, public binary_sensor::BinarySensor {
+template<typename F> class TemplateBinarySensorBase : public Component, public binary_sensor::BinarySensor {
  public:
-  void set_template(optional<bool> (*f)()) { this->f_ = f; }
+  void setup() override { this->loop(); }
+
+  void loop() override {
+    if (this->f_ == nullptr)
+      return;
+    auto s = this->f_();
+    if (s.has_value()) {
+      this->publish_state(*s);
+    }
+  }
 
-  void setup() override;
-  void loop() override;
   void dump_config() override;
 
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
 
  protected:
-  optional<optional<bool> (*)()> f_;
+  F f_;
+};
+
+class TemplateBinarySensor : public TemplateBinarySensorBase<std::function<optional<bool>()>> {
+ public:
+  TemplateBinarySensor() { this->f_ = nullptr; }
+  void set_template(std::function<optional<bool>()> &&f) { this->f_ = f; }
+};
+
+/** Optimized template binary sensor for stateless lambdas (no capture).
+ *
+ * Uses function pointer instead of std::function to reduce memory overhead.
+ * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function).
+ */
+class StatelessTemplateBinarySensor : public TemplateBinarySensorBase<optional<bool> (*)()> {
+ public:
+  explicit StatelessTemplateBinarySensor(optional<bool> (*f)()) { this->f_ = f; }
 };
 
 }  // namespace template_

esphome/components/template/cover/__init__.py

@@ -23,6 +23,9 @@ from esphome.const import (
 from .. import template_ns
 
 TemplateCover = template_ns.class_("TemplateCover", cover.Cover, cg.Component)
+StatelessTemplateCover = template_ns.class_(
+    "StatelessTemplateCover", cover.Cover, cg.Component
+)
 
 TemplateCoverRestoreMode = template_ns.enum("TemplateCoverRestoreMode")
 RESTORE_MODES = {
@@ -63,13 +66,22 @@ CONFIG_SCHEMA = (
 
 
 async def to_code(config):
-    var = await cover.new_cover(config)
-    await cg.register_component(var, config)
     if CONF_LAMBDA in config:
+        # Use new_lambda_pvariable to create either TemplateCover or StatelessTemplateCover
         template_ = await cg.process_lambda(
             config[CONF_LAMBDA], [], return_type=cg.optional.template(float)
         )
-        cg.add(var.set_state_lambda(template_))
+        var = automation.new_lambda_pvariable(
+            config[CONF_ID], template_, StatelessTemplateCover
+        )
+        # Manually register as cover since we didn't use new_cover
+        await cover.register_cover(var, config)
+        await cg.register_component(var, config)
+    else:
+        # No state lambda - just create the base template cover
+        var = await cover.new_cover(config)
+        await cg.register_component(var, config)
+
     if CONF_OPEN_ACTION in config:
         await automation.build_automation(
             var.get_open_trigger(), [], config[CONF_OPEN_ACTION]

esphome/components/template/cover/template_cover.cpp

@@ -8,14 +8,8 @@ using namespace esphome::cover;
 
 static const char *const TAG = "template.cover";
 
-TemplateCover::TemplateCover()
-    : open_trigger_(new Trigger<>()),
-      close_trigger_(new Trigger<>),
-      stop_trigger_(new Trigger<>()),
-      toggle_trigger_(new Trigger<>()),
-      position_trigger_(new Trigger<float>()),
-      tilt_trigger_(new Trigger<float>()) {}
-void TemplateCover::setup() {
+// Template instantiations
+template<typename StateF, typename TiltF> void TemplateCoverBase<StateF, TiltF>::setup() {
   switch (this->restore_mode_) {
     case COVER_NO_RESTORE:
       break;
@@ -34,43 +28,12 @@ void TemplateCover::setup() {
     }
   }
 }
-void TemplateCover::loop() {
-  bool changed = false;
 
-  if (this->state_f_.has_value()) {
-    auto s = (*this->state_f_)();
-    if (s.has_value()) {
-      auto pos = clamp(*s, 0.0f, 1.0f);
-      if (pos != this->position) {
-        this->position = pos;
-        changed = true;
-      }
-    }
-  }
-  if (this->tilt_f_.has_value()) {
-    auto s = (*this->tilt_f_)();
-    if (s.has_value()) {
-      auto tilt = clamp(*s, 0.0f, 1.0f);
-      if (tilt != this->tilt) {
-        this->tilt = tilt;
-        changed = true;
-      }
-    }
-  }
-
-  if (changed)
-    this->publish_state();
+template<typename StateF, typename TiltF> void TemplateCoverBase<StateF, TiltF>::dump_config() {
+  LOG_COVER("", "Template Cover", this);
 }
-void TemplateCover::set_optimistic(bool optimistic) { this->optimistic_ = optimistic; }
-void TemplateCover::set_assumed_state(bool assumed_state) { this->assumed_state_ = assumed_state; }
-void TemplateCover::set_state_lambda(optional<float> (*f)()) { this->state_f_ = f; }
-float TemplateCover::get_setup_priority() const { return setup_priority::HARDWARE; }
-Trigger<> *TemplateCover::get_open_trigger() const { return this->open_trigger_; }
-Trigger<> *TemplateCover::get_close_trigger() const { return this->close_trigger_; }
-Trigger<> *TemplateCover::get_stop_trigger() const { return this->stop_trigger_; }
-Trigger<> *TemplateCover::get_toggle_trigger() const { return this->toggle_trigger_; }
-void TemplateCover::dump_config() { LOG_COVER("", "Template Cover", this); }
-void TemplateCover::control(const CoverCall &call) {
+
+template<typename StateF, typename TiltF> void TemplateCoverBase<StateF, TiltF>::control(const CoverCall &call) {
   if (call.get_stop()) {
     this->stop_prev_trigger_();
     this->stop_trigger_->trigger();
@@ -113,7 +76,8 @@ void TemplateCover::control(const CoverCall &call) {
 
   this->publish_state();
 }
-CoverTraits TemplateCover::get_traits() {
+
+template<typename StateF, typename TiltF> CoverTraits TemplateCoverBase<StateF, TiltF>::get_traits() {
   auto traits = CoverTraits();
   traits.set_is_assumed_state(this->assumed_state_);
   traits.set_supports_stop(this->has_stop_);
@@ -122,19 +86,16 @@ CoverTraits TemplateCover::get_traits() {
   traits.set_supports_tilt(this->has_tilt_);
   return traits;
 }
-Trigger<float> *TemplateCover::get_position_trigger() const { return this->position_trigger_; }
-Trigger<float> *TemplateCover::get_tilt_trigger() const { return this->tilt_trigger_; }
-void TemplateCover::set_tilt_lambda(optional<float> (*tilt_f)()) { this->tilt_f_ = tilt_f; }
-void TemplateCover::set_has_stop(bool has_stop) { this->has_stop_ = has_stop; }
-void TemplateCover::set_has_toggle(bool has_toggle) { this->has_toggle_ = has_toggle; }
-void TemplateCover::set_has_position(bool has_position) { this->has_position_ = has_position; }
-void TemplateCover::set_has_tilt(bool has_tilt) { this->has_tilt_ = has_tilt; }
-void TemplateCover::stop_prev_trigger_() {
+
+template<typename StateF, typename TiltF> void TemplateCoverBase<StateF, TiltF>::stop_prev_trigger_() {
   if (this->prev_command_trigger_ != nullptr) {
     this->prev_command_trigger_->stop_action();
     this->prev_command_trigger_ = nullptr;
   }
 }
 
+template class TemplateCoverBase<std::function<optional<float>()>, std::function<optional<float>()>>;
+template class TemplateCoverBase<optional<float> (*)(), optional<float> (*)()>;
+
 }  // namespace template_
 }  // namespace esphome

esphome/components/template/cover/template_cover.h

@@ -13,31 +13,59 @@ enum TemplateCoverRestoreMode {
   COVER_RESTORE_AND_CALL,
 };
 
-class TemplateCover : public cover::Cover, public Component {
+template<typename StateF, typename TiltF> class TemplateCoverBase : public cover::Cover, public Component {
  public:
-  TemplateCover();
+  TemplateCoverBase()
+      : open_trigger_(new Trigger<>()),
+        close_trigger_(new Trigger<>()),
+        stop_trigger_(new Trigger<>()),
+        toggle_trigger_(new Trigger<>()),
+        position_trigger_(new Trigger<float>()),
+        tilt_trigger_(new Trigger<float>()) {}
 
-  void set_state_lambda(optional<float> (*f)());
-  Trigger<> *get_open_trigger() const;
-  Trigger<> *get_close_trigger() const;
-  Trigger<> *get_stop_trigger() const;
-  Trigger<> *get_toggle_trigger() const;
-  Trigger<float> *get_position_trigger() const;
-  Trigger<float> *get_tilt_trigger() const;
-  void set_optimistic(bool optimistic);
-  void set_assumed_state(bool assumed_state);
-  void set_tilt_lambda(optional<float> (*tilt_f)());
-  void set_has_stop(bool has_stop);
-  void set_has_position(bool has_position);
-  void set_has_tilt(bool has_tilt);
-  void set_has_toggle(bool has_toggle);
-  void set_restore_mode(TemplateCoverRestoreMode restore_mode) { restore_mode_ = restore_mode; }
+  void loop() override {
+    bool changed = false;
+    if (this->state_f_.has_value()) {
+      auto s = (*this->state_f_)();
+      if (s.has_value()) {
+        auto pos = clamp(*s, 0.0f, 1.0f);
+        if (pos != this->position) {
+          this->position = pos;
+          changed = true;
+        }
+      }
+    }
+    if (this->tilt_f_.has_value()) {
+      auto s = (*this->tilt_f_)();
+      if (s.has_value()) {
+        auto tilt = clamp(*s, 0.0f, 1.0f);
+        if (tilt != this->tilt) {
+          this->tilt = tilt;
+          changed = true;
+        }
+      }
+    }
+    if (changed)
+      this->publish_state();
+  }
 
   void setup() override;
-  void loop() override;
   void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
 
-  float get_setup_priority() const override;
+  Trigger<> *get_open_trigger() const { return this->open_trigger_; }
+  Trigger<> *get_close_trigger() const { return this->close_trigger_; }
+  Trigger<> *get_stop_trigger() const { return this->stop_trigger_; }
+  Trigger<> *get_toggle_trigger() const { return this->toggle_trigger_; }
+  Trigger<float> *get_position_trigger() const { return this->position_trigger_; }
+  Trigger<float> *get_tilt_trigger() const { return this->tilt_trigger_; }
+  void set_optimistic(bool optimistic) { this->optimistic_ = optimistic; }
+  void set_assumed_state(bool assumed_state) { this->assumed_state_ = assumed_state; }
+  void set_has_stop(bool has_stop) { this->has_stop_ = has_stop; }
+  void set_has_position(bool has_position) { this->has_position_ = has_position; }
+  void set_has_tilt(bool has_tilt) { this->has_tilt_ = has_tilt; }
+  void set_has_toggle(bool has_toggle) { this->has_toggle_ = has_toggle; }
+  void set_restore_mode(TemplateCoverRestoreMode restore_mode) { restore_mode_ = restore_mode; }
 
  protected:
   void control(const cover::CoverCall &call) override;
@@ -45,8 +73,8 @@ class TemplateCover : public cover::Cover, public Component {
   void stop_prev_trigger_();
 
   TemplateCoverRestoreMode restore_mode_{COVER_RESTORE};
-  optional<optional<float> (*)()> state_f_;
-  optional<optional<float> (*)()> tilt_f_;
+  optional<StateF> state_f_;
+  optional<TiltF> tilt_f_;
   bool assumed_state_{false};
   bool optimistic_{false};
   Trigger<> *open_trigger_;
@@ -62,5 +90,22 @@ class TemplateCover : public cover::Cover, public Component {
   bool has_tilt_{false};
 };
 
+class TemplateCover : public TemplateCoverBase<std::function<optional<float>()>, std::function<optional<float>()>> {
+ public:
+  void set_state_lambda(std::function<optional<float>()> &&f) { this->state_f_ = f; }
+  void set_tilt_lambda(std::function<optional<float>()> &&tilt_f) { this->tilt_f_ = tilt_f; }
+};
+
+/** Optimized template cover for stateless lambdas (no capture).
+ *
+ * Uses function pointers instead of std::function to reduce memory overhead.
+ * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function) per lambda.
+ */
+class StatelessTemplateCover : public TemplateCoverBase<optional<float> (*)(), optional<float> (*)()> {
+ public:
+  explicit StatelessTemplateCover(optional<float> (*state_f)()) { this->state_f_ = state_f; }
+  void set_tilt_lambda(optional<float> (*tilt_f)()) { this->tilt_f_ = tilt_f; }
+};
+
 }  // namespace template_
 }  // namespace esphome

esphome/components/template/datetime/__init__.py

@@ -5,6 +5,7 @@ import esphome.config_validation as cv
 from esphome.const import (
     CONF_DAY,
     CONF_HOUR,
+    CONF_ID,
     CONF_INITIAL_VALUE,
     CONF_LAMBDA,
     CONF_MINUTE,
@@ -25,14 +26,23 @@ CODEOWNERS = ["@rfdarter"]
 TemplateDate = template_ns.class_(
     "TemplateDate", datetime.DateEntity, cg.PollingComponent
 )
+StatelessTemplateDate = template_ns.class_(
+    "StatelessTemplateDate", datetime.DateEntity, cg.PollingComponent
+)
 
 TemplateTime = template_ns.class_(
     "TemplateTime", datetime.TimeEntity, cg.PollingComponent
 )
+StatelessTemplateTime = template_ns.class_(
+    "StatelessTemplateTime", datetime.TimeEntity, cg.PollingComponent
+)
 
 TemplateDateTime = template_ns.class_(
     "TemplateDateTime", datetime.DateTimeEntity, cg.PollingComponent
 )
+StatelessTemplateDateTime = template_ns.class_(
+    "StatelessTemplateDateTime", datetime.DateTimeEntity, cg.PollingComponent
+)
 
 
 def validate(config):
@@ -99,15 +109,30 @@ CONFIG_SCHEMA = cv.All(
 
 
 async def to_code(config):
-    var = await datetime.new_datetime(config)
-
     if CONF_LAMBDA in config:
+        # Use new_lambda_pvariable to create either Template* or StatelessTemplate*
         template_ = await cg.process_lambda(
             config[CONF_LAMBDA], [], return_type=cg.optional.template(cg.ESPTime)
         )
-        cg.add(var.set_template(template_))
+        # Determine the appropriate stateless class based on type
+        if config[CONF_TYPE] == "DATE":
+            stateless_class = StatelessTemplateDate
+        elif config[CONF_TYPE] == "TIME":
+            stateless_class = StatelessTemplateTime
+        else:  # DATETIME
+            stateless_class = StatelessTemplateDateTime
 
+        var = automation.new_lambda_pvariable(
+            config[CONF_ID], template_, stateless_class
+        )
+        # Manually register as datetime since we didn't use new_datetime
+        await datetime.register_datetime(var, config)
+        await cg.register_component(var, config)
     else:
+        # No lambda - just create the base template datetime
+        var = await datetime.new_datetime(config)
+        await cg.register_component(var, config)
+
         cg.add(var.set_optimistic(config[CONF_OPTIMISTIC]))
         cg.add(var.set_restore_value(config[CONF_RESTORE_VALUE]))
 
@@ -146,5 +171,3 @@ async def to_code(config):
             [(cg.ESPTime, "x")],
             config[CONF_SET_ACTION],
         )
-
-    await cg.register_component(var, config)

esphome/components/template/datetime/template_date.cpp

@@ -9,7 +9,8 @@ namespace template_ {
 
 static const char *const TAG = "template.date";
 
-void TemplateDate::setup() {
+// Template instantiations
+template<typename F> void TemplateDateBase<F>::setup() {
   if (this->f_.has_value())
     return;
 
@@ -36,21 +37,7 @@ void TemplateDate::setup() {
   this->publish_state();
 }
 
-void TemplateDate::update() {
-  if (!this->f_.has_value())
-    return;
-
-  auto val = (*this->f_)();
-  if (!val.has_value())
-    return;
-
-  this->year_ = val->year;
-  this->month_ = val->month;
-  this->day_ = val->day_of_month;
-  this->publish_state();
-}
-
-void TemplateDate::control(const datetime::DateCall &call) {
+template<typename F> void TemplateDateBase<F>::control(const datetime::DateCall &call) {
   bool has_year = call.get_year().has_value();
   bool has_month = call.get_month().has_value();
   bool has_day = call.get_day().has_value();
@@ -99,12 +86,15 @@ void TemplateDate::control(const datetime::DateCall &call) {
   }
 }
 
-void TemplateDate::dump_config() {
+template<typename F> void TemplateDateBase<F>::dump_config() {
   LOG_DATETIME_DATE("", "Template Date", this);
   ESP_LOGCONFIG(TAG, "  Optimistic: %s", YESNO(this->optimistic_));
   LOG_UPDATE_INTERVAL(this);
 }
 
+template class TemplateDateBase<std::function<optional<ESPTime>()>>;
+template class TemplateDateBase<optional<ESPTime> (*)()>;
+
 }  // namespace template_
 }  // namespace esphome
 

esphome/components/template/datetime/template_date.h

@@ -13,12 +13,23 @@
 namespace esphome {
 namespace template_ {
 
-class TemplateDate : public datetime::DateEntity, public PollingComponent {
+template<typename F> class TemplateDateBase : public datetime::DateEntity, public PollingComponent {
  public:
-  void set_template(optional<ESPTime> (*f)()) { this->f_ = f; }
+  void update() override {
+    if (!this->f_.has_value())
+      return;
+
+    auto val = (*this->f_)();
+    if (!val.has_value())
+      return;
+
+    this->year_ = val->year;
+    this->month_ = val->month;
+    this->day_ = val->day_of_month;
+    this->publish_state();
+  }
 
   void setup() override;
-  void update() override;
   void dump_config() override;
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
 
@@ -35,11 +46,26 @@ class TemplateDate : public datetime::DateEntity, public PollingComponent {
   ESPTime initial_value_{};
   bool restore_value_{false};
   Trigger<ESPTime> *set_trigger_ = new Trigger<ESPTime>();
-  optional<optional<ESPTime> (*)()> f_;
+  optional<F> f_;
 
   ESPPreferenceObject pref_;
 };
 
+class TemplateDate : public TemplateDateBase<std::function<optional<ESPTime>()>> {
+ public:
+  void set_template(std::function<optional<ESPTime>()> &&f) { this->f_ = f; }
+};
+
+/** Optimized template date for stateless lambdas (no capture).
+ *
+ * Uses function pointers instead of std::function to reduce memory overhead.
+ * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function) per lambda.
+ */
+class StatelessTemplateDate : public TemplateDateBase<optional<ESPTime> (*)()> {
+ public:
+  explicit StatelessTemplateDate(optional<ESPTime> (*f)()) { this->f_ = f; }
+};
+
 }  // namespace template_
 }  // namespace esphome
 

esphome/components/template/datetime/template_datetime.cpp

@@ -9,7 +9,8 @@ namespace template_ {
 
 static const char *const TAG = "template.datetime";
 
-void TemplateDateTime::setup() {
+// Template instantiations
+template<typename F> void TemplateDateTimeBase<F>::setup() {
   if (this->f_.has_value())
     return;
 
@@ -39,24 +40,7 @@ void TemplateDateTime::setup() {
   this->publish_state();
 }
 
-void TemplateDateTime::update() {
-  if (!this->f_.has_value())
-    return;
-
-  auto val = (*this->f_)();
-  if (!val.has_value())
-    return;
-
-  this->year_ = val->year;
-  this->month_ = val->month;
-  this->day_ = val->day_of_month;
-  this->hour_ = val->hour;
-  this->minute_ = val->minute;
-  this->second_ = val->second;
-  this->publish_state();
-}
-
-void TemplateDateTime::control(const datetime::DateTimeCall &call) {
+template<typename F> void TemplateDateTimeBase<F>::control(const datetime::DateTimeCall &call) {
   bool has_year = call.get_year().has_value();
   bool has_month = call.get_month().has_value();
   bool has_day = call.get_day().has_value();
@@ -138,12 +122,15 @@ void TemplateDateTime::control(const datetime::DateTimeCall &call) {
   }
 }
 
-void TemplateDateTime::dump_config() {
+template<typename F> void TemplateDateTimeBase<F>::dump_config() {
   LOG_DATETIME_DATETIME("", "Template DateTime", this);
   ESP_LOGCONFIG(TAG, "  Optimistic: %s", YESNO(this->optimistic_));
   LOG_UPDATE_INTERVAL(this);
 }
 
+template class TemplateDateTimeBase<std::function<optional<ESPTime>()>>;
+template class TemplateDateTimeBase<optional<ESPTime> (*)()>;
+
 }  // namespace template_
 }  // namespace esphome
 

esphome/components/template/datetime/template_datetime.h

@@ -13,12 +13,26 @@
 namespace esphome {
 namespace template_ {
 
-class TemplateDateTime : public datetime::DateTimeEntity, public PollingComponent {
+template<typename F> class TemplateDateTimeBase : public datetime::DateTimeEntity, public PollingComponent {
  public:
-  void set_template(optional<ESPTime> (*f)()) { this->f_ = f; }
+  void update() override {
+    if (!this->f_.has_value())
+      return;
+
+    auto val = (*this->f_)();
+    if (!val.has_value())
+      return;
+
+    this->year_ = val->year;
+    this->month_ = val->month;
+    this->day_ = val->day_of_month;
+    this->hour_ = val->hour;
+    this->minute_ = val->minute;
+    this->second_ = val->second;
+    this->publish_state();
+  }
 
   void setup() override;
-  void update() override;
   void dump_config() override;
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
 
@@ -35,11 +49,26 @@ class TemplateDateTime : public datetime::DateTimeEntity, public PollingComponen
   ESPTime initial_value_{};
   bool restore_value_{false};
   Trigger<ESPTime> *set_trigger_ = new Trigger<ESPTime>();
-  optional<optional<ESPTime> (*)()> f_;
+  optional<F> f_;
 
   ESPPreferenceObject pref_;
 };
 
+class TemplateDateTime : public TemplateDateTimeBase<std::function<optional<ESPTime>()>> {
+ public:
+  void set_template(std::function<optional<ESPTime>()> &&f) { this->f_ = f; }
+};
+
+/** Optimized template datetime for stateless lambdas (no capture).
+ *
+ * Uses function pointers instead of std::function to reduce memory overhead.
+ * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function) per lambda.
+ */
+class StatelessTemplateDateTime : public TemplateDateTimeBase<optional<ESPTime> (*)()> {
+ public:
+  explicit StatelessTemplateDateTime(optional<ESPTime> (*f)()) { this->f_ = f; }
+};
+
 }  // namespace template_
 }  // namespace esphome
 

esphome/components/template/datetime/template_time.cpp

@@ -9,7 +9,8 @@ namespace template_ {
 
 static const char *const TAG = "template.time";
 
-void TemplateTime::setup() {
+// Template instantiations
+template<typename F> void TemplateTimeBase<F>::setup() {
   if (this->f_.has_value())
     return;
 
@@ -36,21 +37,7 @@ void TemplateTime::setup() {
   this->publish_state();
 }
 
-void TemplateTime::update() {
-  if (!this->f_.has_value())
-    return;
-
-  auto val = (*this->f_)();
-  if (!val.has_value())
-    return;
-
-  this->hour_ = val->hour;
-  this->minute_ = val->minute;
-  this->second_ = val->second;
-  this->publish_state();
-}
-
-void TemplateTime::control(const datetime::TimeCall &call) {
+template<typename F> void TemplateTimeBase<F>::control(const datetime::TimeCall &call) {
   bool has_hour = call.get_hour().has_value();
   bool has_minute = call.get_minute().has_value();
   bool has_second = call.get_second().has_value();
@@ -99,12 +86,15 @@ void TemplateTime::control(const datetime::TimeCall &call) {
   }
 }
 
-void TemplateTime::dump_config() {
+template<typename F> void TemplateTimeBase<F>::dump_config() {
   LOG_DATETIME_TIME("", "Template Time", this);
   ESP_LOGCONFIG(TAG, "  Optimistic: %s", YESNO(this->optimistic_));
   LOG_UPDATE_INTERVAL(this);
 }
 
+template class TemplateTimeBase<std::function<optional<ESPTime>()>>;
+template class TemplateTimeBase<optional<ESPTime> (*)()>;
+
 }  // namespace template_
 }  // namespace esphome
 

esphome/components/template/datetime/template_time.h

@@ -13,12 +13,23 @@
 namespace esphome {
 namespace template_ {
 
-class TemplateTime : public datetime::TimeEntity, public PollingComponent {
+template<typename F> class TemplateTimeBase : public datetime::TimeEntity, public PollingComponent {
  public:
-  void set_template(optional<ESPTime> (*f)()) { this->f_ = f; }
+  void update() override {
+    if (!this->f_.has_value())
+      return;
+
+    auto val = (*this->f_)();
+    if (!val.has_value())
+      return;
+
+    this->hour_ = val->hour;
+    this->minute_ = val->minute;
+    this->second_ = val->second;
+    this->publish_state();
+  }
 
   void setup() override;
-  void update() override;
   void dump_config() override;
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
 
@@ -35,11 +46,26 @@ class TemplateTime : public datetime::TimeEntity, public PollingComponent {
   ESPTime initial_value_{};
   bool restore_value_{false};
   Trigger<ESPTime> *set_trigger_ = new Trigger<ESPTime>();
-  optional<optional<ESPTime> (*)()> f_;
+  optional<F> f_;
 
   ESPPreferenceObject pref_;
 };
 
+class TemplateTime : public TemplateTimeBase<std::function<optional<ESPTime>()>> {
+ public:
+  void set_template(std::function<optional<ESPTime>()> &&f) { this->f_ = f; }
+};
+
+/** Optimized template time for stateless lambdas (no capture).
+ *
+ * Uses function pointers instead of std::function to reduce memory overhead.
+ * Memory: 4 bytes (function pointer on 32-bit) vs 32 bytes (std::function) per lambda.
+ */
+class StatelessTemplateTime : public TemplateTimeBase<optional<ESPTime> (*)()> {
+ public:
+  explicit StatelessTemplateTime(optional<ESPTime> (*f)()) { this->f_ = f; }
+};
+
 }  // namespace template_
 }  // namespace esphome
 

esphome/components/template/lock/__init__.py

@@ -16,6 +16,9 @@ from esphome.const import (
 from .. import template_ns
 
 TemplateLock = template_ns.class_("TemplateLock", lock.Lock, cg.Component)
+StatelessTemplateLock = template_ns.class_(
+    "StatelessTemplateLock", lock.Lock, cg.Component
+)
 
 TemplateLockPublishAction = template_ns.class_(
     "TemplateLockPublishAction",
@@ -55,14 +58,22 @@ CONFIG_SCHEMA = cv.All(
 
 
 async def to_code(config):
-    var = await lock.new_lock(config)
-    await cg.register_component(var, config)
-
     if CONF_LAMBDA in config:
+        # Use new_lambda_pvariable to create either TemplateLock or StatelessTemplateLock
         template_ = await cg.process_lambda(
             config[CONF_LAMBDA], [], return_type=cg.optional.template(lock.LockState)
         )
-        cg.add(var.set_state_lambda(template_))
+        var = automation.new_lambda_pvariable(
+            config[CONF_ID], template_, StatelessTemplateLock
+        )
+        # Manually register as lock since we didn't use new_lock
+        await lock.register_lock(var, config)
+        await cg.register_component(var, config)
+    else:
+        # No lambda - just create the base template lock
+        var = await lock.new_lock(config)
+        await cg.register_component(var, config)
+
     if CONF_UNLOCK_ACTION in config:
         await automation.build_automation(
             var.get_unlock_trigger(), [], config[CONF_UNLOCK_ACTION]

esphome/components/template/lock/template_lock.cpp

@@ -8,19 +8,8 @@ using namespace esphome::lock;
 
 static const char *const TAG = "template.lock";
 
-TemplateLock::TemplateLock()
-    : lock_trigger_(new Trigger<>()), unlock_trigger_(new Trigger<>()), open_trigger_(new Trigger<>()) {}
-
-void TemplateLock::loop() {
-  if (!this->f_.has_value())
-    return;
-  auto val = (*this->f_)();
-  if (!val.has_value())
-    return;
-
-  this->publish_state(*val);
-}
-void TemplateLock::control(const lock::LockCall &call) {
+// Template instantiations
+template<typename F> void TemplateLockBase<F>::control(const lock::LockCall &call) {
   if (this->prev_trigger_ != nullptr) {
     this->prev_trigger_->stop_action();
   }
@@ -37,23 +26,22 @@ void TemplateLock::control(const lock::LockCall &call) {
   if (this->optimistic_)
     this->publish_state(state);
 }
-void TemplateLock::open_latch() {
+
+template<typename F> void TemplateLockBase<F>::open_latch() {
   if (this->prev_trigger_ != nullptr) {
     this->prev_trigger_->stop_action();
   }
   this->prev_trigger_ = this->open_trigger_;
   this->open_trigger_->trigger();
 }
-void TemplateLock::set_optimistic(bool optimistic) { this->optimistic_ = optimistic; }
-void TemplateLock::set_state_lambda(optional<lock::LockState> (*f)()) { this->f_ = f; }
-float TemplateLock::get_setup_priority() const { return setup_priority::HARDWARE; }
-Trigger<> *TemplateLock::get_lock_trigger() const { return this->lock_trigger_; }
-Trigger<> *TemplateLock::get_unlock_trigger() const { return this->unlock_trigger_; }
-Trigger<> *TemplateLock::get_open_trigger() const { return this->open_trigger_; }
-void TemplateLock::dump_config() {
+
+template<typename F> void TemplateLockBase<F>::dump_config() {
   LOG_LOCK("", "Template Lock", this);
   ESP_LOGCONFIG(TAG, "  Optimistic: %s", YESNO(this->optimistic_));
 }
 
+template class TemplateLockBase<std::function<optional<lock::LockState>()>>;
+template class TemplateLockBase<optional<lock::LockState> (*)()>;
+
 }  // namespace template_
 }  // namespace esphome