From 3a06318b6585321bd479e15edd7cdce91ca55c97 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Sun, 4 Oct 2026 18:02:18 -0500
Subject: [PATCH] [template] Use distinct empty types so both unused select
 members take no space (#20141)

---
 esphome/components/template/select/template_select.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/esphome/components/template/select/template_select.h b/esphome/components/template/select/template_select.h
index 1cc28a36d3..c6a1b8bd08 100644
--- a/esphome/components/template/select/template_select.h
+++ b/esphome/components/template/select/template_select.h
@@ -9,7 +9,8 @@
 
 namespace esphome::template_ {
 
-struct Empty {};
+// Distinct per member: two empty members of the same type cannot share an address
+template<int N> struct Empty {};
 class BaseTemplateSelect : public select::Select, public PollingComponent {};
 
 void dump_config_helper(BaseTemplateSelect *sel_comp, bool optimistic, bool has_lambda, size_t initial_option_index,
@@ -59,8 +60,8 @@ class TemplateSelect : public BaseTemplateSelect {
     if constexpr (RESTORE_VALUE)
       this->pref_.save(&index);
   }
-  [[no_unique_address]] std::conditional_t<HAS_LAMBDA, TemplateLambda<std::string>, Empty> f_{};
-  [[no_unique_address]] std::conditional_t<RESTORE_VALUE, ESPPreferenceObject, Empty> pref_{};
+  [[no_unique_address]] std::conditional_t<HAS_LAMBDA, TemplateLambda<std::string>, Empty<0>> f_{};
+  [[no_unique_address]] std::conditional_t<RESTORE_VALUE, ESPPreferenceObject, Empty<1>> pref_{};
 };
 
 /// Template select with set_action trigger - only instantiated when set_action is configured