From 70733fa9132ae01bf920ac2765d22f8787396e3e Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sun, 15 Mar 2026 22:39:31 -1000
Subject: [PATCH] [core] Fix Callback invocation for function pointer callables

Use (*ptr)(args...) instead of ptr->operator()(args...) so the
inline path works correctly for function pointers, which are
trivially copyable and pointer-sized but lack operator().
---
 esphome/core/helpers.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index 5eab5b475d..efba3aa56e 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -1756,7 +1756,7 @@ template<typename... Ts> struct Callback<void(Ts...)> {
       cb.fn = [](void *c, Ts... args) {
         alignas(DecayF) char buf[sizeof(DecayF)];
         __builtin_memcpy(buf, &c, sizeof(DecayF));
-        reinterpret_cast<DecayF *>(buf)->operator()(args...);
+        (*reinterpret_cast<DecayF *>(buf))(args...);
       };
       return cb;
     } else {