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[core] Fix Callback::create memcpy from function reference (#14995)

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This commit is contained in:
J. Nick Koston
2026-03-22 12:37:46 -10:00
committed by GitHub
parent b2b61bea6a
commit aef987dccf
1 changed files with 4 additions and 1 deletions
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esphome/core/helpers.h
+4 -1
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@@ -1762,7 +1762,10 @@ template<typename... Ts> struct Callback<void(Ts...)> {
// Safe under C++20 (P0593R6): byte copy into aligned storage implicitly // Safe under C++20 (P0593R6): byte copy into aligned storage implicitly
// creates objects of implicit-lifetime types (trivially copyable qualifies). // creates objects of implicit-lifetime types (trivially copyable qualifies).
Callback cb; // fn and ctx are zero-initialized by default Callback cb; // fn and ctx are zero-initialized by default
__builtin_memcpy(&cb.ctx_, &callable, sizeof(DecayF)); // Decay callable to a local variable first. When F is a function reference
// (e.g. void(&)(int)), &callable would point at machine code, not a pointer variable.
DecayF decayed = std::forward<F>(callable);
__builtin_memcpy(&cb.ctx_, &decayed, sizeof(DecayF));
cb.fn_ = [](void *c, Ts... args) { cb.fn_ = [](void *c, Ts... args) {
alignas(DecayF) char buf[sizeof(DecayF)]; alignas(DecayF) char buf[sizeof(DecayF)];
__builtin_memcpy(buf, &c, sizeof(DecayF)); __builtin_memcpy(buf, &c, sizeof(DecayF));