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[core] Restore = delete for stateful lambdas in TemplatableFn

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J. Nick Koston
2026-04-07 14:40:32 -10:00
parent 4cc6624cb0
commit 0326b1e93a
1 changed files with 3 additions and 0 deletions
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esphome/core/automation.h
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@@ -54,6 +54,9 @@ template<typename T, typename... X> class TemplatableFn {
std::invocable<F, X...> &&std::convertible_to<std::invoke_result_t<F, X...>, T> &&std::is_empty_v<F>
&&std::default_initializable<F> : f_([](X... x) -> T { return static_cast<T>(F{}(x...)); }) {}
// Reject stateful lambdas (non-empty, i.e. capturing) with a clear error
template<typename F> TemplatableFn(F) requires std::invocable<F, X...> &&(!std::is_empty_v<F>) = delete;
bool has_value() const { return this->f_ != nullptr; }
T value(X... x) const { return this->f_ ? this->f_(x...) : T{}; }