Deduces a FunctionRef wrapping a compile‐time known free function.
FunctionRef
Declared in <absl/functional/function_ref.h>
<absl/functional/function_ref.h>
template<auto Func> FunctionRef<std::remove_pointer_t<decltype(Func)>>(nontype_t<Func>) → FunctionRef<std::remove_pointer_t<decltype(Func)>>;
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