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deduction guides for std::function_ref

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(until C++17*)(until C++17*)(until C++17*)(until C++17*)
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(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
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std::function_ref
 
Defined in header <functional>
template< class F >
function_ref( F* ) -> function_ref<F>;
 (1) (since C++26)
template< auto f >
function_ref( std::nontype_t<f> ) -> function_ref</*see below*/>;
 (2) (since C++26)
template< auto f, class T >
function_ref( std::nontype_t<f>, T&& ) -> function_ref</*see below*/>;
 (3) (since C++26)
1) This overload participates in overload resolution only if std::is_function_v<F> is true.
2) Let type F be