std::nontype, std::nontype_t

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(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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Defined in header <utility>
template < auto V >
struct nontype_t { explicit nontype_t( ) = default ; } ;
(1) (since C++26)
template < auto V >
constexpr std:: nontype_t <V> nontype { } ;
(2) (since C++26)
1) The class template std::nontype_t can be used in the constructor's parameter list to match the intended tag.
2) The corresponding std::nontype instance of (1) is a disambiguation argument tag that can be passed to the constructors of std::function_ref to indicate that the contained object should be constructed with the value of the non-type template parameter V

Template parameters

V - non-type template parameter of a structural type.

See also

(C++26)
 non-owning wrapper of any callable object
(class template)
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