22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.10 Logical operations [logical.operations]

22.10.10.4 Class template logical_not [logical.operations.not]

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template<class T = void> struct logical_not { constexpr bool operator()(const T& x) const; };
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constexpr bool operator()(const T& x) const;
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#
Returns: !x.
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template<> struct logical_not<void> { template<class T> constexpr auto operator()(T&& t) const -> decltype(!std::forward<T>(t)); using is_transparent = unspecified; };
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template<class T> constexpr auto operator()(T&& t) const -> decltype(!std::forward<T>(t));
2
#
Returns: !std​::​forward<T>(t).