[logical.operations.not] (original) (raw)

20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.10 Logical operations [logical.operations]

20.14.10.4 Class template logical_­not [logical.operations.not]

template<class T = void> struct logical_not { constexpr bool operator()(const T& x) const;};

constexpr bool operator()(const T& x) const;

template<> struct logical_not<void> { template<class T> constexpr auto operator()(T&& t) const -> decltype(!std::forward<T>(t));using is_transparent = _unspecified_;};

template<class T> constexpr auto operator()(T&& t) const -> decltype(!std::forward<T>(t));

Returns: !std​::​forward<T>(t).