20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.11 Bitwise operations [bitwise.operations]

20.14.11.5 Class template bit_­not [bitwise.operations.not]

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template<class T = void> struct bit_not { constexpr T operator()(const T& x) const; };
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constexpr T operator()(const T& x) const;
1
#
Returns: ~x.
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template<> struct bit_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&&) const -> decltype(~std::forward<T>(t));
2
#
Returns: ~std​::​forward<T>(t).