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).
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