20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.7 Arithmetic operations [arithmetic.operations]

20.14.7.7 Class template negate [arithmetic.operations.negate]

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template<class T = void> struct negate { 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 negate<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).