[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;

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));

Returns: -std::forward<T>(t).

22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.7 Arithmetic operations [arithmetic.operations]

22.10.7.7 Class template negate [arithmetic.operations.negate]