20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.7 Arithmetic operations [arithmetic.operations]

20.14.7.2 Class template plus [arithmetic.operations.plus]

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template<class T = void> struct plus { constexpr T operator()(const T& x, const T& y) const; };
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constexpr T operator()(const T& x, const T& y) const;
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Returns: x + y.
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template<> struct plus<void> { template<class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) + std::forward<U>(u)); using is_transparent = unspecified; };
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template<class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) + std::forward<U>(u));
2
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Returns: std​::​forward<T>(t) + std​::​forward<U>(u).