23 General utilities library [utilities]

23.14 Function objects [function.objects]

23.14.7 Comparisons [comparisons]

23.14.7.1 Class template equal_­to [comparisons.equal_to]

template <class T = void> struct equal_to { constexpr bool operator()(const T& x, const T& y) const; };

constexpr bool operator()(const T& x, const T& y) const;

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Returns: x == y.

template <> struct equal_to<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; };

template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) == std::forward<U>(u));

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Returns: std​::​forward<T>(t) == std​::​forward<U>(u).