[comparisons.equal.to] (original) (raw)

22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.8 Comparisons [comparisons]

22.10.8.2 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;

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));

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