20 General utilities library [utilities]

20.14.6.1 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;

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));