The library provides basic function object classes for all of the comparison operators in the language ([expr.rel], [expr.eq]).
template <class T = void> struct equal_to { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };
operator() returns x == y.
template <class T = void> struct not_equal_to { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };
operator() returns x != y.
template <class T = void> struct greater { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };
operator() returns x > y.
template <class T = void> struct less { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };
operator() returns x < y.
template <class T = void> struct greater_equal { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };
operator() returns x >= y.
template <class T = void> struct less_equal { constexpr bool operator()(const T& x, const T& y) const; typedef T first_argument_type; typedef T second_argument_type; typedef bool result_type; };
operator() 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)); typedef unspecified is_transparent; };
operator() returns std::forward<T>(t) == std::forward<U>(u).
template <> struct not_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)); typedef unspecified is_transparent; };
operator() returns std::forward<T>(t) != std::forward<U>(u).
template <> struct greater<void> { template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) > std::forward<U>(u)); typedef unspecified is_transparent; };
operator() returns std::forward<T>(t) > std::forward<U>(u).
template <> struct less<void> { template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) < std::forward<U>(u)); typedef unspecified is_transparent; };
operator() returns std::forward<T>(t) < std::forward<U>(u).
template <> struct greater_equal<void> { template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) >= std::forward<U>(u)); typedef unspecified is_transparent; };
operator() returns std::forward<T>(t) >= std::forward<U>(u).
template <> struct less_equal<void> { template <class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) <= std::forward<U>(u)); typedef unspecified is_transparent; };
operator() returns std::forward<T>(t) <= std::forward<U>(u).
For templates greater, less, greater_equal, and less_equal, the specializations for any pointer type yield a total order, even if the built-in operators <, >, <=, >= do not.
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