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+//
+// traits/equality_comparable.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_TRAITS_EQUALITY_COMPARABLE_HPP
+#define ASIO_TRAITS_EQUALITY_COMPARABLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#if defined(ASIO_HAS_DECLTYPE) \
+ && defined(ASIO_HAS_NOEXCEPT) \
+ && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+# define ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT 1
+#endif // defined(ASIO_HAS_DECLTYPE)
+ // && defined(ASIO_HAS_NOEXCEPT)
+ // && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
+
+namespace asio {
+namespace traits {
+
+template <typename T, typename = void>
+struct equality_comparable_default;
+
+template <typename T, typename = void>
+struct equality_comparable;
+
+} // namespace traits
+namespace detail {
+
+struct no_equality_comparable
+{
+ ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
+ ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
+};
+
+#if defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+template <typename T, typename = void>
+struct equality_comparable_trait : no_equality_comparable
+{
+};
+
+template <typename T>
+struct equality_comparable_trait<T,
+ typename void_type<
+ decltype(
+ static_cast<void>(
+ static_cast<bool>(declval<const T>() == declval<const T>())
+ ),
+ static_cast<void>(
+ static_cast<bool>(declval<const T>() != declval<const T>())
+ )
+ )
+ >::type>
+{
+ ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
+
+ ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
+ noexcept(declval<const T>() == declval<const T>())
+ && noexcept(declval<const T>() != declval<const T>()));
+};
+
+#else // defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+template <typename T, typename = void>
+struct equality_comparable_trait :
+ conditional<
+ is_same<T, typename decay<T>::type>::value,
+ no_equality_comparable,
+ traits::equality_comparable<typename decay<T>::type>
+ >::type
+{
+};
+
+#endif // defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
+
+} // namespace detail
+namespace traits {
+
+template <typename T, typename>
+struct equality_comparable_default : detail::equality_comparable_trait<T>
+{
+};
+
+template <typename T, typename>
+struct equality_comparable : equality_comparable_default<T>
+{
+};
+
+} // namespace traits
+} // namespace asio
+
+#endif // ASIO_TRAITS_EQUALITY_COMPARABLE_HPP