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+/*!
+@file
+Defines `boost::hana::not_equal`.
+
+@copyright Louis Dionne 2013-2016
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_HANA_NOT_EQUAL_HPP
+#define BOOST_HANA_NOT_EQUAL_HPP
+
+#include <boost/hana/fwd/not_equal.hpp>
+
+#include <boost/hana/concept/comparable.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/to.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/detail/has_common_embedding.hpp>
+#include <boost/hana/detail/nested_to.hpp> // required by fwd decl
+#include <boost/hana/equal.hpp>
+#include <boost/hana/not.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+ //! @cond
+ template <typename X, typename Y>
+ constexpr auto not_equal_t::operator()(X&& x, Y&& y) const {
+ using T = typename hana::tag_of<X>::type;
+ using U = typename hana::tag_of<Y>::type;
+ using NotEqual = not_equal_impl<T, U>;
+ return NotEqual::apply(static_cast<X&&>(x), static_cast<Y&&>(y));
+ }
+ //! @endcond
+
+ template <typename T, typename U, bool condition>
+ struct not_equal_impl<T, U, when<condition>> : default_ {
+ template <typename X, typename Y>
+ static constexpr decltype(auto) apply(X&& x, Y&& y) {
+ return hana::not_(hana::equal(static_cast<X&&>(x),
+ static_cast<Y&&>(y)));
+ }
+ };
+
+ // Cross-type overload
+ template <typename T, typename U>
+ struct not_equal_impl<T, U, when<
+ detail::has_nontrivial_common_embedding<Comparable, T, U>::value
+ >> {
+ using C = typename hana::common<T, U>::type;
+ template <typename X, typename Y>
+ static constexpr decltype(auto) apply(X&& x, Y&& y) {
+ return hana::not_equal(hana::to<C>(static_cast<X&&>(x)),
+ hana::to<C>(static_cast<Y&&>(y)));
+ }
+ };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_NOT_EQUAL_HPP