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+/*!
+@file
+Defines `boost::hana::symmetric_difference`.
+
+@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_SYMMETRIC_DIFFERENCE_HPP
+#define BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP
+
+#include <boost/hana/fwd/symmetric_difference.hpp>
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+#include <boost/hana/difference.hpp>
+#include <boost/hana/union.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+ //! @cond
+ template <typename Xs, typename Ys>
+ constexpr auto symmetric_difference_t::operator()(Xs&& xs, Ys&& ys) const {
+ using S = typename hana::tag_of<Xs>::type;
+ using SymmetricDifference = BOOST_HANA_DISPATCH_IF(symmetric_difference_impl<S>,
+ true
+ );
+
+ return SymmetricDifference::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys));
+ }
+ //! @endcond
+
+ template <typename S, bool condition>
+ struct symmetric_difference_impl<S, when<condition>> : default_ {
+ template <typename Xs, typename Ys>
+ static constexpr auto apply(Xs&& xs, Ys&& ys) {
+ return hana::union_(
+ hana::difference(xs, ys),
+ hana::difference(ys, xs)
+ );
+ }
+ };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP