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/*!
@file
Defines `boost::hana::symmetric_difference`.
@copyright Louis Dionne 2013-2017
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
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