47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
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/*!
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@file
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Defines `boost::hana::symmetric_difference`.
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@copyright Louis Dionne 2013-2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP
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#define BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP
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#include <boost/hana/fwd/symmetric_difference.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/dispatch.hpp>
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#include <boost/hana/difference.hpp>
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#include <boost/hana/union.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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//! @cond
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template <typename Xs, typename Ys>
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constexpr auto symmetric_difference_t::operator()(Xs&& xs, Ys&& ys) const {
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using S = typename hana::tag_of<Xs>::type;
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using SymmetricDifference = BOOST_HANA_DISPATCH_IF(symmetric_difference_impl<S>,
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true
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);
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return SymmetricDifference::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys));
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}
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//! @endcond
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template <typename S, bool condition>
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struct symmetric_difference_impl<S, when<condition>> : default_ {
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template <typename Xs, typename Ys>
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static constexpr auto apply(Xs&& xs, Ys&& ys) {
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return hana::union_(
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hana::difference(xs, ys),
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hana::difference(ys, xs)
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);
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}
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};
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP
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