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/*!
@file
Defines `boost::hana::union`.
@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_UNION_HPP
#define BOOST_HANA_UNION_HPP
#include <boost/hana/fwd/union.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template <typename Xs, typename Ys>
constexpr auto union_t::operator()(Xs&& xs, Ys&& ys) const {
using S = typename hana::tag_of<Xs>::type;
using Union = BOOST_HANA_DISPATCH_IF(union_impl<S>,
true
);
return Union::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys));
}
//! @endcond
template <typename S, bool condition>
struct union_impl<S, when<condition>> : default_ {
template <typename ...Args>
static constexpr auto apply(Args&& ...) = delete;
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_UNION_HPP