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/*!
@file
Defines `boost::hana::fuse`.
@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_FUSE_HPP
#define BOOST_HANA_FUSE_HPP
#include <boost/hana/fwd/fuse.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/unpack.hpp>
BOOST_HANA_NAMESPACE_BEGIN
namespace detail {
template <typename F>
struct fused {
F f;
template <typename Xs>
constexpr decltype(auto) operator()(Xs&& xs) const&
{ return hana::unpack(static_cast<Xs&&>(xs), f); }
template <typename Xs>
constexpr decltype(auto) operator()(Xs&& xs) &
{ return hana::unpack(static_cast<Xs&&>(xs), f); }
template <typename Xs>
constexpr decltype(auto) operator()(Xs&& xs) &&
{ return hana::unpack(static_cast<Xs&&>(xs), static_cast<F&&>(f)); }
};
}
//! @cond
template <typename F>
constexpr auto fuse_t::operator()(F&& f) const {
return detail::fused<typename detail::decay<F>::type>{static_cast<F&&>(f)};
}
//! @endcond
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FUSE_HPP
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