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