1/*!
2@file
3Defines `boost::hana::fuse`.
4
5Copyright Louis Dionne 2013-2022
6Distributed under the Boost Software License, Version 1.0.
7(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
8 */
9
10#ifndef BOOST_HANA_FUSE_HPP
11#define BOOST_HANA_FUSE_HPP
12
13#include <boost/hana/fwd/fuse.hpp>
14
15#include <boost/hana/config.hpp>
16#include <boost/hana/detail/decay.hpp>
17#include <boost/hana/unpack.hpp>
18
19
20namespace boost { namespace hana {
21 namespace detail {
22 template <typename F>
23 struct fused {
24 F f;
25 template <typename Xs>
26 constexpr decltype(auto) operator()(Xs&& xs) const&
27 { return hana::unpack(static_cast<Xs&&>(xs), f); }
28
29 template <typename Xs>
30 constexpr decltype(auto) operator()(Xs&& xs) &
31 { return hana::unpack(static_cast<Xs&&>(xs), f); }
32
33 template <typename Xs>
34 constexpr decltype(auto) operator()(Xs&& xs) &&
35 { return hana::unpack(static_cast<Xs&&>(xs), static_cast<F&&>(f)); }
36 };
37 }
38
39 //! @cond
40 template <typename F>
41 constexpr auto fuse_t::operator()(F&& f) const {
42 return detail::fused<typename detail::decay<F>::type>{static_cast<F&&>(f)};
43 }
44 //! @endcond
45}} // end namespace boost::hana
46
47#endif // !BOOST_HANA_FUSE_HPP
48

source code of boost/libs/hana/include/boost/hana/fuse.hpp