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1 | /*! |
2 | @file | |
3 | Forward declares `boost::hana::reverse`. | |
4 | ||
5 | @copyright Louis Dionne 2013-2016 | |
6 | Distributed 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_FWD_REVERSE_HPP | |
11 | #define BOOST_HANA_FWD_REVERSE_HPP | |
12 | ||
13 | #include <boost/hana/config.hpp> | |
14 | #include <boost/hana/core/when.hpp> | |
15 | ||
16 | ||
17 | BOOST_HANA_NAMESPACE_BEGIN | |
18 | //! Reverse a sequence. | |
19 | //! @ingroup group-Sequence | |
20 | //! | |
21 | //! Specifically, `reverse(xs)` is a new sequence containing the same | |
22 | //! elements as `xs`, except in reverse order. | |
23 | //! | |
24 | //! | |
25 | //! @param xs | |
26 | //! The sequence to reverse. | |
27 | //! | |
28 | //! | |
29 | //! Example | |
30 | //! ------- | |
31 | //! @include example/reverse.cpp | |
32 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
33 | constexpr auto reverse = [](auto&& xs) { | |
34 | return tag-dispatched; | |
35 | }; | |
36 | #else | |
37 | template <typename S, typename = void> | |
38 | struct reverse_impl : reverse_impl<S, when<true>> { }; | |
39 | ||
40 | struct reverse_t { | |
41 | template <typename Xs> | |
42 | constexpr auto operator()(Xs&& xs) const; | |
43 | }; | |
44 | ||
45 | constexpr reverse_t reverse{}; | |
46 | #endif | |
47 | BOOST_HANA_NAMESPACE_END | |
48 | ||
49 | #endif // !BOOST_HANA_FWD_REVERSE_HPP |