reverse.hpp
1.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
/*!
@file
Forward declares `boost::hana::reverse`.
Copyright Louis Dionne 2013-2022
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_FWD_REVERSE_HPP
#define BOOST_HANA_FWD_REVERSE_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
namespace boost { namespace hana {
//! Reverse a sequence.
//! @ingroup group-Sequence
//!
//! Specifically, `reverse(xs)` is a new sequence containing the same
//! elements as `xs`, except in reverse order.
//!
//!
//! @param xs
//! The sequence to reverse.
//!
//!
//! Example
//! -------
//! @include example/reverse.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto reverse = [](auto&& xs) {
return tag-dispatched;
};
#else
template <typename S, typename = void>
struct reverse_impl : reverse_impl<S, when<true>> { };
struct reverse_t {
template <typename Xs>
constexpr auto operator()(Xs&& xs) const;
};
BOOST_HANA_INLINE_VARIABLE constexpr reverse_t reverse{};
#endif
}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_REVERSE_HPP