63e88f80
 Hu Chunming
提交三方库
|
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
50
51
52
|
/*!
@file
Defines `boost::hana::suffix`.
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_SUFFIX_HPP
#define BOOST_HANA_SUFFIX_HPP
#include <boost/hana/fwd/suffix.hpp>
#include <boost/hana/chain.hpp>
#include <boost/hana/concept/monad_plus.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/functional/partial.hpp>
#include <boost/hana/lift.hpp>
#include <boost/hana/prepend.hpp>
namespace boost { namespace hana {
//! @cond
template <typename Xs, typename Sfx>
constexpr auto suffix_t::operator()(Xs&& xs, Sfx&& sfx) const {
using M = typename hana::tag_of<Xs>::type;
using Suffix = BOOST_HANA_DISPATCH_IF(suffix_impl<M>,
hana::MonadPlus<M>::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::MonadPlus<M>::value,
"hana::suffix(xs, sfx) requires 'xs' to be a MonadPlus");
#endif
return Suffix::apply(static_cast<Xs&&>(xs), static_cast<Sfx&&>(sfx));
}
//! @endcond
template <typename M, bool condition>
struct suffix_impl<M, when<condition>> : default_ {
template <typename Xs, typename Z>
static constexpr auto apply(Xs&& xs, Z&& z) {
return hana::chain(static_cast<Xs&&>(xs),
hana::partial(hana::prepend, hana::lift<M>(static_cast<Z&&>(z))));
}
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_SUFFIX_HPP
|
