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
53
54
55
56
57
|
//
// cpp03/require_concept_static.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/asio/require_concept.hpp>
#include <cassert>
template <int>
struct prop
{
static const bool is_requirable_concept = true;
};
template <int>
struct object
{
};
namespace boost {
namespace asio {
template<int N, int M>
struct is_applicable_property<object<N>, prop<M> >
{
static const bool value = true;
};
namespace traits {
template<int N>
struct static_require_concept<object<N>, prop<N> >
{
static const bool is_valid = true;
};
} // namespace traits
} // namespace asio
} // namespace boost
int main()
{
object<1> o1 = {};
const object<1>& o2 = boost::asio::require_concept(o1, prop<1>());
assert(&o1 == &o2);
(void)o2;
const object<1> o3 = {};
const object<1>& o4 = boost::asio::require_concept(o3, prop<1>());
assert(&o3 == &o4);
(void)o4;
}
|
