query_static.cpp
872 Bytes
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
//
// cpp14/query_static.cpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 "asio/query.hpp"
#include <cassert>
struct prop
{
template <typename> static constexpr bool is_applicable_property_v = true;
template <typename> static constexpr int static_query_v = 123;
};
struct object
{
};
int main()
{
object o1 = {};
int result1 = asio::query(o1, prop());
assert(result1 == 123);
(void)result1;
const object o2 = {};
int result2 = asio::query(o2, prop());
assert(result2 == 123);
(void)result2;
constexpr object o3 = {};
constexpr int result3 = asio::query(o3, prop());
assert(result3 == 123);
(void)result3;
}