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1//
2// cpp11/require_concept_free.cpp
3// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4//
5// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6//
7// Distributed under the Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9//
10
11#include <boost/asio/require_concept.hpp>
12#include <cassert>
13
14template <int>
15struct prop
16{
17 static constexpr bool is_requirable_concept = true;
18};
19
20template <int>
21struct object
22{
23 template <int N>
24 friend constexpr object<N> require_concept(const object&, prop<N>)
25 {
26 return object<N>();
27 }
28};
29
30namespace boost {
31namespace asio {
32
33template<int N, int M>
34struct is_applicable_property<object<N>, prop<M> >
35{
36 static constexpr bool value = true;
37};
38
39} // namespace asio
40} // namespace boost
41
42int main()
43{
44 object<1> o1 = {};
45 object<2> o2 = boost::asio::require_concept(o1, prop<2>());
46 (void)o2;
47
48 const object<1> o3 = {};
49 object<2> o4 = boost::asio::require_concept(o3, prop<2>());
50 (void)o4;
51
52 constexpr object<2> o5 = boost::asio::require_concept(object<1>(), prop<2>());
53 (void)o5;
54}