prefer_static.cpp
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//
// cpp03/prefer_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/prefer.hpp"
#include <cassert>
template <int>
struct prop
{
static const bool is_preferable = true;
};
template <int>
struct object
{
};
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<object<N>, prop<N> >
{
static const bool is_valid = true;
};
} // namespace traits
} // namespace asio
int main()
{
object<1> o1 = {};
object<1> o2 = asio::prefer(o1, prop<1>());
object<1> o3 = asio::prefer(o1, prop<1>(), prop<1>());
object<1> o4 = asio::prefer(o1, prop<1>(), prop<1>(), prop<1>());
(void)o2;
(void)o3;
(void)o4;
const object<1> o5 = {};
object<1> o6 = asio::prefer(o5, prop<1>());
object<1> o7 = asio::prefer(o5, prop<1>(), prop<1>());
object<1> o8 = asio::prefer(o5, prop<1>(), prop<1>(), prop<1>());
(void)o6;
(void)o7;
(void)o8;
}