can_require_unsupported.cpp
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//
// cpp14/can_require_unsupported.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/require.hpp"
#include <cassert>
template <int>
struct prop
{
};
template <int>
struct object
{
};
namespace asio {
template<int N, int M>
struct is_applicable_property<object<N>, prop<M> >
{
static constexpr bool value = true;
};
} // namespace asio
int main()
{
static_assert(!asio::can_require_v<object<1>, prop<2>>, "");
static_assert(!asio::can_require_v<object<1>, prop<2>, prop<3>>, "");
static_assert(!asio::can_require_v<object<1>, prop<2>, prop<3>, prop<4>>, "");
static_assert(!asio::can_require_v<const object<1>, prop<2>>, "");
static_assert(!asio::can_require_v<const object<1>, prop<2>, prop<3>>, "");
static_assert(!asio::can_require_v<const object<1>, prop<2>, prop<3>, prop<4>>, "");
}