63 lines
1.2 KiB
C++
63 lines
1.2 KiB
C++
//
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// cpp11/query_static.cpp
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// ~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <boost/asio/query.hpp>
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#include <cassert>
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struct prop
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{
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};
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struct object
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{
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};
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namespace boost {
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namespace asio {
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template<>
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struct is_applicable_property<object, prop>
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{
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static constexpr bool value = true;
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};
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namespace traits {
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template<>
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struct static_query<object, prop>
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{
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static constexpr bool is_valid = true;
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static constexpr bool is_noexcept = true;
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typedef int result_type;
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static constexpr int value() { return 123; }
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};
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} // namespace traits
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} // namespace asio
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} // namespace boost
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int main()
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{
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object o1 = {};
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int result1 = boost::asio::query(o1, prop());
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assert(result1 == 123);
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(void)result1;
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const object o2 = {};
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int result2 = boost::asio::query(o2, prop());
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assert(result2 == 123);
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(void)result2;
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constexpr object o3 = {};
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constexpr int result3 = boost::asio::query(o3, prop());
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assert(result3 == 123);
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(void)result3;
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}
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