/usr/include/boost/asio/traits
Edit: /usr/include/boost/asio/traits/query_member.hpp (2868B)
//
// traits/query_member.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~
//
// 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)
//
#ifndef BOOST_ASIO_TRAITS_QUERY_MEMBER_HPP
#define BOOST_ASIO_TRAITS_QUERY_MEMBER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include
#include
#if defined(BOOST_ASIO_HAS_DECLTYPE) \
&& defined(BOOST_ASIO_HAS_NOEXCEPT) \
&& defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE)
# define BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT 1
#endif // defined(BOOST_ASIO_HAS_DECLTYPE)
// && defined(BOOST_ASIO_HAS_NOEXCEPT)
// && defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE)
#include
namespace boost {
namespace asio {
namespace traits {
template
struct query_member_default;
template
struct query_member;
} // namespace traits
namespace detail {
struct no_query_member
{
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
};
#if defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
template
struct query_member_trait : no_query_member
{
};
template
struct query_member_trait().query(declval()))
>::type>
{
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
using result_type = decltype(
declval().query(declval()));
BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept(
declval().query(declval())));
};
#else // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
template
struct query_member_trait :
conditional<
is_same::type>::value
&& is_same::type>::value,
no_query_member,
traits::query_member<
typename decay::type,
typename decay::type>
>::type
{
};
#endif // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
} // namespace detail
namespace traits {
template
struct query_member_default :
detail::query_member_trait
{
};
template
struct query_member :
query_member_default
{
};
} // namespace traits
} // namespace asio
} // namespace boost
#include
#endif // BOOST_ASIO_TRAITS_QUERY_MEMBER_HPP