set_error_member.hpp
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//
// traits/set_error_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 ASIO_TRAITS_SET_ERROR_MEMBER_HPP
#define ASIO_TRAITS_SET_ERROR_MEMBER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/type_traits.hpp"
#if defined(ASIO_HAS_DECLTYPE) \
&& defined(ASIO_HAS_NOEXCEPT) \
&& defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
# define ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT 1
#endif // defined(ASIO_HAS_DECLTYPE)
// && defined(ASIO_HAS_NOEXCEPT)
// && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
#include "asio/detail/push_options.hpp"
namespace asio {
namespace traits {
template <typename T, typename E, typename = void>
struct set_error_member_default;
template <typename T, typename E, typename = void>
struct set_error_member;
} // namespace traits
namespace detail {
struct no_set_error_member
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
};
#if defined(ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT)
template <typename T, typename E, typename = void>
struct set_error_member_trait : no_set_error_member
{
};
template <typename T, typename E>
struct set_error_member_trait<T, E,
typename void_type<
decltype(declval<T>().set_error(declval<E>()))
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
using result_type = decltype(
declval<T>().set_error(declval<E>()));
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept(
declval<T>().set_error(declval<E>())));
};
#else // defined(ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT)
template <typename T, typename E, typename = void>
struct set_error_member_trait :
conditional<
is_same<T, typename remove_reference<T>::type>::value
&& is_same<E, typename decay<E>::type>::value,
typename conditional<
is_same<T, typename add_const<T>::type>::value,
no_set_error_member,
traits::set_error_member<typename add_const<T>::type, E>
>::type,
traits::set_error_member<
typename remove_reference<T>::type,
typename decay<E>::type>
>::type
{
};
#endif // defined(ASIO_HAS_DEDUCED_SET_ERROR_MEMBER_TRAIT)
} // namespace detail
namespace traits {
template <typename T, typename E, typename>
struct set_error_member_default :
detail::set_error_member_trait<T, E>
{
};
template <typename T, typename E, typename>
struct set_error_member :
set_error_member_default<T, E>
{
};
} // namespace traits
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_TRAITS_SET_ERROR_MEMBER_HPP