235 lines
7.1 KiB
C++
235 lines
7.1 KiB
C++
//
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// traits/set_value_member.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 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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#ifndef ASIO_TRAITS_SET_VALUE_MEMBER_HPP
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#define ASIO_TRAITS_SET_VALUE_MEMBER_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/detail/variadic_templates.hpp"
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#if defined(ASIO_HAS_DECLTYPE) \
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&& defined(ASIO_HAS_NOEXCEPT) \
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&& defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
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# define ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT 1
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#endif // defined(ASIO_HAS_DECLTYPE)
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// && defined(ASIO_HAS_NOEXCEPT)
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// && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace traits {
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template <typename T, typename Vs, typename = void>
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struct set_value_member_default;
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template <typename T, typename Vs, typename = void>
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struct set_value_member;
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} // namespace traits
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namespace detail {
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struct no_set_value_member
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{
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ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
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ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
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};
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#if defined(ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT)
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template <typename T, typename Vs, typename = void>
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struct set_value_member_trait : no_set_value_member
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{
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};
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename T, typename... Vs>
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struct set_value_member_trait<T, void(Vs...),
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typename void_type<
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decltype(declval<T>().set_value(declval<Vs>()...))
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>::type>
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{
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ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
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using result_type = decltype(
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declval<T>().set_value(declval<Vs>()...));
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ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept(
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declval<T>().set_value(declval<Vs>()...)));
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};
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename T>
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struct set_value_member_trait<T, void(),
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typename void_type<
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decltype(declval<T>().set_value())
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>::type>
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{
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ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
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using result_type = decltype(declval<T>().set_value());
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ASIO_STATIC_CONSTEXPR(bool,
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is_noexcept = noexcept(declval<T>().set_value()));
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};
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_TRAIT_DEF(n) \
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template <typename T, ASIO_VARIADIC_TPARAMS(n)> \
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struct set_value_member_trait<T, void(ASIO_VARIADIC_TARGS(n)), \
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typename void_type< \
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decltype(declval<T>().set_value(ASIO_VARIADIC_DECLVAL(n))) \
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>::type> \
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{ \
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ASIO_STATIC_CONSTEXPR(bool, is_valid = true); \
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\
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using result_type = decltype( \
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declval<T>().set_value(ASIO_VARIADIC_DECLVAL(n))); \
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\
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ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept( \
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declval<T>().set_value(ASIO_VARIADIC_DECLVAL(n)))); \
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}; \
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/**/
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ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_SET_VALUE_MEMBER_TRAIT_DEF)
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_TRAIT_DEF
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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#else // defined(ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT)
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template <typename T, typename Vs, typename = void>
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struct set_value_member_trait;
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#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename T, typename... Vs>
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struct set_value_member_trait<T, void(Vs...)> :
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conditional<
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is_same<T, typename remove_reference<T>::type>::value
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&& conjunction<is_same<Vs, typename decay<Vs>::type>...>::value,
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typename conditional<
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is_same<T, typename add_const<T>::type>::value,
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no_set_value_member,
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traits::set_value_member<typename add_const<T>::type, void(Vs...)>
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>::type,
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traits::set_value_member<
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typename remove_reference<T>::type,
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void(typename decay<Vs>::type...)>
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>::type
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{
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};
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#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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template <typename T>
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struct set_value_member_trait<T, void()> :
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conditional<
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is_same<T, typename remove_reference<T>::type>::value,
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typename conditional<
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is_same<T, typename add_const<T>::type>::value,
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no_set_value_member,
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traits::set_value_member<typename add_const<T>::type, void()>
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>::type,
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traits::set_value_member<typename remove_reference<T>::type, void()>
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>::type
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{
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};
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME(n) \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_##n
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_1 \
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&& is_same<T1, typename decay<T1>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_2 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_1 \
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&& is_same<T2, typename decay<T2>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_3 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_2 \
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&& is_same<T3, typename decay<T3>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_4 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_3 \
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&& is_same<T4, typename decay<T4>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_5 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_4 \
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&& is_same<T5, typename decay<T5>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_6 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_5 \
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&& is_same<T6, typename decay<T6>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_7 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_6 \
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&& is_same<T7, typename decay<T7>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_8 \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_7 \
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&& is_same<T8, typename decay<T8>::type>::value
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#define ASIO_PRIVATE_SET_VALUE_MEMBER_TRAIT_DEF(n) \
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template <typename T, ASIO_VARIADIC_TPARAMS(n)> \
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struct set_value_member_trait<T, void(ASIO_VARIADIC_TARGS(n))> : \
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conditional< \
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is_same<T, typename remove_reference<T>::type>::value \
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ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME(n), \
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typename conditional< \
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is_same<T, typename add_const<T>::type>::value, \
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no_set_value_member, \
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traits::set_value_member< \
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typename add_const<T>::type, \
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void(ASIO_VARIADIC_TARGS(n))> \
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>::type, \
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traits::set_value_member< \
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typename remove_reference<T>::type, \
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void(ASIO_VARIADIC_DECAY(n))> \
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>::type \
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{ \
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}; \
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/**/
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ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_SET_VALUE_MEMBER_TRAIT_DEF)
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_TRAIT_DEF
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_1
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_2
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_3
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_4
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_5
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_6
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_7
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#undef ASIO_PRIVATE_SET_VALUE_MEMBER_IS_SAME_8
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#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
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#endif // defined(ASIO_HAS_DEDUCED_SET_VALUE_MEMBER_TRAIT)
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} // namespace detail
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namespace traits {
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template <typename T, typename Vs, typename>
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struct set_value_member_default :
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detail::set_value_member_trait<T, Vs>
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{
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};
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template <typename T, typename Vs, typename>
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struct set_value_member :
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set_value_member_default<T, Vs>
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{
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};
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} // namespace traits
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_TRAITS_SET_VALUE_MEMBER_HPP
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