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// Networking implementation details -*- C++ -*- // Copyright (C) 2015-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file experimental/bits/net.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{experimental/net} */ #ifndef _GLIBCXX_EXPERIMENTAL_NET_H #define _GLIBCXX_EXPERIMENTAL_NET_H 1 #pragma GCC system_header #if __cplusplus >= 201402L #include <type_traits> #include <system_error> #include <experimental/netfwd> #if __cplusplus > 201703L # include <concepts> #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace experimental { namespace net { inline namespace v1 { /** @addtogroup networking-ts * @{ */ template<typename _CompletionToken, typename _Signature, typename> class async_result; /// @cond undocumented // A type denoted by DEDUCED in the TS. template<typename _CompletionToken, typename _Signature> using __deduced_t = typename async_result<decay_t<_CompletionToken>, _Signature, void>::return_type; // Trait to check for construction from const/non-const lvalue/rvalue. template<typename _Tp> using __is_value_constructible = typename __and_< is_copy_constructible<_Tp>, is_move_constructible<_Tp>, is_constructible<_Tp, _Tp&>, is_constructible<_Tp, const _Tp&&> >::type; struct __throw_on_error { explicit __throw_on_error(const char* __msg) : _M_msg(__msg) { } ~__throw_on_error() noexcept(false) { if (_M_ec) _GLIBCXX_THROW_OR_ABORT(system_error(_M_ec, _M_msg)); } __throw_on_error(const __throw_on_error&) = delete; __throw_on_error& operator=(const __throw_on_error&) = delete; operator error_code&() noexcept { return _M_ec; } const char* _M_msg; error_code _M_ec; }; /// @endcond // Base class for types meeting both GettableSocketOption and // SettableSocketOption requirements. // The bool parameter allows __sockopt_base<bool> to have a // __sockopt_base<int, B> base class (so that its _M_value is an int) // but to have that be a distinct type from __sockopt_base<int>. template<typename _Tp, bool = true> struct __sockopt_base { __sockopt_base() = default; explicit __sockopt_base(_Tp __val) noexcept(noexcept(_Tp(std::declval<_Tp&>()))) : _M_value(__val) { } template<typename _Protocol> void* data(const _Protocol&) noexcept { return std::addressof(_M_value); } template<typename _Protocol> const void* data(const _Protocol&) const noexcept { return std::addressof(_M_value); } template<typename _Protocol> size_t size(const _Protocol&) const noexcept { return sizeof(_M_value); } template<typename _Protocol> void resize(const _Protocol&, size_t __s) { if (__s != sizeof(_M_value)) __throw_length_error("invalid value for socket option resize"); } protected: _Tp _M_value { }; }; // Base class for types meeting BooleanSocketOption requirements. template<> struct __sockopt_base<bool> : __sockopt_base<int, false> { __sockopt_base() = default; explicit __sockopt_base(bool __val) noexcept : __sockopt_base<int, false>(__val) { } bool value() const noexcept { return this->_M_value; } explicit operator bool() const noexcept { return value(); } bool operator!() const noexcept { return !value(); } }; // Base class for types meeting IntegerSocketOption requirements. template<> struct __sockopt_base<int> : __sockopt_base<int, false> { using __sockopt_base<int, false>::__sockopt_base; int value() const noexcept { return this->_M_value; } }; template<typename _Derived, typename _Tp = int> struct __sockopt_crtp : __sockopt_base<_Tp> { using __sockopt_base<_Tp>::__sockopt_base; _Derived& operator=(_Tp __value) noexcept(noexcept(__value = __value)) { __sockopt_base<_Tp>::_M_value = __value; return static_cast<_Derived&>(*this); } template<typename _Protocol> int level(const _Protocol&) const noexcept { return _Derived::_S_level; } template<typename _Protocol> int name(const _Protocol&) const noexcept { return _Derived::_S_name; } }; namespace __detail { #if __cpp_lib_concepts template<typename _Tp> concept __protocol_like = copyable<_Tp> && requires { typename _Tp::endpoint; }; // Endpoint requirements for non-extensible implementations. template<typename _Tp> concept __endpoint_base = semiregular<_Tp> && requires { typename _Tp::protocol_type; } && __protocol_like<typename _Tp::protocol_type> && requires(const _Tp __a) { { __a.protocol() } -> same_as<typename _Tp::protocol_type>; }; // Endpoint requirements for extensible implementations. template<typename _Tp> concept __endpoint = __endpoint_base<_Tp> && requires (const _Tp& __a, _Tp& __b, size_t __s) { { __a.data() } -> same_as<const void*>; { __b.data() } -> same_as<void*>; { __b.size() } -> same_as<size_t>; __b.resize(__s); { __a.capacity() } -> same_as<size_t>; }; // Protocol requirements for non-extensible implementations. template<typename _Tp> concept __protocol_base = __protocol_like<_Tp> && __endpoint_base<typename _Tp::endpoint> && same_as<typename _Tp::endpoint::protocol_type, _Tp>; // Protocol requirements for extensible implementations. template<typename _Tp> concept __protocol = __protocol_base<_Tp> && __endpoint<typename _Tp::endpoint> && requires (const _Tp __a) { { __a.family() } -> same_as<int>; { __a.type() } -> same_as<int>; { __a.protocol() } -> same_as<int>; }; template<typename _Tp> concept __acceptable_protocol = __protocol<_Tp> && requires { typename _Tp::socket; } && move_constructible<typename _Tp::socket> && derived_from<typename _Tp::socket, basic_socket<_Tp>>; template<typename _Tp> concept __inet_protocol = __acceptable_protocol<_Tp> && equality_comparable<_Tp> && requires { { _Tp::v4() } -> same_as<_Tp>; { _Tp::v6() } -> same_as<_Tp>; typename _Tp::resolver; } && same_as<typename _Tp::resolver, ip::basic_resolver<_Tp>>; #else // Check Endpoint requirements for extensible implementations template<typename _Tp, typename = void> struct __is_endpoint : false_type { }; template<typename _Tp> auto __endpoint_reqs(const _Tp* __a = nullptr, _Tp* __b = nullptr) -> enable_if_t<__and_< is_default_constructible<_Tp>, __is_value_constructible<_Tp>, is_same<decltype(__a->protocol()), typename _Tp::protocol_type>, is_same<decltype(__a->data()), const void*>, is_same<decltype(__b->data()), void*>, is_same<decltype(__a->size()), size_t>, is_same<decltype(__a->capacity()), size_t> >::value, __void_t< typename _Tp::protocol_type::endpoint, decltype(__b->resize(std::declval<size_t>())) >>; template<typename _Tp> struct __is_endpoint<_Tp, decltype(__detail::__endpoint_reqs<_Tp>())> : true_type { }; // Check Protocol requirements for extensible implementations. template<typename _Tp, typename = void> struct __is_protocol : false_type { }; template<typename _Tp> auto __protocol_reqs(const _Tp* __a = nullptr) -> enable_if_t<__and_< is_copy_constructible<_Tp>, is_copy_assignable<_Tp>, __is_endpoint<typename _Tp::endpoint>, is_same<decltype(__a->family()), int>, is_same<decltype(__a->type()), int>, is_same<decltype(__a->protocol()), int> >::value>; template<typename _Tp> struct __is_protocol<_Tp, decltype(__detail::__protocol_reqs<_Tp>())> : true_type { }; // Check AcceptableProtocol requirements template<typename _Tp, typename = void> struct __is_acceptable_protocol : false_type { }; template<typename _Tp> struct __is_acceptable_protocol<_Tp, __void_t<typename _Tp::socket>> : __and_<__is_protocol<_Tp>, is_move_constructible<typename _Tp::socket>, is_convertible<typename _Tp::socket*, basic_socket<_Tp>*>>::type { }; // Check InternetProtocol requirements template<typename _Tp, typename = void> struct __is_inet_protocol : false_type { }; template<typename _Tp> auto __inet_proto_reqs(const _Tp* __a = nullptr) -> enable_if_t<__and_< __is_acceptable_protocol<_Tp>, is_same<typename _Tp::resolver, ip::basic_resolver<_Tp>>, is_same<decltype(_Tp::v4()), _Tp>, is_same<decltype(_Tp::v6()), _Tp>, is_convertible<decltype(*__a == *__a), bool>, is_convertible<decltype(*__a != *__a), bool> >::value>; template<typename _Tp> struct __is_inet_protocol<_Tp, decltype(__inet_proto_reqs<_Tp>())> : true_type { }; // Variable templates for requirements (with same names as concepts above). template<typename _Tp> constexpr bool __endpoint = __is_endpoint<_Tp>::value; template<typename _Tp> constexpr bool __protocol = __is_protocol<_Tp>::value; template<typename _Tp> constexpr bool __acceptable_protocol = __is_acceptable_protocol<_Tp>::value; #endif } // namespace __detail /// @} } // namespace v1 } // namespace net } // namespace experimental _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++14 #endif // _GLIBCXX_EXPERIMENTAL_NET_H