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