// Networking implementation details -*- C++ -*-
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// Copyright (C) 2015-2020 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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// 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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// 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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// 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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/** @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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#ifndef _GLIBCXX_EXPERIMENTAL_NET_H
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#define _GLIBCXX_EXPERIMENTAL_NET_H 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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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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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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/** @addtogroup networking-ts
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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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/// @cond undocumented
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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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// 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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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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~__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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__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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operator error_code&() noexcept { return _M_ec; }
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const char* _M_msg;
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error_code _M_ec;
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};
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/// @endcond
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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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explicit __sockopt_base(int __val) : _M_value(__val) { }
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int value() const noexcept { return _M_value; }
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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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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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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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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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protected:
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_Tp _M_value { };
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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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explicit __sockopt_base(bool __val) : __sockopt_base<int>(__val) { }
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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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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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_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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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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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 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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#endif // C++14
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#endif // _GLIBCXX_EXPERIMENTAL_NET_H
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