1 // Networking implementation details -*- C++ -*- 2 3 // Copyright (C) 2015-2020 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file experimental/bits/net.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{experimental/net} 28 */ 29 30 #ifndef _GLIBCXX_EXPERIMENTAL_NET_H 31 #define _GLIBCXX_EXPERIMENTAL_NET_H 1 32 33 #pragma GCC system_header 34 35 #if __cplusplus >= 201402L 36 37 #include <type_traits> 38 #include <system_error> 39 #include <experimental/netfwd> 40 41 namespace std _GLIBCXX_VISIBILITY(default) 42 { 43 _GLIBCXX_BEGIN_NAMESPACE_VERSION 44 namespace experimental 45 { 46 namespace net 47 { 48 inline namespace v1 49 { 50 51 /** @addtogroup networking-ts 52 * @{ 53 */ 54 55 template<typename _CompletionToken, typename _Signature, typename> 56 class async_result; 57 58 /// @cond undocumented 59 60 // A type denoted by DEDUCED in the TS. 61 template<typename _CompletionToken, typename _Signature> 62 using __deduced_t = typename 63 async_result<decay_t<_CompletionToken>, _Signature, void>::return_type; 64 65 // Trait to check for construction from const/non-const lvalue/rvalue. 66 template<typename _Tp> 67 using __is_value_constructible = typename __and_< 68 is_copy_constructible<_Tp>, is_move_constructible<_Tp>, 69 is_constructible<_Tp, _Tp&>, is_constructible<_Tp, const _Tp&&> 70 >::type; 71 72 struct __throw_on_error 73 { 74 explicit 75 __throw_on_error(const char* __msg) : _M_msg(__msg) { } 76 77 ~__throw_on_error() noexcept(false) 78 { 79 if (_M_ec) 80 _GLIBCXX_THROW_OR_ABORT(system_error(_M_ec, _M_msg)); 81 } 82 83 __throw_on_error(const __throw_on_error&) = delete; 84 __throw_on_error& operator=(const __throw_on_error&) = delete; 85 86 operator error_code&() noexcept { return _M_ec; } 87 88 const char* _M_msg; 89 error_code _M_ec; 90 }; 91 92 /// @endcond 93 94 // Base class for types meeting IntegerSocketOption requirements. 95 template<typename _Tp> 96 struct __sockopt_base 97 { 98 __sockopt_base() = default; 99 100 explicit __sockopt_base(int __val) : _M_value(__val) { } 101 102 int value() const noexcept { return _M_value; } 103 104 template<typename _Protocol> 105 void* 106 data(const _Protocol&) noexcept 107 { return std::addressof(_M_value); } 108 109 template<typename _Protocol> 110 const void* 111 data(const _Protocol&) const noexcept 112 { return std::addressof(_M_value); } 113 114 template<typename _Protocol> 115 size_t 116 size(const _Protocol&) const noexcept 117 { return sizeof(_M_value); } 118 119 template<typename _Protocol> 120 void 121 resize(const _Protocol&, size_t __s) 122 { 123 if (__s != sizeof(_M_value)) 124 __throw_length_error("invalid value for socket option resize"); 125 } 126 127 protected: 128 _Tp _M_value { }; 129 }; 130 131 // Base class for types meeting BooleanSocketOption requirements. 132 template<> 133 struct __sockopt_base<bool> : __sockopt_base<int> 134 { 135 __sockopt_base() = default; 136 137 explicit __sockopt_base(bool __val) : __sockopt_base<int>(__val) { } 138 139 bool value() const noexcept { return __sockopt_base<int>::_M_value; } 140 explicit operator bool() const noexcept { return value(); } 141 bool operator!() const noexcept { return !value(); } 142 }; 143 144 template<typename _Derived, typename _Tp = int> 145 struct __sockopt_crtp : __sockopt_base<_Tp> 146 { 147 using __sockopt_base<_Tp>::__sockopt_base; 148 149 _Derived& 150 operator=(_Tp __value) 151 { 152 __sockopt_base<_Tp>::_M_value = __value; 153 return static_cast<_Derived&>(*this); 154 } 155 156 template<typename _Protocol> 157 int 158 level(const _Protocol&) const noexcept 159 { return _Derived::_S_level; } 160 161 template<typename _Protocol> 162 int 163 name(const _Protocol&) const noexcept 164 { return _Derived::_S_name; } 165 }; 166 167 /// @} 168 169 } // namespace v1 170 } // namespace net 171 } // namespace experimental 172 _GLIBCXX_END_NAMESPACE_VERSION 173 } // namespace std 174 175 #endif // C++14 176 177 #endif // _GLIBCXX_EXPERIMENTAL_NET_H 178