1 // Networking implementation details -*- C++ -*- 2 3 // Copyright (C) 2015-2019 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/networking} 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 /** 52 * @ingroup networking 53 * @{ 54 */ 55 56 template<typename _CompletionToken, typename _Signature, typename> 57 class async_result; 58 59 // A type denoted by DEDUCED in the TS. 60 template<typename _CompletionToken, typename _Signature> 61 using __deduced_t = typename 62 async_result<decay_t<_CompletionToken>, _Signature, void>::return_type; 63 64 // Trait to check for construction from const/non-const lvalue/rvalue. 65 template<typename _Tp> 66 using __is_value_constructible = typename __and_< 67 is_copy_constructible<_Tp>, is_move_constructible<_Tp>, 68 is_constructible<_Tp, _Tp&>, is_constructible<_Tp, const _Tp&&> 69 >::type; 70 71 struct __throw_on_error 72 { 73 explicit 74 __throw_on_error(const char* __msg) : _M_msg(__msg) { } 75 76 ~__throw_on_error() noexcept(false) 77 { 78 if (_M_ec) 79 _GLIBCXX_THROW_OR_ABORT(system_error(_M_ec, _M_msg)); 80 } 81 82 __throw_on_error(const __throw_on_error&) = delete; 83 __throw_on_error& operator=(const __throw_on_error&) = delete; 84 85 operator error_code&() noexcept { return _M_ec; } 86 87 const char* _M_msg; 88 error_code _M_ec; 89 }; 90 91 // Base class for types meeting IntegerSocketOption requirements. 92 template<typename _Tp> 93 struct __sockopt_base 94 { 95 __sockopt_base() = default; 96 97 explicit __sockopt_base(int __val) : _M_value(__val) { } 98 99 int value() const noexcept { return _M_value; } 100 101 template<typename _Protocol> 102 void* 103 data(const _Protocol&) noexcept 104 { return std::addressof(_M_value); } 105 106 template<typename _Protocol> 107 const void* 108 data(const _Protocol&) const noexcept 109 { return std::addressof(_M_value); } 110 111 template<typename _Protocol> 112 size_t 113 size(const _Protocol&) const noexcept 114 { return sizeof(_M_value); } 115 116 template<typename _Protocol> 117 void 118 resize(const _Protocol&, size_t __s) 119 { 120 if (__s != sizeof(_M_value)) 121 __throw_length_error("invalid value for socket option resize"); 122 } 123 124 protected: 125 _Tp _M_value { }; 126 }; 127 128 // Base class for types meeting BooleanSocketOption requirements. 129 template<> 130 struct __sockopt_base<bool> : __sockopt_base<int> 131 { 132 __sockopt_base() = default; 133 134 explicit __sockopt_base(bool __val) : __sockopt_base<int>(__val) { } 135 136 bool value() const noexcept { return __sockopt_base<int>::_M_value; } 137 explicit operator bool() const noexcept { return value(); } 138 bool operator!() const noexcept { return !value(); } 139 }; 140 141 template<typename _Derived, typename _Tp = int> 142 struct __sockopt_crtp : __sockopt_base<_Tp> 143 { 144 using __sockopt_base<_Tp>::__sockopt_base; 145 146 _Derived& 147 operator=(_Tp __value) 148 { 149 __sockopt_base<_Tp>::_M_value = __value; 150 return static_cast<_Derived&>(*this); 151 } 152 153 template<typename _Protocol> 154 int 155 level(const _Protocol&) const noexcept 156 { return _Derived::_S_level; } 157 158 template<typename _Protocol> 159 int 160 name(const _Protocol&) const noexcept 161 { return _Derived::_S_name; } 162 }; 163 164 /// @} 165 166 } // namespace v1 167 } // namespace net 168 } // namespace experimental 169 _GLIBCXX_END_NAMESPACE_VERSION 170 } // namespace std 171 172 #endif // C++14 173 174 #endif // _GLIBCXX_EXPERIMENTAL_NET_H 175