libstdc++
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00001 // Exception Handling support header (exception_ptr class) for -*- C++ -*- 00002 00003 // Copyright (C) 2008-2013 Free Software Foundation, Inc. 00004 // 00005 // This file is part of GCC. 00006 // 00007 // GCC is free software; you can redistribute it and/or modify 00008 // it under the terms of the GNU General Public License as published by 00009 // the Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 // 00012 // GCC is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 // 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file bits/exception_ptr.h 00027 * This is an internal header file, included by other library headers. 00028 * Do not attempt to use it directly. @headername{exception} 00029 */ 00030 00031 #ifndef _EXCEPTION_PTR_H 00032 #define _EXCEPTION_PTR_H 00033 00034 #pragma GCC visibility push(default) 00035 00036 #include <bits/c++config.h> 00037 #include <bits/exception_defines.h> 00038 00039 #if ATOMIC_INT_LOCK_FREE < 2 00040 # error This platform does not support exception propagation. 00041 #endif 00042 00043 extern "C++" { 00044 00045 namespace std 00046 { 00047 class type_info; 00048 00049 /** 00050 * @addtogroup exceptions 00051 * @{ 00052 */ 00053 namespace __exception_ptr 00054 { 00055 class exception_ptr; 00056 } 00057 00058 using __exception_ptr::exception_ptr; 00059 00060 /** Obtain an exception_ptr to the currently handled exception. If there 00061 * is none, or the currently handled exception is foreign, return the null 00062 * value. 00063 */ 00064 exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT; 00065 00066 /// Throw the object pointed to by the exception_ptr. 00067 void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__)); 00068 00069 namespace __exception_ptr 00070 { 00071 /** 00072 * @brief An opaque pointer to an arbitrary exception. 00073 * @ingroup exceptions 00074 */ 00075 class exception_ptr 00076 { 00077 void* _M_exception_object; 00078 00079 explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT; 00080 00081 void _M_addref() _GLIBCXX_USE_NOEXCEPT; 00082 void _M_release() _GLIBCXX_USE_NOEXCEPT; 00083 00084 void *_M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__)); 00085 00086 friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT; 00087 friend void std::rethrow_exception(exception_ptr); 00088 00089 public: 00090 exception_ptr() _GLIBCXX_USE_NOEXCEPT; 00091 00092 exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT; 00093 00094 #if __cplusplus >= 201103L 00095 exception_ptr(nullptr_t) noexcept 00096 : _M_exception_object(0) 00097 { } 00098 00099 exception_ptr(exception_ptr&& __o) noexcept 00100 : _M_exception_object(__o._M_exception_object) 00101 { __o._M_exception_object = 0; } 00102 #endif 00103 00104 #if (__cplusplus < 201103L) || defined (_GLIBCXX_EH_PTR_COMPAT) 00105 typedef void (exception_ptr::*__safe_bool)(); 00106 00107 // For construction from nullptr or 0. 00108 exception_ptr(__safe_bool) _GLIBCXX_USE_NOEXCEPT; 00109 #endif 00110 00111 exception_ptr& 00112 operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT; 00113 00114 #if __cplusplus >= 201103L 00115 exception_ptr& 00116 operator=(exception_ptr&& __o) noexcept 00117 { 00118 exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this); 00119 return *this; 00120 } 00121 #endif 00122 00123 ~exception_ptr() _GLIBCXX_USE_NOEXCEPT; 00124 00125 void 00126 swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT; 00127 00128 #ifdef _GLIBCXX_EH_PTR_COMPAT 00129 // Retained for compatibility with CXXABI_1.3. 00130 void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT 00131 __attribute__ ((__const__)); 00132 bool operator!() const _GLIBCXX_USE_NOEXCEPT 00133 __attribute__ ((__pure__)); 00134 operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT; 00135 #endif 00136 00137 #if __cplusplus >= 201103L 00138 explicit operator bool() const 00139 { return _M_exception_object; } 00140 #endif 00141 00142 friend bool 00143 operator==(const exception_ptr&, const exception_ptr&) 00144 _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00145 00146 const class std::type_info* 00147 __cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT 00148 __attribute__ ((__pure__)); 00149 }; 00150 00151 bool 00152 operator==(const exception_ptr&, const exception_ptr&) 00153 _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00154 00155 bool 00156 operator!=(const exception_ptr&, const exception_ptr&) 00157 _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00158 00159 inline void 00160 swap(exception_ptr& __lhs, exception_ptr& __rhs) 00161 { __lhs.swap(__rhs); } 00162 00163 } // namespace __exception_ptr 00164 00165 00166 /// Obtain an exception_ptr pointing to a copy of the supplied object. 00167 template<typename _Ex> 00168 exception_ptr 00169 copy_exception(_Ex __ex) _GLIBCXX_USE_NOEXCEPT 00170 { 00171 __try 00172 { 00173 #ifdef __EXCEPTIONS 00174 throw __ex; 00175 #endif 00176 } 00177 __catch(...) 00178 { 00179 return current_exception(); 00180 } 00181 } 00182 00183 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00184 // 1130. copy_exception name misleading 00185 /// Obtain an exception_ptr pointing to a copy of the supplied object. 00186 template<typename _Ex> 00187 exception_ptr 00188 make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT 00189 { return std::copy_exception<_Ex>(__ex); } 00190 00191 // @} group exceptions 00192 } // namespace std 00193 00194 } // extern "C++" 00195 00196 #pragma GCC visibility pop 00197 00198 #endif