exception_ptr.h

Go to the documentation of this file.
00001 // Exception Handling support header (exception_ptr class) for -*- C++ -*-
00002 
00003 // Copyright (C) 2008, 2009 Free Software Foundation
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 exception_ptr.h
00027  *  This is an internal header file, included by other headers and the
00028  *  implementation. You should not attempt to use it directly.
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 <exception_defines.h>
00038 
00039 #if !defined(_GLIBCXX_ATOMIC_BUILTINS_4)
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 
00054   // Hide the free operators from other types
00055   namespace __exception_ptr
00056   {
00057     /**
00058      * @brief An opaque pointer to an arbitrary exception.
00059      */
00060     class exception_ptr;
00061   }
00062 
00063   using __exception_ptr::exception_ptr;
00064 
00065   /** Obtain an %exception_ptr to the currently handled exception. If there
00066    *  is none, or the currently handled exception is foreign, return the null
00067    *  value.
00068    */
00069   exception_ptr current_exception() throw();
00070 
00071   /// Throw the object pointed to by the %exception_ptr.
00072   void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
00073 
00074   /// Obtain an %exception_ptr pointing to a copy of the supplied object.
00075   template<typename _Ex>
00076     exception_ptr 
00077     copy_exception(_Ex __ex) throw();
00078 
00079   namespace __exception_ptr
00080   {
00081     bool 
00082     operator==(const exception_ptr&, const exception_ptr&) throw();
00083 
00084     bool 
00085     operator!=(const exception_ptr&, const exception_ptr&) throw();
00086 
00087     class exception_ptr
00088     {
00089       void* _M_exception_object;
00090 
00091       explicit exception_ptr(void* __e) throw();
00092 
00093       void _M_addref() throw();
00094       void _M_release() throw();
00095 
00096       void *_M_get() const throw();
00097 
00098       void _M_safe_bool_dummy();
00099 
00100       friend exception_ptr std::current_exception() throw();
00101       friend void std::rethrow_exception(exception_ptr);
00102 
00103     public:
00104       exception_ptr() throw();
00105 
00106       typedef void (exception_ptr::*__safe_bool)();
00107 
00108       // For construction from nullptr or 0.
00109       exception_ptr(__safe_bool) throw();
00110 
00111       exception_ptr(const exception_ptr&) throw();
00112 
00113 #ifdef __GXX_EXPERIMENTAL_CXX0X__
00114       exception_ptr(exception_ptr&& __o) throw()
00115       : _M_exception_object(__o._M_exception_object)
00116       { __o._M_exception_object = 0; }
00117 #endif
00118 
00119       exception_ptr& 
00120       operator=(const exception_ptr&) throw();
00121 
00122 #ifdef __GXX_EXPERIMENTAL_CXX0X__
00123       exception_ptr& 
00124       operator=(exception_ptr&& __o) throw()
00125       {
00126         exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
00127         return *this;
00128       }
00129 #endif
00130 
00131       ~exception_ptr() throw();
00132 
00133       void 
00134       swap(exception_ptr&) throw();
00135 
00136 #ifdef _GLIBCXX_EH_PTR_COMPAT
00137       // Retained for compatibility with CXXABI_1.3.
00138       bool operator!() const throw();
00139       operator __safe_bool() const throw();
00140 #endif
00141 
00142       friend bool 
00143       operator==(const exception_ptr&, const exception_ptr&) throw();
00144 
00145       const class std::type_info*
00146       __cxa_exception_type() const throw();
00147     };
00148 
00149   } // namespace __exception_ptr
00150 
00151 
00152   template<typename _Ex>
00153     exception_ptr 
00154     copy_exception(_Ex __ex) throw()
00155     {
00156       __try
00157     {
00158       throw __ex;
00159     }
00160       __catch(...)
00161     {
00162       return current_exception ();
00163     }
00164     }
00165 
00166   // @} group exceptions
00167 } // namespace std
00168 
00169 } // extern "C++"
00170 
00171 #pragma GCC visibility pop
00172 
00173 #endif

Generated on 19 Jun 2018 for libstdc++ by  doxygen 1.6.1