# exception_ptr.h

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    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   /**
    00048    * @addtogroup exceptions
    00049    * @{
    00050    */
    00051
    00052   // Hide the free operators from other types
    00053   namespace __exception_ptr
    00054   {
    00055     /**
    00056      * @brief An opaque pointer to an arbitrary exception.
    00057      */
    00058     class exception_ptr;
    00059   }
    00060
    00061   using __exception_ptr::exception_ptr;
    00062
    00063   /** Obtain an %exception_ptr to the currently handled exception. If there
    00064    *  is none, or the currently handled exception is foreign, return the null
    00065    *  value.
    00066    */
    00067   exception_ptr current_exception() throw();
    00068
    00069   /// Throw the object pointed to by the %exception_ptr.
    00070   void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
    00071
    00072   /// Obtain an %exception_ptr pointing to a copy of the supplied object.
    00073   template<typename _Ex>
    00074     exception_ptr
    00075     copy_exception(_Ex __ex) throw();
    00076
    00077   namespace __exception_ptr
    00078   {
    00079     bool
    00080     operator==(const exception_ptr&, const exception_ptr&) throw();
    00081
    00082     bool
    00083     operator!=(const exception_ptr&, const exception_ptr&) throw();
    00084
    00085     class exception_ptr
    00086     {
    00087       void* _M_exception_object;
    00088
    00089       explicit exception_ptr(void* __e) throw();
    00090
    00091       void _M_addref() throw();
    00092       void _M_release() throw();
    00093
    00094       void *_M_get() const throw();
    00095
    00096       void _M_safe_bool_dummy();
    00097
    00098       friend exception_ptr std::current_exception() throw();
    00099       friend void std::rethrow_exception(exception_ptr);
    00100
    00101     public:
    00102       exception_ptr() throw();
    00103
    00104       typedef void (exception_ptr::*__safe_bool)();
    00105
    00106       // For construction from nullptr or 0.
    00107       exception_ptr(__safe_bool) throw();
    00108
    00109       exception_ptr(const exception_ptr&) throw();
    00110
    00111 #ifdef __GXX_EXPERIMENTAL_CXX0X__
    00112       exception_ptr(exception_ptr&& __o) throw()
    00113       : _M_exception_object(__o._M_exception_object)
    00114       { __o._M_exception_object = 0; }
    00115 #endif
    00116
    00117       exception_ptr&
    00118       operator=(const exception_ptr&) throw();
    00119
    00120 #ifdef __GXX_EXPERIMENTAL_CXX0X__
    00121       exception_ptr&
    00122       operator=(exception_ptr&& __o) throw()
    00123       {
    00124         exception_ptr(__o).swap(*this);
    00125         return *this;
    00126       }
    00127 #endif
    00128
    00129       ~exception_ptr() throw();
    00130
    00131       void
    00132       swap(exception_ptr&) throw();
    00133
    00134 #ifdef __GXX_EXPERIMENTAL_CXX0X__
    00135       void
    00136       swap(exception_ptr &&__o) throw()
    00137       {
    00138         void *__tmp = _M_exception_object;
    00139         _M_exception_object = __o._M_exception_object;
    00140         __o._M_exception_object = __tmp;
    00141       }
    00142 #endif
    00143
    00144       bool operator!() const throw();
    00145       operator __safe_bool() const throw();
    00146
    00147       friend bool
    00148       operator==(const exception_ptr&, const exception_ptr&) throw();
    00149
    00150       const type_info*
    00151       __cxa_exception_type() const throw();
    00152     };
    00153
    00154   } // namespace __exception_ptr
    00155
    00156
    00157   template<typename _Ex>
    00158     exception_ptr
    00159     copy_exception(_Ex __ex) throw()
    00160     {
    00161       __try
    00162     {
    00163       throw __ex;
    00164     }
    00165       __catch(...)
    00166     {
    00167       return current_exception ();
    00168     }
    00169     }
    00170
    00171   // @} group exceptions
    00172 } // namespace std
    00173
    00174 } // extern "C++"
    00175
    00176 #pragma GCC visibility pop
    00177
    00178 #endif