1 // Exception Handling support header (exception_ptr class) for -*- C++ -*-
3 // Copyright (C) 2008, 2009 Free Software Foundation
5 // This file is part of GCC.
7 // GCC is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 2, or (at your option)
12 // GCC is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with GCC; see the file COPYING. If not, write to
19 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 // Boston, MA 02110-1301, USA.
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
31 /** @file exception_ptr.h
32 * This is an internal header file, included by other headers and the
33 * implementation. You should not attempt to use it directly.
36 #ifndef _EXCEPTION_PTR_H
37 #define _EXCEPTION_PTR_H
39 #pragma GCC visibility push(default)
41 #include <bits/c++config.h>
42 #include <exception_defines.h>
44 #if !defined(_GLIBCXX_ATOMIC_BUILTINS_4)
45 # error This platform does not support exception propagation.
52 // Hide the free operators from other types
53 namespace __exception_ptr
56 * @brief An opaque pointer to an arbitrary exception.
61 using __exception_ptr::exception_ptr;
63 /** Obtain an %exception_ptr to the currently handled exception. If there
64 * is none, or the currently handled exception is foreign, return the null
67 exception_ptr current_exception() throw();
69 /// Throw the object pointed to by the %exception_ptr.
70 void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
72 /// Obtain an %exception_ptr pointing to a copy of the supplied object.
74 exception_ptr copy_exception(_Ex __ex) throw();
77 namespace __exception_ptr
79 bool operator==(const exception_ptr&,
80 const exception_ptr&) throw();
81 bool operator!=(const exception_ptr&,
82 const exception_ptr&) throw();
86 void* _M_exception_object;
88 explicit exception_ptr(void* __e) throw();
90 void _M_addref() throw();
91 void _M_release() throw();
93 void *_M_get() const throw();
95 void _M_safe_bool_dummy();
97 friend exception_ptr std::current_exception() throw();
98 friend void std::rethrow_exception(exception_ptr);
101 exception_ptr() throw();
103 typedef void (exception_ptr::*__safe_bool)();
105 // For construction from nullptr or 0.
106 exception_ptr(__safe_bool) throw();
108 exception_ptr(const exception_ptr&) throw();
110 #ifdef __GXX_EXPERIMENTAL_CXX0X__
111 exception_ptr(exception_ptr&& __o) throw()
112 : _M_exception_object(__o._M_exception_object)
114 __o._M_exception_object = 0;
118 exception_ptr& operator=(const exception_ptr&) throw();
120 #ifdef __GXX_EXPERIMENTAL_CXX0X__
121 exception_ptr& operator=(exception_ptr&& __o) throw()
123 exception_ptr(__o).swap(*this);
128 ~exception_ptr() throw();
130 void swap(exception_ptr&) throw();
132 #ifdef __GXX_EXPERIMENTAL_CXX0X__
133 void swap(exception_ptr &&__o) throw()
135 void *__tmp = _M_exception_object;
136 _M_exception_object = __o._M_exception_object;
137 __o._M_exception_object = __tmp;
141 bool operator!() const throw();
142 operator __safe_bool() const throw();
144 friend bool operator==(const exception_ptr&,
145 const exception_ptr&) throw();
147 const type_info *__cxa_exception_type() const throw();
150 } // namespace __exception_ptr
154 exception_ptr copy_exception(_Ex __ex) throw()
162 return current_exception ();
170 #pragma GCC visibility pop