1 // Exception Handling support header for -*- C++ -*-
3 // Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
4 // 2004, 2005, 2006, 2007, 2008, 2009
5 // Free Software Foundation
7 // This file is part of GCC.
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14 // GCC is distributed in the hope that it will be useful,
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
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22 // Boston, MA 02110-1301, USA.
24 // As a special exception, you may use this file as part of a free software
25 // library without restriction. Specifically, if other files instantiate
26 // templates or use macros or inline functions from this file, or you compile
27 // this file and link it with other files to produce an executable, this
28 // file does not by itself cause the resulting executable to be covered by
29 // the GNU General Public License. This exception does not however
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31 // the GNU General Public License.
34 * This is a Standard C++ Library header.
40 #pragma GCC visibility push(default)
42 #include <bits/c++config.h>
49 * @defgroup exceptions Exceptions
50 * @ingroup diagnostics
52 * Classes and functions for reporting errors via exception classes.
57 * @brief Base class for all library exceptions.
59 * This is the base class for all exceptions thrown by the standard
60 * library, and by certain language expressions. You are free to derive
61 * your own %exception classes, or use a different hierarchy, or to
62 * throw non-class data (e.g., fundamental types).
67 exception() throw() { }
68 virtual ~exception() throw();
70 /** Returns a C-style character string describing the general cause
71 * of the current error. */
72 virtual const char* what() const throw();
75 /** If an %exception is thrown which is not listed in a function's
76 * %exception specification, one of these may be thrown. */
77 class bad_exception : public exception
80 bad_exception() throw() { }
82 // This declaration is not useless:
83 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
84 virtual ~bad_exception() throw();
86 // See comment in eh_exception.cc.
87 virtual const char* what() const throw();
90 /// If you write a replacement %terminate handler, it must be of this type.
91 typedef void (*terminate_handler) ();
93 /// If you write a replacement %unexpected handler, it must be of this type.
94 typedef void (*unexpected_handler) ();
96 /// Takes a new handler function as an argument, returns the old function.
97 terminate_handler set_terminate(terminate_handler) throw();
99 /** The runtime will call this function if %exception handling must be
100 * abandoned for any reason. It can also be called by the user. */
101 void terminate() __attribute__ ((__noreturn__));
103 /// Takes a new handler function as an argument, returns the old function.
104 unexpected_handler set_unexpected(unexpected_handler) throw();
106 /** The runtime will call this function if an %exception is thrown which
107 * violates the function's %exception specification. */
108 void unexpected() __attribute__ ((__noreturn__));
110 /** [18.6.4]/1: "Returns true after completing evaluation of a
111 * throw-expression until either completing initialization of the
112 * exception-declaration in the matching handler or entering @c unexpected()
113 * due to the throw; or after entering @c terminate() for any reason
114 * other than an explicit call to @c terminate(). [Note: This includes
115 * stack unwinding [15.2]. end note]"
117 * 2: "When @c uncaught_exception() is true, throwing an %exception can
118 * result in a call of @c terminate() (15.5.1)."
120 bool uncaught_exception() throw();
122 // @} group exceptions
125 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
128 * @brief A replacement for the standard terminate_handler which
129 * prints more information about the terminating exception (if any)
132 * @ingroup exceptions
136 * std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
138 * to use. For more info, see
139 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
141 * In 3.4 and later, this is on by default.
143 void __verbose_terminate_handler();
145 _GLIBCXX_END_NAMESPACE
149 #pragma GCC visibility pop
151 #if (defined(__GXX_EXPERIMENTAL_CXX0X__) \
152 && defined(_GLIBCXX_ATOMIC_BUILTINS_4))
153 #include <exception_ptr.h>