libstdc++
exception
Go to the documentation of this file.
1 // Exception Handling support header for -*- C++ -*-
2 
3 // Copyright (C) 1995-2019 Free Software Foundation, Inc.
4 //
5 // This file is part of GCC.
6 //
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 3, or (at your option)
10 // any later version.
11 //
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.
16 //
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
20 
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
25 
26 /** @file exception
27  * This is a Standard C++ Library header.
28  */
29 
30 #ifndef __EXCEPTION__
31 #define __EXCEPTION__
32 
33 #pragma GCC system_header
34 
35 #pragma GCC visibility push(default)
36 
37 #include <bits/c++config.h>
38 #include <bits/exception.h>
39 
40 extern "C++" {
41 
42 namespace std
43 {
44  /** If an %exception is thrown which is not listed in a function's
45  * %exception specification, one of these may be thrown. */
46  class bad_exception : public exception
47  {
48  public:
49  bad_exception() _GLIBCXX_USE_NOEXCEPT { }
50 
51  // This declaration is not useless:
52  // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
53  virtual ~bad_exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
54 
55  // See comment in eh_exception.cc.
56  virtual const char*
57  what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
58  };
59 
60  /// If you write a replacement %terminate handler, it must be of this type.
61  typedef void (*terminate_handler) ();
62 
63  /// If you write a replacement %unexpected handler, it must be of this type.
64  typedef void (*unexpected_handler) ();
65 
66  /// Takes a new handler function as an argument, returns the old function.
67  terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT;
68 
69 #if __cplusplus >= 201103L
70  /// Return the current terminate handler.
72 #endif
73 
74  /** The runtime will call this function if %exception handling must be
75  * abandoned for any reason. It can also be called by the user. */
76  void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
77 
78  /// Takes a new handler function as an argument, returns the old function.
80 
81 #if __cplusplus >= 201103L
82  /// Return the current unexpected handler.
84 #endif
85 
86  /** The runtime will call this function if an %exception is thrown which
87  * violates the function's %exception specification. */
88  void unexpected() __attribute__ ((__noreturn__));
89 
90  /** [18.6.4]/1: 'Returns true after completing evaluation of a
91  * throw-expression until either completing initialization of the
92  * exception-declaration in the matching handler or entering @c unexpected()
93  * due to the throw; or after entering @c terminate() for any reason
94  * other than an explicit call to @c terminate(). [Note: This includes
95  * stack unwinding [15.2]. end note]'
96  *
97  * 2: 'When @c uncaught_exception() is true, throwing an
98  * %exception can result in a call of @c terminate()
99  * (15.5.1).'
100  */
101  _GLIBCXX17_DEPRECATED
102  bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
103 
104 #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++98
105 #define __cpp_lib_uncaught_exceptions 201411L
106  /// The number of uncaught exceptions.
107  int uncaught_exceptions() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
108 #endif
109 
110  // @} group exceptions
111 } // namespace std
112 
113 namespace __gnu_cxx
114 {
115 _GLIBCXX_BEGIN_NAMESPACE_VERSION
116 
117  /**
118  * @brief A replacement for the standard terminate_handler which
119  * prints more information about the terminating exception (if any)
120  * on stderr.
121  *
122  * @ingroup exceptions
123  *
124  * Call
125  * @code
126  * std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
127  * @endcode
128  * to use. For more info, see
129  * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
130  *
131  * In 3.4 and later, this is on by default.
132  */
134 
135 _GLIBCXX_END_NAMESPACE_VERSION
136 } // namespace
137 
138 } // extern "C++"
139 
140 #pragma GCC visibility pop
141 
142 #if (__cplusplus >= 201103L)
143 #include <bits/exception_ptr.h>
144 #include <bits/nested_exception.h>
145 #endif
146 
147 #endif
void(* unexpected_handler)()
If you write a replacement unexpected handler, it must be of this type.
Definition: exception:64
virtual const char * what() const _GLIBCXX_TXN_SAFE_DYN noexcept
ISO C++ entities toplevel namespace is std.
terminate_handler get_terminate() noexcept
Return the current terminate handler.
_GLIBCXX17_DEPRECATED bool uncaught_exception() noexcept __attribute__((__pure__))
terminate_handler set_terminate(terminate_handler) noexcept
Takes a new handler function as an argument, returns the old function.
int uncaught_exceptions() noexcept __attribute__((__pure__))
The number of uncaught exceptions.
unexpected_handler get_unexpected() noexcept
Return the current unexpected handler.
void unexpected() __attribute__((__noreturn__))
Base class for all library exceptions.
Definition: exception.h:60
unexpected_handler set_unexpected(unexpected_handler) noexcept
Takes a new handler function as an argument, returns the old function.
void(* terminate_handler)()
If you write a replacement terminate handler, it must be of this type.
Definition: exception:61
void terminate() noexcept __attribute__((__noreturn__))
GNU extensions for public use.
void __verbose_terminate_handler()
A replacement for the standard terminate_handler which prints more information about the terminating ...