1 // Exception Handling support header for -*- C++ -*-
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32 * This header defines several types and functions relating to the
33 * handling of exceptions in a C++ program.
43 /** This is the base class for all exceptions thrown by the standard
44 * library, and by certain language expressions. You are free to derive
45 * your own %exception classes, or use a different hierarchy, or to
46 * throw non-class data (e.g., fundamental types).
47 * @brief Base class for all library exceptions.
52 exception() throw() { }
53 virtual ~exception() throw();
54 /** Returns a C-style character string describing the general cause
55 * of the current error. */
56 virtual const char* what() const throw();
59 /** If an %exception is thrown which is not listed in a function's
60 * %exception specification, one of these may be thrown. */
61 class bad_exception : public exception
64 bad_exception() throw() { }
67 /// If you write a replacement %terminate handler, it must be of this type.
68 typedef void (*terminate_handler) ();
69 /// If you write a replacement %unexpected handler, it must be of this type.
70 typedef void (*unexpected_handler) ();
72 /// Takes a new handler function as an argument, returns the old function.
73 terminate_handler set_terminate(terminate_handler) throw();
74 /** The runtime will call this function if %exception handling must be
75 * abandoned for any reason. */
76 void terminate() __attribute__ ((__noreturn__));
78 /// Takes a new handler function as an argument, returns the old function.
79 unexpected_handler set_unexpected(unexpected_handler) throw();
80 /** The runtime will call this function if an %exception is thrown which
81 * violates the function's %exception specification. */
82 void unexpected() __attribute__ ((__noreturn__));
84 /** [18.6.4]/1: "Returns true after completing evaluation of a
85 * throw-expression until either completing initialization of the
86 * exception-declaration in the matching handler or entering @c unexpected()
87 * due to the throw; or after entering @c terminate() for any reason
88 * other than an explicit call to @c terminate(). [Note: This includes
89 * stack unwinding [15.2]. end note]"
91 * 2: "When @c uncaught_exception() is true, throwing an %exception can
92 * result in a call of @c terminate() (15.5.1)."
94 bool uncaught_exception() throw();
99 /** A replacement for the standard terminate_handler which prints more
100 information about the terminating exception (if any) on stderr.
102 std::set_terminate (__gnu_cxx::__verbose_terminate_handler)
105 void __verbose_terminate_handler ();
106 } // namespace __gnu_cxx