117 lines
4.4 KiB
C++
117 lines
4.4 KiB
C++
// Exception Handling support header for -*- C++ -*-
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// Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002
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// Free Software Foundation
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//
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// This file is part of GNU CC.
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//
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// GNU CC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2, or (at your option)
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// any later version.
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//
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// GNU CC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GNU CC; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file exception
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* This header defines several types and functions relating to the
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* handling of exceptions in a C++ program.
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*/
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#ifndef __EXCEPTION__
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#define __EXCEPTION__
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extern "C++" {
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namespace std
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{
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/** This is the base class for all exceptions thrown by the standard
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* library, and by certain language expressions. You are free to derive
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* your own %exception classes, or use a different hierarchy, or to
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* throw non-class data (e.g., fundamental types).
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* @brief Base class for all library exceptions.
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*/
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class exception
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{
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public:
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exception() throw() { }
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virtual ~exception() throw();
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/** Returns a C-style character string describing the general cause
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* of the current error. */
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virtual const char* what() const throw();
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};
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/** If an %exception is thrown which is not listed in a function's
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* %exception specification, one of these may be thrown. */
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class bad_exception : public exception
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{
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public:
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bad_exception() throw() { }
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// This declaration is not useless:
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// http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
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virtual ~bad_exception() throw();
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};
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/// If you write a replacement %terminate handler, it must be of this type.
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typedef void (*terminate_handler) ();
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/// If you write a replacement %unexpected handler, it must be of this type.
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typedef void (*unexpected_handler) ();
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/// Takes a new handler function as an argument, returns the old function.
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terminate_handler set_terminate(terminate_handler) throw();
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/** The runtime will call this function if %exception handling must be
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* abandoned for any reason. */
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void terminate() __attribute__ ((__noreturn__));
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/// Takes a new handler function as an argument, returns the old function.
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unexpected_handler set_unexpected(unexpected_handler) throw();
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/** The runtime will call this function if an %exception is thrown which
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* violates the function's %exception specification. */
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void unexpected() __attribute__ ((__noreturn__));
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/** [18.6.4]/1: "Returns true after completing evaluation of a
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* throw-expression until either completing initialization of the
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* exception-declaration in the matching handler or entering @c unexpected()
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* due to the throw; or after entering @c terminate() for any reason
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* other than an explicit call to @c terminate(). [Note: This includes
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* stack unwinding [15.2]. end note]"
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*
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* 2: "When @c uncaught_exception() is true, throwing an %exception can
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* result in a call of @c terminate() (15.5.1)."
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*/
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bool uncaught_exception() throw();
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} // namespace std
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namespace __gnu_cxx
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{
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/** A replacement for the standard terminate_handler which prints more
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information about the terminating exception (if any) on stderr. Call
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@code
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std::set_terminate (__gnu_cxx::__verbose_terminate_handler)
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@endcode
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to use. For more info, see
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http://gcc.gnu.org/onlinedocs/libstdc++/19_diagnostics/howto.html#4
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*/
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void __verbose_terminate_handler ();
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} // namespace __gnu_cxx
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} // extern "C++"
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#endif
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