exception是C++中异常类的基类，基本上所以异常都继承于它。
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// Exception Handling support header for -*- C++ -*- // Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002 // Free Software Foundation // // This file is part of GCC. // // GCC is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 2, or (at your option) // any later version. // // GCC is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with GCC; see the file COPYING. If not, write to // the Free Software Foundation, 59 Temple Place - Suite 330, // Boston, MA 02111-1307, USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. /** @file exception * This header defines several types and functions relating to the * handling of exceptions in a C++ program. */ #ifndef __EXCEPTION__ #define __EXCEPTION__ extern "C++" { namespace std { /** * @brief Base class for all library exceptions. * * This is the base class for all exceptions thrown by the standard * library, and by certain language expressions. You are free to derive * your own %exception classes, or use a different hierarchy, or to * throw non-class data (e.g., fundamental types). */ class exception { public: exception() throw() { } virtual ~exception() throw(); /** Returns a C-style character string describing the general cause * of the current error. */ virtual const char* what() const throw(); }; /** If an %exception is thrown which is not listed in a function's * %exception specification, one of these may be thrown. */ class bad_exception : public exception { public: bad_exception() throw() { } // This declaration is not useless: // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 virtual ~bad_exception() throw(); }; /// If you write a replacement %terminate handler, it must be of this type. typedef void (*terminate_handler) (); /// If you write a replacement %unexpected handler, it must be of this type. typedef void (*unexpected_handler) (); /// Takes a new handler function as an argument, returns the old function. terminate_handler set_terminate(terminate_handler) throw(); /** The runtime will call this function if %exception handling must be * abandoned for any reason. It can also be called by the user. */ void terminate() __attribute__ ((__noreturn__)); /// Takes a new handler function as an argument, returns the old function. unexpected_handler set_unexpected(unexpected_handler) throw(); /** The runtime will call this function if an %exception is thrown which * violates the function's %exception specification. */ void unexpected() __attribute__ ((__noreturn__)); /** [18.6.4]/1: "Returns true after completing evaluation of a * throw-expression until either completing initialization of the * exception-declaration in the matching handler or entering @c unexpected() * due to the throw; or after entering @c terminate() for any reason * other than an explicit call to @c terminate(). [Note: This includes * stack unwinding [15.2]. end note]" * * 2: "When @c uncaught_exception() is true, throwing an %exception can * result in a call of @c terminate() (15.5.1)." */ bool uncaught_exception() throw(); } // namespace std namespace __gnu_cxx { /** A replacement for the standard terminate_handler which prints more information about the terminating exception (if any) on stderr. Call @code std::set_terminate (__gnu_cxx::__verbose_terminate_handler) @endcode to use. For more info, see http://gcc.gnu.org/onlinedocs/libstdc++/19_diagnostics/howto.html#4 In 3.4 and later, this is on by default. */ void __verbose_terminate_handler (); } // namespace __gnu_cxx } // extern "C++" #endif |
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