libstdc++-v3/libsupc++/cxxabi-forced.h

   1 // cxxabi.h subset for inclusion by other library headers -*- C++ -*-
   2
   3 // Copyright (C) 2007, 2009 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 cxxabi-forced.h
  27  *  The header provides an interface to the C++ ABI.
  28  */
  29
  30 #ifndef _CXXABI_FORCED_H
  31 #define _CXXABI_FORCED_H 1
  32
  33 #pragma GCC visibility push(default)
  34
  35 #ifdef __cplusplus
  36 namespace __cxxabiv1
  37 {
  38   /**
  39    *  @brief Thrown as part of forced unwinding.
  40    *  @ingroup exceptions
  41    *
  42    *  A magic placeholder class that can be caught by reference to
  43    *  recognize forced unwinding.
  44    */
  45   class __forced_unwind
  46   {
  47     virtual ~__forced_unwind() throw();
  48
  49     // Prevent catch by value.
  50     virtual void __pure_dummy() = 0;
  51   };
  52 }
  53 #endif // __cplusplus
  54
  55 #pragma GCC visibility pop
  56
  57 #endif // __CXXABI_FORCED_H