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  1. // cxxabi.h subset for cancellation -*- C++ -*-
  2.  
  3. // Copyright (C) 2007-2015 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 bits/cxxabi_forced.h
  27.  *  This is an internal header file, included by other library headers.
  28.  *  Do not attempt to use it directly. @headername{cxxabi.h}
  29.  */
  30.  
  31. #ifndef _CXXABI_FORCED_H
  32. #define _CXXABI_FORCED_H 1
  33.  
  34. #pragma GCC system_header
  35.  
  36. #pragma GCC visibility push(default)
  37.  
  38. #ifdef __cplusplus
  39. namespace __cxxabiv1
  40. {  
  41.   /**
  42.    *  @brief Thrown as part of forced unwinding.
  43.    *  @ingroup exceptions
  44.    *
  45.    *  A magic placeholder class that can be caught by reference to
  46.    *  recognize forced unwinding.
  47.    */
  48.   class __forced_unwind
  49.   {
  50.     virtual ~__forced_unwind() throw();
  51.  
  52.     // Prevent catch by value.
  53.     virtual void __pure_dummy() = 0;
  54.   };
  55. }
  56. #endif // __cplusplus
  57.  
  58. #pragma GCC visibility pop
  59.  
  60. #endif // __CXXABI_FORCED_H
  61.