libstdc++-v3/libsupc++/cxxabi_forced.h

   1 // cxxabi.h subset for cancellation -*- C++ -*-
   2
   3 // Copyright (C) 2007-2023 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