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

   1 // -fno-exceptions Support -*- C++ -*-
   2
   3 // Copyright (C) 2001-2017 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /** @file bits/exception_defines.h
  26  *  This is an internal header file, included by other library headers.
  27  *  Do not attempt to use it directly. @headername{exception}
  28  */
  29
  30 #ifndef _EXCEPTION_DEFINES_H
  31 #define _EXCEPTION_DEFINES_H 1
  32
  33 #if ! __cpp_exceptions
  34 // Iff -fno-exceptions, transform error handling code to work without it.
  35 # define __try      if (true)
  36 # define __catch(X) if (false)
  37 # define __throw_exception_again
  38 #else
  39 // Else proceed normally.
  40 # define __try      try
  41 # define __catch(X) catch(X)
  42 # define __throw_exception_again throw
  43 #endif
  44
  45 #endif