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The C and C++ Include Header Files

/usr/include/c++/13/bits/exception_defines.h


$ cat -n /usr/include/c++/13/bits/exception_defines.h

     1	// -fno-exceptions Support -*- C++ -*-
     2	
     3	// Copyright (C) 2001-2023 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