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The C and C++ Include Header Files

cat -n /usr/include/c++/15/bits/cxxabi_forced.h

     1	// cxxabi.h subset for cancellation -*- C++ -*-
     2	
     3	// Copyright (C) 2007-2025 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	#ifdef _GLIBCXX_SYSHDR
    35	#pragma GCC system_header
    36	#endif
    37	
    38	#pragma GCC visibility push(default)
    39	
    40	#ifdef __cplusplus
    41	namespace __cxxabiv1
    42	{
    43	  /**
    44	   *  @brief Thrown as part of forced unwinding.
    45	   *  @ingroup exceptions
    46	   *
    47	   *  A magic placeholder class that can be caught by reference to
    48	   *  recognize forced unwinding.
    49	   */
    50	  class __forced_unwind
    51	  {
    52	    virtual ~__forced_unwind() throw();
    53	
    54	    // Prevent catch by value.
    55	    virtual void __pure_dummy() = 0;
    56	  };
    57	}
    58	#endif // __cplusplus
    59	
    60	#pragma GCC visibility pop
    61	
    62	#endif // __CXXABI_FORCED_H