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The C and C++ Include Header Files

cat -n /usr/include/c++/15/tr1/cstdlib

     1	// TR1 cstdlib -*- C++ -*-
     2	
     3	// Copyright (C) 2006-2025 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 tr1/cstdlib
    26	 *  This is a TR1 C++ Library header. 
    27	 */
    28	
    29	#ifndef _GLIBCXX_TR1_CSTDLIB
    30	#define _GLIBCXX_TR1_CSTDLIB 1
    31	
    32	#ifdef _GLIBCXX_SYSHDR
    33	#pragma GCC system_header
    34	#endif
    35	
    36	#include <bits/requires_hosted.h> // TR1
    37	
    38	#include <cstdlib>
    39	
    40	#if _GLIBCXX_HOSTED
    41	
    42	#if _GLIBCXX_USE_C99_STDLIB
    43	
    44	namespace std _GLIBCXX_VISIBILITY(default)
    45	{
    46	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    47	
    48	namespace tr1
    49	{
    50	#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
    51	  // types
    52	  using std::lldiv_t;
    53	
    54	  // functions
    55	  using std::llabs;
    56	  using std::lldiv;
    57	#endif
    58	
    59	  using std::atoll;
    60	  using std::strtoll;
    61	  using std::strtoull;
    62	
    63	  using std::strtof;
    64	  using std::strtold;
    65	
    66	  // overloads
    67	  using std::abs;
    68	#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
    69	  using std::div;
    70	#endif
    71	}
    72	
    73	_GLIBCXX_END_NAMESPACE_VERSION
    74	}
    75	
    76	#endif // _GLIBCXX_USE_C99_STDLIB
    77	
    78	#endif // _GLIBCXX_HOSTED
    79	
    80	#endif // _GLIBCXX_TR1_CSTDLIB