The C and C++ Include Header Files

/usr/include/c++/11/tr2/ratio


$ cat -n /usr/include/c++/11/tr2/ratio

     1	// TR2 <ratio> -*- C++ -*-
     2	
     3	// Copyright (C) 2010-2021 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 tr2/ratio
    26	 *  This is a TR2 C++ Library header.
    27	 */
    28	
    29	#include <ratio>
    30	
    31	namespace std _GLIBCXX_VISIBILITY(default)
    32	{
    33	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    34	
    35	namespace tr2
    36	{
    37	  template<intmax_t _Pn, size_t _Bit,
    38		     bool = _Bit < static_cast<size_t>
    39				  (std::numeric_limits<intmax_t>::digits)>
    40	    struct __safe_lshift
    41	    { static const intmax_t __value = 0; };
    42	
    43	    template<intmax_t _Pn, size_t _Bit>
    44	      struct __safe_lshift<_Pn, _Bit, true>
    45	      { static const intmax_t __value = _Pn << _Bit; };
    46	
    47	  /// Add binary prefixes (IEC 60027-2 A.2 and ISO/IEC 80000).
    48	  typedef ratio<__safe_lshift<1, 10>::__value, 1> kibi;
    49	  typedef ratio<__safe_lshift<1, 20>::__value, 1> mebi;
    50	  typedef ratio<__safe_lshift<1, 30>::__value, 1> gibi;
    51	  typedef ratio<__safe_lshift<1, 40>::__value, 1> tebi;
    52	  typedef ratio<__safe_lshift<1, 50>::__value, 1> pebi;
    53	  typedef ratio<__safe_lshift<1, 60>::__value, 1> exbi;
    54	  //typedef ratio<__safe_lshift<1, 70>::__value, 1> zebi;
    55	  //typedef ratio<__safe_lshift<1, 80>::__value, 1> yobi;
    56	}
    57	
    58	_GLIBCXX_END_NAMESPACE_VERSION
    59	}