The C and C++ Include Header Files

/usr/include/c++/11/experimental/numeric


$ cat -n /usr/include/c++/11/experimental/numeric

     1	// <experimental/numeric> -*- C++ -*-
     2	
     3	// Copyright (C) 2015-2021 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 experimental/numeric
    26	 *  This is a TS C++ Library header.
    27	 *  @ingroup libfund-ts
    28	 */
    29	
    30	//
    31	// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
    32	//
    33	
    34	#ifndef _GLIBCXX_EXPERIMENTAL_NUMERIC
    35	#define _GLIBCXX_EXPERIMENTAL_NUMERIC 1
    36	
    37	#pragma GCC system_header
    38	
    39	#if __cplusplus >= 201402L
    40	
    41	#include <numeric>
    42	#include <experimental/type_traits>
    43	
    44	namespace std _GLIBCXX_VISIBILITY(default)
    45	{
    46	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    47	
    48	namespace experimental
    49	{
    50	inline namespace fundamentals_v2
    51	{
    52	#define __cpp_lib_experimental_gcd_lcm 201411
    53	
    54	  /// Greatest common divisor
    55	  template<typename _Mn, typename _Nn>
    56	    constexpr common_type_t<_Mn, _Nn>
    57	    gcd(_Mn __m, _Nn __n) noexcept
    58	    {
    59	      static_assert(is_integral_v<_Mn> && is_integral_v<_Nn>,
    60			    "std::experimental::gcd arguments must be integers");
    61	      static_assert(_Mn(2) == 2 && _Nn(2) == 2,
    62			    "std::experimental::gcd arguments must not be bool");
    63	      namespace __detail = std::__detail;
    64	      using _Ct = common_type_t<_Mn, _Nn>;
    65	      const _Ct __m2 = __detail::__abs_r<_Ct>(__m);
    66	      const _Ct __n2 = __detail::__abs_r<_Ct>(__n);
    67	      return __detail::__gcd<make_unsigned_t<_Ct>>(__m2, __n2);
    68	    }
    69	
    70	  /// Least common multiple
    71	  template<typename _Mn, typename _Nn>
    72	    constexpr common_type_t<_Mn, _Nn>
    73	    lcm(_Mn __m, _Nn __n)
    74	    {
    75	      static_assert(is_integral_v<_Mn> && is_integral_v<_Nn>,
    76		  "std::experimental::lcm arguments must be integers");
    77	      static_assert(_Mn(2) == 2 && _Nn(2) == 2,
    78		  "std::experimental::lcm arguments must not be bool");
    79	      namespace __detail = std::__detail;
    80	      using _Ct = common_type_t<_Mn, _Nn>;
    81	      const _Ct __m2 = __detail::__abs_r<_Ct>(__m);
    82	      const _Ct __n2 = __detail::__abs_r<_Ct>(__n);
    83	      if (__m2 == 0 || __n2 == 0)
    84		return 0;
    85	      _Ct __r = __m2 / __detail::__gcd<make_unsigned_t<_Ct>>(__m2, __n2);
    86	
    87	#if defined _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
    88	      if _GLIBCXX17_CONSTEXPR (is_signed_v<_Ct>)
    89		if (__builtin_is_constant_evaluated())
    90		  return __r * __n2; // constant evaluation can detect overflow here.
    91	#endif
    92	
    93	      bool __overflow = __builtin_mul_overflow(__r, __n2, &__r);
    94	      __glibcxx_assert(!__overflow);
    95	      return __r;
    96	    }
    97	} // namespace fundamentals_v2
    98	} // namespace experimental
    99	
   100	_GLIBCXX_END_NAMESPACE_VERSION
   101	} // namespace std
   102	
   103	#endif // __cplusplus <= 201103L
   104	
   105	#endif // _GLIBCXX_EXPERIMENTAL_NUMERIC