experimental/numeric

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// <experimental/numeric> -*- C++ -*-
 
// Copyright (C) 2015-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
 
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.
 
/** @file experimental/numeric
 *  This is a TS C++ Library header.
 *  @ingroup libfund-ts
 */
 
//
// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
//
 
#ifndef _GLIBCXX_EXPERIMENTAL_NUMERIC
#define _GLIBCXX_EXPERIMENTAL_NUMERIC 1
 
#pragma GCC system_header
 
#if __cplusplus >= 201402L
 
#include <numeric>
#include <experimental/type_traits>
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
namespace experimental
{
inline namespace fundamentals_v2
{
#define __cpp_lib_experimental_gcd_lcm 201411
 
  /// Greatest common divisor
  template<typename _Mn, typename _Nn>
    constexpr common_type_t<_Mn, _Nn>
    gcd(_Mn __m, _Nn __n) noexcept
    {
      static_assert(is_integral_v<_Mn>,
          "std::experimental::gcd arguments must be integers");
      static_assert(is_integral_v<_Nn>,
          "std::experimental::gcd arguments must be integers");
      static_assert(_Mn(2) != _Mn(1),
          "std::experimental::gcd arguments must not be bool");
      static_assert(_Nn(2) != _Nn(1),
          "std::experimental::gcd arguments must not be bool");
      using _Up = make_unsigned_t<common_type_t<_Mn, _Nn>>;
      return std::__detail::__gcd(std::__detail::__absu<_Up>(__m),
                                  std::__detail::__absu<_Up>(__n));
    }
 
  /// Least common multiple
  template<typename _Mn, typename _Nn>
    constexpr common_type_t<_Mn, _Nn>
    lcm(_Mn __m, _Nn __n)
    {
      static_assert(is_integral_v<_Mn>,
          "std::experimental::lcm arguments must be integers");
      static_assert(is_integral_v<_Nn>,
          "std::experimental::lcm arguments must be integers");
      static_assert(_Mn(2) != _Mn(1),
          "std::experimental::lcm arguments must not be bool");
      static_assert(_Nn(2) != _Nn(1),
          "std::experimental::lcm arguments must not be bool");
      using _Up = make_unsigned_t<common_type_t<_Mn, _Nn>>;
      return std::__detail::__lcm(std::__detail::__absu<_Up>(__m),
                                  std::__detail::__absu<_Up>(__n));
    }
} // namespace fundamentals_v2
} // namespace experimental
 
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
 
#endif // __cplusplus <= 201103L
 
#endif // _GLIBCXX_EXPERIMENTAL_NUMERIC