1// <experimental/numeric> -*- C++ -*-
2
3// Copyright (C) 2015-2019 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 */
28
29//
30// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
31//
32
33#ifndef _GLIBCXX_EXPERIMENTAL_NUMERIC
34#define _GLIBCXX_EXPERIMENTAL_NUMERIC 1
35
36#pragma GCC system_header
37
38#if __cplusplus >= 201402L
39
40#include <numeric>
41#include <experimental/type_traits>
42
43namespace std _GLIBCXX_VISIBILITY(default)
44{
45_GLIBCXX_BEGIN_NAMESPACE_VERSION
46
47namespace experimental
48{
49inline namespace fundamentals_v2
50{
51#define __cpp_lib_experimental_gcd_lcm 201411
52
53  /// Greatest common divisor
54  template<typename _Mn, typename _Nn>
55    constexpr common_type_t<_Mn, _Nn>
56    gcd(_Mn __m, _Nn __n) noexcept
57    {
58      static_assert(is_integral_v<_Mn>,
59	  "std::experimental::gcd arguments must be integers");
60      static_assert(is_integral_v<_Nn>,
61	  "std::experimental::gcd arguments must be integers");
62      static_assert(_Mn(2) != _Mn(1),
63	  "std::experimental::gcd arguments must not be bool");
64      static_assert(_Nn(2) != _Nn(1),
65	  "std::experimental::gcd arguments must not be bool");
66      using _Up = make_unsigned_t<common_type_t<_Mn, _Nn>>;
67      return std::__detail::__gcd(std::__detail::__absu<_Up>(__m),
68				  std::__detail::__absu<_Up>(__n));
69    }
70
71  /// Least common multiple
72  template<typename _Mn, typename _Nn>
73    constexpr common_type_t<_Mn, _Nn>
74    lcm(_Mn __m, _Nn __n)
75    {
76      static_assert(is_integral_v<_Mn>,
77	  "std::experimental::lcm arguments must be integers");
78      static_assert(is_integral_v<_Nn>,
79	  "std::experimental::lcm arguments must be integers");
80      static_assert(_Mn(2) != _Mn(1),
81	  "std::experimental::lcm arguments must not be bool");
82      static_assert(_Nn(2) != _Nn(1),
83	  "std::experimental::lcm arguments must not be bool");
84      using _Up = make_unsigned_t<common_type_t<_Mn, _Nn>>;
85      return std::__detail::__lcm(std::__detail::__absu<_Up>(__m),
86				  std::__detail::__absu<_Up>(__n));
87    }
88} // namespace fundamentals_v2
89} // namespace experimental
90
91_GLIBCXX_END_NAMESPACE_VERSION
92} // namespace std
93
94#endif // __cplusplus <= 201103L
95
96#endif // _GLIBCXX_EXPERIMENTAL_NUMERIC
97