1 // <experimental/numeric> -*- C++ -*-
3 // Copyright (C) 2015-2016 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file experimental/numeric
26 * This is a TS C++ Library header.
30 // N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
33 #ifndef _GLIBCXX_EXPERIMENTAL_NUMERIC
34 #define _GLIBCXX_EXPERIMENTAL_NUMERIC 1
36 #pragma GCC system_header
38 #if __cplusplus <= 201103L
39 # include <bits/c++14_warning.h>
42 #include <experimental/type_traits>
45 namespace std _GLIBCXX_VISIBILITY(default)
47 namespace experimental
49 inline namespace fundamentals_v2
51 _GLIBCXX_BEGIN_NAMESPACE_VERSION
53 #define __cpp_lib_experimental_gcd_lcm 201411
55 // Greatest common divisor
56 template<typename _Mn, typename _Nn>
57 constexpr common_type_t<_Mn, _Nn>
60 static_assert(is_integral<_Mn>::value, "arguments to gcd are integers");
61 static_assert(is_integral<_Nn>::value, "arguments to gcd are integers");
63 return __m == 0 ? std::abs(__n)
64 : __n == 0 ? std::abs(__m)
65 : fundamentals_v2::gcd(__n, __m % __n);
68 // Least common multiple
69 template<typename _Mn, typename _Nn>
70 constexpr common_type_t<_Mn, _Nn>
73 static_assert(is_integral<_Mn>::value, "arguments to lcm are integers");
74 static_assert(is_integral<_Nn>::value, "arguments to lcm are integers");
76 return (__m != 0 && __n != 0)
77 ? (std::abs(__m) / fundamentals_v2::gcd(__m, __n)) * std::abs(__n)
81 _GLIBCXX_END_NAMESPACE_VERSION
82 } // namespace fundamentals_v2
83 } // namespace experimental
86 #endif // __cplusplus <= 201103L
88 #endif // _GLIBCXX_EXPERIMENTAL_NUMERIC