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103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
// <experimental/numeric> -*- C++ -*-
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// Copyright (C) 2015-2016 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file experimental/numeric
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* This is a TS C++ Library header.
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*/
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//
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// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
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//
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#ifndef _GLIBCXX_EXPERIMENTAL_NUMERIC
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#define _GLIBCXX_EXPERIMENTAL_NUMERIC 1
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#pragma GCC system_header
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#if __cplusplus <= 201103L
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# include <bits/c++14_warning.h>
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#else
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#include <numeric>
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#include <experimental/type_traits>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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namespace experimental
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{
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inline namespace fundamentals_v2
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#define __cpp_lib_experimental_gcd_lcm 201411
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// std::abs is not constexpr and doesn't support unsigned integers.
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template<typename _Tp>
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constexpr
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enable_if_t<__and_<is_integral<_Tp>, is_signed<_Tp>>::value, _Tp>
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__abs(_Tp __val)
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{ return __val < 0 ? -__val : __val; }
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template<typename _Tp>
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constexpr
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enable_if_t<__and_<is_integral<_Tp>, is_unsigned<_Tp>>::value, _Tp>
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__abs(_Tp __val)
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{ return __val; }
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// Greatest common divisor
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template<typename _Mn, typename _Nn>
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constexpr common_type_t<_Mn, _Nn>
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gcd(_Mn __m, _Nn __n)
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{
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static_assert(is_integral<_Mn>::value, "arguments to gcd are integers");
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static_assert(is_integral<_Nn>::value, "arguments to gcd are integers");
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return __m == 0 ? fundamentals_v2::__abs(__n)
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: __n == 0 ? fundamentals_v2::__abs(__m)
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: fundamentals_v2::gcd(__n, __m % __n);
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}
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// Least common multiple
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template<typename _Mn, typename _Nn>
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constexpr common_type_t<_Mn, _Nn>
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lcm(_Mn __m, _Nn __n)
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{
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static_assert(is_integral<_Mn>::value, "arguments to lcm are integers");
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static_assert(is_integral<_Nn>::value, "arguments to lcm are integers");
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return (__m != 0 && __n != 0)
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? (fundamentals_v2::__abs(__m) / fundamentals_v2::gcd(__m, __n))
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* fundamentals_v2::__abs(__n)
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: 0;
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace fundamentals_v2
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} // namespace experimental
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} // namespace std
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#endif // __cplusplus <= 201103L
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#endif // _GLIBCXX_EXPERIMENTAL_NUMERIC
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