f2e79496bf
* include/experimental/numeric (gcd, lcm): Make bool arguments ill-formed. * include/std/numeric (gcd, lcm): Likewise. * testsuite/26_numerics/gcd/gcd_neg.cc: New test. * testsuite/26_numerics/lcm/lcm_neg.cc: New test. From-SVN: r240919
163 lines
5.0 KiB
C++
163 lines
5.0 KiB
C++
// <numeric> -*- C++ -*-
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// Copyright (C) 2001-2016 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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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996,1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file include/numeric
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_NUMERIC
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#define _GLIBCXX_NUMERIC 1
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#pragma GCC system_header
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#include <bits/c++config.h>
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#include <bits/stl_iterator_base_types.h>
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#include <bits/stl_numeric.h>
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#ifdef _GLIBCXX_PARALLEL
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# include <parallel/numeric>
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#endif
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/**
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* @defgroup numerics Numerics
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*
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* Components for performing numeric operations. Includes support for
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* for complex number types, random number generation, numeric
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* (n-at-a-time) arrays, generalized numeric algorithms, and special
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* math functions.
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*/
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#if __cplusplus >= 201402L
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#include <type_traits>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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namespace __detail
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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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_integral(_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_integral(_Tp __val)
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{ return __val; }
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void __abs_integral(bool) = delete;
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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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return __m == 0 ? __detail::__abs_integral(__n)
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: __n == 0 ? __detail::__abs_integral(__m)
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: __detail::__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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return (__m != 0 && __n != 0)
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? (__detail::__abs_integral(__m) / __detail::__gcd(__m, __n))
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* __detail::__abs_integral(__n)
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: 0;
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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}
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#if __cplusplus > 201402L
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#define __cpp_lib_gcd 201606
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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, "gcd arguments are integers");
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static_assert(is_integral<_Nn>::value, "gcd arguments are integers");
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static_assert(!is_same<_Mn, bool>::value, "gcd arguments are not bools");
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static_assert(!is_same<_Nn, bool>::value, "gcd arguments are not bools");
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return __detail::__gcd(__m, __n);
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}
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#define __cpp_lib_lcm 201606
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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, "lcm arguments are integers");
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static_assert(is_integral<_Nn>::value, "lcm arguments are integers");
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static_assert(!is_same<_Mn, bool>::value, "lcm arguments are not bools");
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static_assert(!is_same<_Nn, bool>::value, "lcm arguments are not bools");
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return __detail::__lcm(__m, __n);
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}
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#endif // C++17
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // C++14
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#endif /* _GLIBCXX_NUMERIC */
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