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// <experimental/random> -*- C++ -*- |
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// Copyright (C) 2015-2021 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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|
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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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/** @file experimental/random |
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* This is a TS C++ Library header. |
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* @ingroup libfund-ts |
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*/ |
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#ifndef _GLIBCXX_EXPERIMENTAL_RANDOM |
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#define _GLIBCXX_EXPERIMENTAL_RANDOM 1 |
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|
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#if __cplusplus >= 201402L |
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#include <random> |
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#include <experimental/bits/lfts_config.h> |
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|
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namespace std { |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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namespace experimental { |
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inline namespace fundamentals_v2 { |
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#define __cpp_lib_experimental_randint 201511 |
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|
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inline std::default_random_engine& |
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_S_randint_engine() |
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{ |
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static thread_local default_random_engine __eng{random_device{}()}; |
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return __eng; |
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} |
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|
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// 13.2.2.1, Function template randint |
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template<typename _IntType> |
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inline _IntType |
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randint(_IntType __a, _IntType __b) |
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{ |
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static_assert(is_integral<_IntType>::value && sizeof(_IntType) > 1, |
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"argument must be an integer type"); |
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using _Dist = std::uniform_int_distribution<_IntType>; |
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// This relies on the fact our uniform_int_distribution is stateless, |
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// otherwise we'd need a static thread_local _Dist and pass it |
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// _Dist::param_type{__a, __b}. |
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return _Dist(__a, __b)(_S_randint_engine()); |
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} |
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|
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inline void |
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reseed() |
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{ |
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_S_randint_engine().seed(random_device{}()); |
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} |
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|
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inline void |
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reseed(default_random_engine::result_type __value) |
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{ |
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_S_randint_engine().seed(__value); |
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} |
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} // namespace fundamentals_v2 |
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} // namespace experimental |
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace std |
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|
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#endif // C++14 |
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#endif // _GLIBCXX_EXPERIMENTAL_RANDOM |
