| // <experimental/random> -*- C++ -*- |
| |
| // Copyright (C) 2015-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file experimental/random |
| * This is a TS C++ Library header. |
| * @ingroup libfund-ts |
| */ |
| |
| #ifndef _GLIBCXX_EXPERIMENTAL_RANDOM |
| #define _GLIBCXX_EXPERIMENTAL_RANDOM 1 |
| |
| #if __cplusplus >= 201402L |
| #include <random> |
| #include <experimental/bits/lfts_config.h> |
| |
| namespace std { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| namespace experimental { |
| inline namespace fundamentals_v2 { |
| #define __cpp_lib_experimental_randint 201511 |
| |
| inline std::default_random_engine& |
| _S_randint_engine() |
| { |
| static thread_local default_random_engine __eng{random_device{}()}; |
| return __eng; |
| } |
| |
| // 13.2.2.1, Function template randint |
| template<typename _IntType> |
| [[__nodiscard__]] |
| inline _IntType |
| randint(_IntType __a, _IntType __b) |
| { |
| static_assert(is_integral<_IntType>::value && sizeof(_IntType) > 1, |
| "argument must be an integer type"); |
| using _Dist = std::uniform_int_distribution<_IntType>; |
| // This relies on the fact our uniform_int_distribution is stateless, |
| // otherwise we'd need a static thread_local _Dist and pass it |
| // _Dist::param_type{__a, __b}. |
| return _Dist(__a, __b)(_S_randint_engine()); |
| } |
| |
| inline void |
| reseed() |
| { |
| _S_randint_engine().seed(random_device{}()); |
| } |
| |
| inline void |
| reseed(default_random_engine::result_type __value) |
| { |
| _S_randint_engine().seed(__value); |
| } |
| } // namespace fundamentals_v2 |
| } // namespace experimental |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace std |
| |
| #endif // C++14 |
| #endif // _GLIBCXX_EXPERIMENTAL_RANDOM |