// <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> 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 SIMPAN PERUBAHAN