81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
// <experimental/random> -*- C++ -*-
|
|
|
|
// Copyright (C) 2015-2018 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.
|
|
*/
|
|
|
|
#ifndef _GLIBCXX_EXPERIMENTAL_RANDOM
|
|
#define _GLIBCXX_EXPERIMENTAL_RANDOM 1
|
|
|
|
#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
|