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// <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
// 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
// <>.
/** @file experimental/random
* This is a TS C++ Library header.
#include <random>
#include <experimental/bits/lfts_config.h>
namespace std {
namespace experimental {
inline namespace fundamentals_v2 {
#define __cpp_lib_experimental_randint 201511
inline std::default_random_engine&
static thread_local default_random_engine __eng{random_device{}()};
return __eng;
//, 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
inline void
reseed(default_random_engine::result_type __value)
} // namespace fundamentals_v2
} // namespace experimental
} // namespace std