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Contents
#ifndef BOOST_UTILITY_DETAIL_MINSTD_RAND_HPP_INCLUDED
#define BOOST_UTILITY_DETAIL_MINSTD_RAND_HPP_INCLUDED
// Copyright 2017 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// An implementation of minstd_rand that does not require
// the Random library
#include <boost/cstdint.hpp>
namespace boost
{
namespace detail
{
class minstd_rand
{
private:
boost::uint_least32_t x_;
enum { a = 48271, m = 2147483647 };
public:
minstd_rand(): x_( 1 )
{
}
explicit minstd_rand( boost::uint_least32_t x ): x_( x % m )
{
if( x_ == 0 )
{
x_ = 1;
}
}
boost::uint_least32_t operator()()
{
boost::uint_least64_t y = x_;
y = ( a * y ) % m;
x_ = static_cast<boost::uint_least32_t>( y );
return x_;
}
};
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_UTILITY_DETAIL_MINSTD_RAND_HPP_INCLUDED
Version data entries
19 entries across 19 versions & 1 rubygems