File: randomizer.cc

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// Copyright (C) 2006 Graydon Hoare <graydon@pobox.com>
//
// This program is made available under the GNU GPL version 2.0 or
// greater. See the accompanying file COPYING for details.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE.

#include "base.hh"
#include "randomizer.hh"
#include <boost/random/uniform_int.hpp>
#include <boost/random/bernoulli_distribution.hpp>
#include <boost/random/variate_generator.hpp>

typedef boost::mt19937 & rng_t;

bool randomizer::flip(size_t n)
{
  return bernoulli(1.0 / static_cast<double>(n));
}

size_t randomizer::uniform(size_t n)
{
  typedef boost::uniform_int<size_t> dist_t;
  return boost::variate_generator<rng_t, dist_t>(rng, dist_t(0, n-1))();
}

bool randomizer::bernoulli(double p)
{
  typedef boost::bernoulli_distribution<double> dist_t;
  return boost::variate_generator<rng_t, dist_t>(rng, dist_t(p))();
}

// Local Variables:
// mode: C++
// fill-column: 76
// c-file-style: "gnu"
// indent-tabs-mode: nil
// End:
// vim: et:sw=2:sts=2:ts=2:cino=>2s,{s,\:s,+s,t0,g0,^-2,e-2,n-2,p2s,(0,=s: