1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/epoc32/include/stdapis/boost/random/bernoulli_distribution.hpp	Tue Mar 16 16:12:26 2010 +0000
     1.3 @@ -0,0 +1,80 @@
     1.4 +/* boost random/bernoulli_distribution.hpp header file
     1.5 + *
     1.6 + * Copyright Jens Maurer 2000-2001
     1.7 + * Distributed under the Boost Software License, Version 1.0. (See
     1.8 + * accompanying file LICENSE_1_0.txt or copy at
     1.9 + * http://www.boost.org/LICENSE_1_0.txt)
    1.10 + *
    1.11 + * See http://www.boost.org for most recent version including documentation.
    1.12 + *
    1.13 + * $Id: bernoulli_distribution.hpp,v 1.19 2004/07/27 03:43:32 dgregor Exp $
    1.14 + *
    1.15 + * Revision history
    1.16 + *  2001-02-18  moved to individual header files
    1.17 + */
    1.18 +
    1.19 +#ifndef BOOST_RANDOM_BERNOULLI_DISTRIBUTION_HPP
    1.20 +#define BOOST_RANDOM_BERNOULLI_DISTRIBUTION_HPP
    1.21 +
    1.22 +#include <cassert>
    1.23 +#include <iostream>
    1.24 +
    1.25 +namespace boost {
    1.26 +
    1.27 +// Bernoulli distribution: p(true) = p, p(false) = 1-p   (boolean)
    1.28 +template<class RealType = double>
    1.29 +class bernoulli_distribution
    1.30 +{
    1.31 +public:
    1.32 +  // In principle, this could work with both integer and floating-point
    1.33 +  // types.  Generating floating-point random numbers in the first
    1.34 +  // place is probably more expensive, so use integer as input.
    1.35 +  typedef int input_type;
    1.36 +  typedef bool result_type;
    1.37 +
    1.38 +  explicit bernoulli_distribution(const RealType& p = RealType(0.5)) 
    1.39 +    : _p(p)
    1.40 +  {
    1.41 +    assert(p >= 0);
    1.42 +    assert(p <= 1);
    1.43 +  }
    1.44 +
    1.45 +  // compiler-generated copy ctor and assignment operator are fine
    1.46 +
    1.47 +  RealType p() const { return _p; }
    1.48 +  void reset() { }
    1.49 +
    1.50 +  template<class Engine>
    1.51 +  result_type operator()(Engine& eng)
    1.52 +  {
    1.53 +    if(_p == RealType(0))
    1.54 +      return false;
    1.55 +    else
    1.56 +      return RealType(eng() - (eng.min)()) <= _p * RealType((eng.max)()-(eng.min)());
    1.57 +  }
    1.58 +
    1.59 +#if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
    1.60 +  template<class CharT, class Traits>
    1.61 +  friend std::basic_ostream<CharT,Traits>&
    1.62 +  operator<<(std::basic_ostream<CharT,Traits>& os, const bernoulli_distribution& bd)
    1.63 +  {
    1.64 +    os << bd._p;
    1.65 +    return os;
    1.66 +  }
    1.67 +
    1.68 +  template<class CharT, class Traits>
    1.69 +  friend std::basic_istream<CharT,Traits>&
    1.70 +  operator>>(std::basic_istream<CharT,Traits>& is, bernoulli_distribution& bd)
    1.71 +  {
    1.72 +    is >> std::ws >> bd._p;
    1.73 +    return is;
    1.74 +  }
    1.75 +#endif
    1.76 +
    1.77 +private:
    1.78 +  RealType _p;
    1.79 +};
    1.80 +
    1.81 +} // namespace boost
    1.82 +
    1.83 +#endif // BOOST_RANDOM_BERNOULLI_DISTRIBUTION_HPP