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/* boost random/bernoulli_distribution.hpp header file * * Copyright Jens Maurer 2000-2001 * Copyright Steven Watanabe 2011 * 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) * * See http://www.boost.org for most recent version including documentation. * * $Id$ * * Revision history * 2001-02-18 moved to individual header files */ #ifndef BOOST_RANDOM_BERNOULLI_DISTRIBUTION_HPP #define BOOST_RANDOM_BERNOULLI_DISTRIBUTION_HPP #include <iosfwd> #include <boost/assert.hpp> #include <boost/random/detail/config.hpp> #include <boost/random/detail/operators.hpp> namespace boost { namespace random { /** * Instantiations of class template \bernoulli_distribution model a * \random_distribution. Such a random distribution produces bool values * distributed with probabilities P(true) = p and P(false) = 1-p. p is * the parameter of the distribution. */ template<class RealType = double> class bernoulli_distribution { public: // In principle, this could work with both integer and floating-point // types. Generating floating-point random numbers in the first // place is probably more expensive, so use integer as input. typedef int input_type; typedef bool result_type; class param_type { public: typedef bernoulli_distribution distribution_type; /** * Constructs the parameters of the distribution. * * Requires: 0 <= p <= 1 */ explicit param_type(RealType p_arg = RealType(0.5)) : _p(p_arg) { BOOST_ASSERT(_p >= 0); BOOST_ASSERT(_p <= 1); } /** Returns the p parameter of the distribution. */ RealType p() const { return _p; } /** Writes the parameters to a std::ostream. */ BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR(os, param_type, parm) { os << parm._p; return os; } /** Reads the parameters from a std::istream. */ BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR(is, param_type, parm) { is >> parm._p; return is; } /** Returns true if the two sets of parameters are equal. */ BOOST_RANDOM_DETAIL_EQUALITY_OPERATOR(param_type, lhs, rhs) { return lhs._p == rhs._p; } /** Returns true if the two sets of parameters are different. */ BOOST_RANDOM_DETAIL_INEQUALITY_OPERATOR(param_type) private: RealType _p; }; /** * Constructs a \bernoulli_distribution object. * p is the parameter of the distribution. * * Requires: 0 <= p <= 1 */ explicit bernoulli_distribution(const RealType& p_arg = RealType(0.5)) : _p(p_arg) { BOOST_ASSERT(_p >= 0); BOOST_ASSERT(_p <= 1); } /** * Constructs \bernoulli_distribution from its parameters */ explicit bernoulli_distribution(const param_type& parm) : _p(parm.p()) {} // compiler-generated copy ctor and assignment operator are fine /** * Returns: The "p" parameter of the distribution. */ RealType p() const { return _p; } /** Returns the smallest value that the distribution can produce. */ bool min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return false; } /** Returns the largest value that the distribution can produce. */ bool max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return true; } /** Returns the parameters of the distribution. */ param_type param() const { return param_type(_p); } /** Sets the parameters of the distribution. */ void param(const param_type& parm) { _p = parm.p(); } /** * Effects: Subsequent uses of the distribution do not depend * on values produced by any engine prior to invoking reset. */ void reset() { } /** * Returns: a random variate distributed according to the * \bernoulli_distribution. */ template<class Engine> bool operator()(Engine& eng) const { if(_p == RealType(0)) return false; else return RealType(eng() - (eng.min)()) <= _p * RealType((eng.max)()-(eng.min)()); } /** * Returns: a random variate distributed according to the * \bernoulli_distribution with parameters specified by param. */ template<class Engine> bool operator()(Engine& eng, const param_type& parm) const { return bernoulli_distribution(parm)(eng); } /** * Writes the parameters of the distribution to a @c std::ostream. */ BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR(os, bernoulli_distribution, bd) { os << bd._p; return os; } /** * Reads the parameters of the distribution from a @c std::istream. */ BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR(is, bernoulli_distribution, bd) { is >> bd._p; return is; } /** * Returns true iff the two distributions will produce identical * sequences of values given equal generators. */ BOOST_RANDOM_DETAIL_EQUALITY_OPERATOR(bernoulli_distribution, lhs, rhs) { return lhs._p == rhs._p; } /** * Returns true iff the two distributions will produce different * sequences of values given equal generators. */ BOOST_RANDOM_DETAIL_INEQUALITY_OPERATOR(bernoulli_distribution) private: RealType _p; }; } // namespace random using random::bernoulli_distribution; } // namespace boost #endif // BOOST_RANDOM_BERNOULLI_DISTRIBUTION_HPP