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123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
/* boost random/variate_generator.hpp header file
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*
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* Copyright Jens Maurer 2002
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* Copyright Steven Watanabe 2011
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* Distributed under the Boost Software License, Version 1.0. (See
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* accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org for most recent version including documentation.
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*
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* $Id$
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*
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*/
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#ifndef BOOST_RANDOM_RANDOM_GENERATOR_HPP
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#define BOOST_RANDOM_RANDOM_GENERATOR_HPP
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#include <boost/random/detail/ptr_helper.hpp>
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#include <boost/random/detail/disable_warnings.hpp>
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namespace boost {
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/// \cond hide_private_members
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namespace random {
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///\endcond
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/**
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* A random variate generator is used to join a random number
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* generator together with a random number distribution.
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* Boost.Random provides a vast choice of \generators as well
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* as \distributions.
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*
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* The argument for the template parameter Engine shall be of
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* the form U, U&, or U*, where U models a
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* \uniform_random_number_generator. Then, the member
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* engine_value_type names U (not the pointer or reference to U).
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*
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* Specializations of @c variate_generator satisfy the
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* requirements of CopyConstructible. They also satisfy the
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* requirements of Assignable unless the template parameter
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* Engine is of the form U&.
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*
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* The complexity of all functions specified in this section
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* is constant. No function described in this section except
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* the constructor throws an exception.
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*/
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template<class Engine, class Distribution>
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class variate_generator
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{
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private:
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typedef boost::random::detail::ptr_helper<Engine> helper_type;
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public:
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typedef typename helper_type::value_type engine_value_type;
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typedef Engine engine_type;
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typedef Distribution distribution_type;
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typedef typename Distribution::result_type result_type;
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/**
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* Constructs a @c variate_generator object with the associated
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* \uniform_random_number_generator eng and the associated
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* \random_distribution d.
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*
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* Throws: If and what the copy constructor of Engine or
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* Distribution throws.
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*/
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variate_generator(Engine e, Distribution d)
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: _eng(e), _dist(d) { }
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/** Returns: distribution()(engine()) */
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result_type operator()() { return _dist(engine()); }
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/**
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* Returns: distribution()(engine(), value).
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*/
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template<class T>
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result_type operator()(const T& value) { return _dist(engine(), value); }
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/**
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* Returns: A reference to the associated uniform random number generator.
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*/
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engine_value_type& engine() { return helper_type::ref(_eng); }
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/**
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* Returns: A reference to the associated uniform random number generator.
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*/
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const engine_value_type& engine() const { return helper_type::ref(_eng); }
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/** Returns: A reference to the associated \random_distribution. */
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distribution_type& distribution() { return _dist; }
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/**
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* Returns: A reference to the associated random distribution.
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*/
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const distribution_type& distribution() const { return _dist; }
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/**
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* Precondition: distribution().min() is well-formed
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*
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* Returns: distribution().min()
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*/
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (distribution().min)(); }
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/**
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* Precondition: distribution().max() is well-formed
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*
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* Returns: distribution().max()
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*/
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (distribution().max)(); }
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private:
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Engine _eng;
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distribution_type _dist;
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};
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} // namespace random
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using random::variate_generator;
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} // namespace boost
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#include <boost/random/detail/enable_warnings.hpp>
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#endif // BOOST_RANDOM_RANDOM_GENERATOR_HPP
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