86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
/* boost random/detail/uniform_int_float.hpp header file
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*
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* Copyright Jens Maurer 2000-2001
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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: uniform_int_float.hpp 52492 2009-04-19 14:55:57Z steven_watanabe $
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*
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*/
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#ifndef BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
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#define BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
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#include <boost/config.hpp>
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#include <boost/random/detail/config.hpp>
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#include <boost/random/uniform_01.hpp>
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namespace boost {
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namespace random {
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namespace detail {
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template<class UniformRandomNumberGenerator, class IntType = unsigned long>
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class uniform_int_float
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{
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public:
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typedef UniformRandomNumberGenerator base_type;
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typedef IntType result_type;
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uniform_int_float(base_type rng, IntType min_arg = 0, IntType max_arg = 0xffffffff)
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: _rng(rng), _min(min_arg), _max(max_arg)
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{
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init();
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}
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; }
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; }
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base_type& base() { return _rng.base(); }
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const base_type& base() const { return _rng.base(); }
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result_type operator()()
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{
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return static_cast<IntType>(_rng() * _range) + _min;
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}
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#ifndef BOOST_RANDOM_NO_STREAM_OPERATORS
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template<class CharT, class Traits>
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friend std::basic_ostream<CharT,Traits>&
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operator<<(std::basic_ostream<CharT,Traits>& os, const uniform_int_float& ud)
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{
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os << ud._min << " " << ud._max;
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return os;
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}
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template<class CharT, class Traits>
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friend std::basic_istream<CharT,Traits>&
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operator>>(std::basic_istream<CharT,Traits>& is, uniform_int_float& ud)
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{
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is >> std::ws >> ud._min >> std::ws >> ud._max;
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ud.init();
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return is;
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}
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#endif
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private:
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void init()
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{
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_range = static_cast<base_result>(_max-_min)+1;
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}
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typedef typename base_type::result_type base_result;
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uniform_01<base_type> _rng;
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result_type _min, _max;
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base_result _range;
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};
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} // namespace detail
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} // namespace random
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} // namespace boost
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#endif // BOOST_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
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