author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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/* boost random/uniform_int.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.hpp,v 1.27 2004/07/27 03:43:32 dgregor Exp $ |
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* |
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* Revision history |
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* 2001-04-08 added min<max assertion (N. Becker) |
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* 2001-02-18 moved to individual header files |
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*/ |
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|
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#ifndef BOOST_RANDOM_UNIFORM_INT_HPP |
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#define BOOST_RANDOM_UNIFORM_INT_HPP |
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|
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#include <cassert> |
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#include <iostream> |
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#include <boost/config.hpp> |
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#include <boost/limits.hpp> |
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#include <boost/static_assert.hpp> |
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#include <boost/detail/workaround.hpp> |
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#include <boost/random/uniform_smallint.hpp> |
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#include <boost/random/detail/signed_unsigned_compare.hpp> |
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#ifdef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
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#include <boost/type_traits/is_float.hpp> |
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#endif |
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namespace boost { |
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// uniform integer distribution on [min, max] |
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template<class IntType = int> |
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class uniform_int |
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{ |
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public: |
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typedef IntType input_type; |
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typedef IntType result_type; |
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explicit uniform_int(IntType min = 0, IntType max = 9) |
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: _min(min), _max(max) |
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{ |
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#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
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// MSVC fails BOOST_STATIC_ASSERT with std::numeric_limits at class scope |
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BOOST_STATIC_ASSERT(std::numeric_limits<IntType>::is_integer); |
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#endif |
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assert(min <= max); |
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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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void reset() { } |
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// can't have member function templates out-of-line due to MSVC bugs |
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template<class Engine> |
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result_type operator()(Engine& eng) |
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{ |
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typedef typename Engine::result_type base_result; |
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base_result bmin = (eng.min)(); |
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base_result brange = (eng.max)() - (eng.min)(); |
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if(_range == 0) { |
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return _min; |
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} else if(random::equal_signed_unsigned(brange, _range)) { |
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// this will probably never happen in real life |
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// basically nothing to do; just take care we don't overflow / underflow |
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return static_cast<result_type>(eng() - bmin) + _min; |
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} else if(random::lessthan_signed_unsigned(brange, _range)) { |
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// use rejection method to handle things like 0..3 --> 0..4 |
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for(;;) { |
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// concatenate several invocations of the base RNG |
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// take extra care to avoid overflows |
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result_type limit; |
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if(_range == (std::numeric_limits<result_type>::max)()) { |
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limit = _range/(result_type(brange)+1); |
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if(_range % result_type(brange)+1 == result_type(brange)) |
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++limit; |
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} else { |
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limit = (_range+1)/(result_type(brange)+1); |
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} |
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// We consider "result" as expressed to base (brange+1): |
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// For every power of (brange+1), we determine a random factor |
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result_type result = result_type(0); |
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result_type mult = result_type(1); |
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while(mult <= limit) { |
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result += (eng() - bmin) * mult; |
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mult *= result_type(brange)+result_type(1); |
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} |
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if(mult == limit) |
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// _range+1 is an integer power of brange+1: no rejections required |
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return result; |
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// _range/mult < brange+1 -> no endless loop |
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result += uniform_int<result_type>(0, _range/mult)(eng) * mult; |
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if(result <= _range) |
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return result + _min; |
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} |
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} else { // brange > range |
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if(brange / _range > 4 /* quantization_cutoff */ ) { |
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// the new range is vastly smaller than the source range, |
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// so quantization effects are not relevant |
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return boost::uniform_smallint<result_type>(_min, _max)(eng); |
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} else { |
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// use rejection method to handle cases like 0..5 -> 0..4 |
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for(;;) { |
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base_result result = eng() - bmin; |
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// result and range are non-negative, and result is possibly larger |
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// than range, so the cast is safe |
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if(result <= static_cast<base_result>(_range)) |
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return result + _min; |
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} |
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114 |
} |
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115 |
} |
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} |
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117 |
|
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#if !defined(BOOST_NO_OPERATORS_IN_NAMESPACE) && !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) |
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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& ud) |
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122 |
{ |
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os << ud._min << " " << ud._max; |
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return os; |
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} |
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126 |
|
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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& ud) |
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130 |
{ |
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# if BOOST_WORKAROUND(_MSC_FULL_VER, BOOST_TESTED_AT(13102292)) && BOOST_MSVC > 1300 |
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return detail::extract_uniform_int(is, ud, ud.impl); |
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# else |
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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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# endif |
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} |
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#endif |
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140 |
|
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private: |
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void init() |
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{ |
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_range = _max - _min; |
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} |
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146 |
|
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result_type _min, _max, _range; |
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}; |
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149 |
|
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} // namespace boost |
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151 |
|
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#endif // BOOST_RANDOM_UNIFORM_INT_HPP |