author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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/* boost random/tausworthe.hpp header file |
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* |
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* Copyright Jens Maurer 2002 |
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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: linear_feedback_shift.hpp,v 1.12 2005/05/21 15:57:00 dgregor Exp $ |
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* |
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*/ |
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|
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#ifndef BOOST_RANDOM_LINEAR_FEEDBACK_SHIFT_HPP |
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#define BOOST_RANDOM_LINEAR_FEEDBACK_SHIFT_HPP |
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#include <iostream> |
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#include <cassert> |
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#include <stdexcept> |
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#include <boost/config.hpp> |
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#include <boost/static_assert.hpp> |
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#include <boost/limits.hpp> |
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namespace boost { |
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namespace random { |
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// Tausworte 1965 |
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template<class UIntType, int w, int k, int q, int s, UIntType val> |
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class linear_feedback_shift |
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{ |
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public: |
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typedef UIntType result_type; |
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// avoid the warning trouble when using (1<<w) on 32 bit machines |
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BOOST_STATIC_CONSTANT(bool, has_fixed_range = false); |
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BOOST_STATIC_CONSTANT(int, word_size = w); |
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BOOST_STATIC_CONSTANT(int, exponent1 = k); |
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BOOST_STATIC_CONSTANT(int, exponent2 = q); |
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BOOST_STATIC_CONSTANT(int, step_size = s); |
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return 0; } |
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return wordmask; } |
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// MSVC 6 and possibly others crash when encountering complicated integral |
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// constant expressions. Avoid the checks for now. |
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// BOOST_STATIC_ASSERT(w > 0); |
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// BOOST_STATIC_ASSERT(q > 0); |
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// BOOST_STATIC_ASSERT(k < w); |
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// BOOST_STATIC_ASSERT(0 < 2*q && 2*q < k); |
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// BOOST_STATIC_ASSERT(0 < s && s <= k-q); |
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explicit linear_feedback_shift(UIntType s0 = 341) : wordmask(0) |
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{ |
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// MSVC fails BOOST_STATIC_ASSERT with std::numeric_limits at class scope |
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#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
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BOOST_STATIC_ASSERT(std::numeric_limits<UIntType>::is_integer); |
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BOOST_STATIC_ASSERT(!std::numeric_limits<UIntType>::is_signed); |
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#endif |
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// avoid "left shift count >= with of type" warning |
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for(int i = 0; i < w; ++i) |
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wordmask |= (1u << i); |
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seed(s0); |
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} |
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template<class It> linear_feedback_shift(It& first, It last) : wordmask(0) |
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{ |
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// MSVC fails BOOST_STATIC_ASSERT with std::numeric_limits at class scope |
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#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS |
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BOOST_STATIC_ASSERT(std::numeric_limits<UIntType>::is_integer); |
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BOOST_STATIC_ASSERT(!std::numeric_limits<UIntType>::is_signed); |
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#endif |
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// avoid "left shift count >= with of type" warning |
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for(int i = 0; i < w; ++i) |
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wordmask |= (1u << i); |
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seed(first, last); |
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} |
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void seed(UIntType s0 = 341) { assert(s0 >= (1 << (w-k))); value = s0; } |
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template<class It> void seed(It& first, It last) |
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{ |
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if(first == last) |
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throw std::invalid_argument("linear_feedback_shift::seed"); |
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value = *first++; |
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assert(value >= (1 << (w-k))); |
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} |
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result_type operator()() |
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{ |
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const UIntType b = (((value << q) ^ value) & wordmask) >> (k-s); |
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const UIntType mask = ( (~static_cast<UIntType>(0)) << (w-k) ) & wordmask; |
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value = ((value & mask) << s) ^ b; |
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return value; |
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} |
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bool validation(result_type x) const { return val == x; } |
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#ifndef BOOST_NO_OPERATORS_IN_NAMESPACE |
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#ifndef 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, linear_feedback_shift x) |
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{ os << x.value; return os; } |
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104 |
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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, linear_feedback_shift& x) |
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{ is >> x.value; return is; } |
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109 |
#endif |
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110 |
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friend bool operator==(linear_feedback_shift x, linear_feedback_shift y) |
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{ return x.value == y.value; } |
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friend bool operator!=(linear_feedback_shift x, linear_feedback_shift y) |
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{ return !(x == y); } |
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115 |
#else |
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// Use a member function; Streamable concept not supported. |
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bool operator==(linear_feedback_shift rhs) const |
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{ return value == rhs.value; } |
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bool operator!=(linear_feedback_shift rhs) const |
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{ return !(*this == rhs); } |
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121 |
#endif |
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122 |
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123 |
private: |
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UIntType wordmask; // avoid "left shift count >= width of type" warnings |
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UIntType value; |
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}; |
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127 |
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#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION |
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// A definition is required even for integral static constants |
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template<class UIntType, int w, int k, int q, int s, UIntType val> |
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const bool linear_feedback_shift<UIntType, w, k, q, s, val>::has_fixed_range; |
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template<class UIntType, int w, int k, int q, int s, UIntType val> |
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const int linear_feedback_shift<UIntType, w, k, q, s, val>::word_size; |
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template<class UIntType, int w, int k, int q, int s, UIntType val> |
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const int linear_feedback_shift<UIntType, w, k, q, s, val>::exponent1; |
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template<class UIntType, int w, int k, int q, int s, UIntType val> |
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const int linear_feedback_shift<UIntType, w, k, q, s, val>::exponent2; |
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template<class UIntType, int w, int k, int q, int s, UIntType val> |
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const int linear_feedback_shift<UIntType, w, k, q, s, val>::step_size; |
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#endif |
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141 |
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} // namespace random |
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} // namespace boost |
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#endif // BOOST_RANDOM_LINEAR_FEEDBACK_SHIFT_HPP |