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/xor_combine.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: xor_combine.hpp,v 1.13 2005/05/21 15:57:00 dgregor Exp $ |
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* |
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*/ |
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#ifndef BOOST_RANDOM_XOR_COMBINE_HPP |
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#define BOOST_RANDOM_XOR_COMBINE_HPP |
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#include <iostream> |
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#include <cassert> |
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#include <algorithm> // for std::min and std::max |
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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/cstdint.hpp> // uint32_t |
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namespace boost { |
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namespace random { |
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template<class URNG1, int s1, class URNG2, int s2, |
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#ifndef BOOST_NO_DEPENDENT_TYPES_IN_TEMPLATE_VALUE_PARAMETERS |
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typename URNG1::result_type |
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#else |
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uint32_t |
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#endif |
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val = 0> |
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class xor_combine |
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{ |
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public: |
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typedef URNG1 base1_type; |
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typedef URNG2 base2_type; |
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typedef typename base1_type::result_type result_type; |
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BOOST_STATIC_CONSTANT(bool, has_fixed_range = false); |
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BOOST_STATIC_CONSTANT(int, shift1 = s1); |
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BOOST_STATIC_CONSTANT(int, shfit2 = s2); |
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xor_combine() : _rng1(), _rng2() |
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{ } |
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xor_combine(const base1_type & rng1, const base2_type & rng2) |
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: _rng1(rng1), _rng2(rng2) { } |
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template<class It> xor_combine(It& first, It last) |
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: _rng1(first, last), _rng2( /* advanced by other call */ first, last) { } |
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void seed() { _rng1.seed(); _rng2.seed(); } |
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template<class It> void seed(It& first, It last) |
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{ |
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_rng1.seed(first, last); |
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_rng2.seed(first, last); |
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} |
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const base1_type& base1() { return _rng1; } |
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const base2_type& base2() { return _rng2; } |
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result_type operator()() |
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{ |
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// MSVC fails BOOST_STATIC_ASSERT with std::numeric_limits at class scope |
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#if !defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) && !(defined(BOOST_MSVC) && BOOST_MSVC <= 1300) |
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BOOST_STATIC_ASSERT(std::numeric_limits<typename base1_type::result_type>::is_integer); |
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BOOST_STATIC_ASSERT(std::numeric_limits<typename base2_type::result_type>::is_integer); |
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BOOST_STATIC_ASSERT(std::numeric_limits<typename base1_type::result_type>::digits >= std::numeric_limits<typename base2_type::result_type>::digits); |
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#endif |
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return (_rng1() << s1) ^ (_rng2() << s2); |
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} |
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return std::min BOOST_PREVENT_MACRO_SUBSTITUTION((_rng1.min)(), (_rng2.min)()); } |
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return std::max BOOST_PREVENT_MACRO_SUBSTITUTION((_rng1.min)(), (_rng2.max)()); } |
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static bool validation(result_type x) { 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, const xor_combine& s) |
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{ |
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os << s._rng1 << " " << s._rng2 << " "; |
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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, xor_combine& s) |
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{ |
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is >> s._rng1 >> std::ws >> s._rng2 >> std::ws; |
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return is; |
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} |
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#endif |
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friend bool operator==(const xor_combine& x, const xor_combine& y) |
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{ return x._rng1 == y._rng1 && x._rng2 == y._rng2; } |
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friend bool operator!=(const xor_combine& x, const xor_combine& y) |
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{ return !(x == y); } |
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102 |
#else |
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// Use a member function; Streamable concept not supported. |
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bool operator==(const xor_combine& rhs) const |
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{ return _rng1 == rhs._rng1 && _rng2 == rhs._rng2; } |
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bool operator!=(const xor_combine& rhs) const |
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{ return !(*this == rhs); } |
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108 |
#endif |
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109 |
|
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110 |
private: |
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base1_type _rng1; |
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base2_type _rng2; |
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}; |
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114 |
|
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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 URNG1, int s1, class URNG2, int s2, |
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#ifndef BOOST_NO_DEPENDENT_TYPES_IN_TEMPLATE_VALUE_PARAMETERS |
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typename URNG1::result_type |
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120 |
#else |
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uint32_t |
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#endif |
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val> |
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const bool xor_combine<URNG1, s1, URNG2, s2, val>::has_fixed_range; |
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#endif |
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126 |
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} // namespace random |
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} // namespace boost |
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129 |
|
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#endif // BOOST_RANDOM_XOR_COMBINE_HPP |