1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/epoc32/include/stdapis/boost/random/inversive_congruential.hpp Tue Mar 16 16:12:26 2010 +0000
1.3 @@ -0,0 +1,127 @@
1.4 +/* boost random/inversive_congruential.hpp header file
1.5 + *
1.6 + * Copyright Jens Maurer 2000-2001
1.7 + * Distributed under the Boost Software License, Version 1.0. (See
1.8 + * accompanying file LICENSE_1_0.txt or copy at
1.9 + * http://www.boost.org/LICENSE_1_0.txt)
1.10 + *
1.11 + * See http://www.boost.org for most recent version including documentation.
1.12 + *
1.13 + * $Id: inversive_congruential.hpp,v 1.11 2005/05/21 15:57:00 dgregor Exp $
1.14 + *
1.15 + * Revision history
1.16 + * 2001-02-18 moved to individual header files
1.17 + */
1.18 +
1.19 +#ifndef BOOST_RANDOM_INVERSIVE_CONGRUENTIAL_HPP
1.20 +#define BOOST_RANDOM_INVERSIVE_CONGRUENTIAL_HPP
1.21 +
1.22 +#include <iostream>
1.23 +#include <cassert>
1.24 +#include <boost/config.hpp>
1.25 +#include <boost/static_assert.hpp>
1.26 +#include <boost/random/detail/const_mod.hpp>
1.27 +
1.28 +namespace boost {
1.29 +namespace random {
1.30 +
1.31 +// Eichenauer and Lehn 1986
1.32 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.33 +class inversive_congruential
1.34 +{
1.35 +public:
1.36 + typedef IntType result_type;
1.37 +#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
1.38 + static const bool has_fixed_range = true;
1.39 + static const result_type min_value = (b == 0 ? 1 : 0);
1.40 + static const result_type max_value = p-1;
1.41 +#else
1.42 + BOOST_STATIC_CONSTANT(bool, has_fixed_range = false);
1.43 +#endif
1.44 + BOOST_STATIC_CONSTANT(result_type, multiplier = a);
1.45 + BOOST_STATIC_CONSTANT(result_type, increment = b);
1.46 + BOOST_STATIC_CONSTANT(result_type, modulus = p);
1.47 +
1.48 + result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return b == 0 ? 1 : 0; }
1.49 + result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return p-1; }
1.50 +
1.51 + explicit inversive_congruential(IntType y0 = 1) : value(y0)
1.52 + {
1.53 + BOOST_STATIC_ASSERT(b >= 0);
1.54 + BOOST_STATIC_ASSERT(p > 1);
1.55 + BOOST_STATIC_ASSERT(a >= 1);
1.56 + if(b == 0)
1.57 + assert(y0 > 0);
1.58 + }
1.59 + template<class It> inversive_congruential(It& first, It last)
1.60 + { seed(first, last); }
1.61 +
1.62 + void seed(IntType y0 = 1) { value = y0; if(b == 0) assert(y0 > 0); }
1.63 + template<class It> void seed(It& first, It last)
1.64 + {
1.65 + if(first == last)
1.66 + throw std::invalid_argument("inversive_congruential::seed");
1.67 + value = *first++;
1.68 + }
1.69 + IntType operator()()
1.70 + {
1.71 + typedef const_mod<IntType, p> do_mod;
1.72 + value = do_mod::mult_add(a, do_mod::invert(value), b);
1.73 + return value;
1.74 + }
1.75 +
1.76 + bool validation(result_type x) const { return val == x; }
1.77 +
1.78 +#ifndef BOOST_NO_OPERATORS_IN_NAMESPACE
1.79 +
1.80 +#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
1.81 + template<class CharT, class Traits>
1.82 + friend std::basic_ostream<CharT,Traits>&
1.83 + operator<<(std::basic_ostream<CharT,Traits>& os, inversive_congruential x)
1.84 + { os << x.value; return os; }
1.85 +
1.86 + template<class CharT, class Traits>
1.87 + friend std::basic_istream<CharT,Traits>&
1.88 + operator>>(std::basic_istream<CharT,Traits>& is, inversive_congruential& x)
1.89 + { is >> x.value; return is; }
1.90 +#endif
1.91 +
1.92 + friend bool operator==(inversive_congruential x, inversive_congruential y)
1.93 + { return x.value == y.value; }
1.94 + friend bool operator!=(inversive_congruential x, inversive_congruential y)
1.95 + { return !(x == y); }
1.96 +#else
1.97 + // Use a member function; Streamable concept not supported.
1.98 + bool operator==(inversive_congruential rhs) const
1.99 + { return value == rhs.value; }
1.100 + bool operator!=(inversive_congruential rhs) const
1.101 + { return !(*this == rhs); }
1.102 +#endif
1.103 +private:
1.104 + IntType value;
1.105 +};
1.106 +
1.107 +#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
1.108 +// A definition is required even for integral static constants
1.109 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.110 +const bool inversive_congruential<IntType, a, b, p, val>::has_fixed_range;
1.111 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.112 +const typename inversive_congruential<IntType, a, b, p, val>::result_type inversive_congruential<IntType, a, b, p, val>::min_value;
1.113 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.114 +const typename inversive_congruential<IntType, a, b, p, val>::result_type inversive_congruential<IntType, a, b, p, val>::max_value;
1.115 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.116 +const typename inversive_congruential<IntType, a, b, p, val>::result_type inversive_congruential<IntType, a, b, p, val>::multiplier;
1.117 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.118 +const typename inversive_congruential<IntType, a, b, p, val>::result_type inversive_congruential<IntType, a, b, p, val>::increment;
1.119 +template<class IntType, IntType a, IntType b, IntType p, IntType val>
1.120 +const typename inversive_congruential<IntType, a, b, p, val>::result_type inversive_congruential<IntType, a, b, p, val>::modulus;
1.121 +#endif
1.122 +
1.123 +} // namespace random
1.124 +
1.125 +typedef random::inversive_congruential<int32_t, 9102, 2147483647-36884165,
1.126 + 2147483647, 0> hellekalek1995;
1.127 +
1.128 +} // namespace boost
1.129 +
1.130 +#endif // BOOST_RANDOM_INVERSIVE_CONGRUENTIAL_HPP