diff -r 666f914201fb -r 2fe1408b6811 epoc32/include/stdapis/boost/random/linear_congruential.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/epoc32/include/stdapis/boost/random/linear_congruential.hpp Tue Mar 16 16:12:26 2010 +0000 @@ -0,0 +1,258 @@ +/* boost random/linear_congruential.hpp header file + * + * Copyright Jens Maurer 2000-2001 + * Distributed under the Boost Software License, Version 1.0. (See + * accompanying file LICENSE_1_0.txt or copy at + * http://www.boost.org/LICENSE_1_0.txt) + * + * See http://www.boost.org for most recent version including documentation. + * + * $Id: linear_congruential.hpp,v 1.22 2005/05/21 15:57:00 dgregor Exp $ + * + * Revision history + * 2001-02-18 moved to individual header files + */ + +#ifndef BOOST_RANDOM_LINEAR_CONGRUENTIAL_HPP +#define BOOST_RANDOM_LINEAR_CONGRUENTIAL_HPP + +#include +#include +#include +#include +#include +#include +#include +#include + +namespace boost { +namespace random { + +// compile-time configurable linear congruential generator +template +class linear_congruential +{ +public: + typedef IntType result_type; +#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION + static const bool has_fixed_range = true; + static const result_type min_value = ( c == 0 ? 1 : 0 ); + static const result_type max_value = m-1; +#else + BOOST_STATIC_CONSTANT(bool, has_fixed_range = false); +#endif + BOOST_STATIC_CONSTANT(IntType, multiplier = a); + BOOST_STATIC_CONSTANT(IntType, increment = c); + BOOST_STATIC_CONSTANT(IntType, modulus = m); + + // MSVC 6 and possibly others crash when encountering complicated integral + // constant expressions. Avoid the check for now. + // BOOST_STATIC_ASSERT(m == 0 || a < m); + // BOOST_STATIC_ASSERT(m == 0 || c < m); + + explicit linear_congruential(IntType x0 = 1) + : _modulus(modulus), _x(_modulus ? (x0 % _modulus) : x0) + { + assert(c || x0); /* if c == 0 and x(0) == 0 then x(n) = 0 for all n */ + // overflow check + // disabled because it gives spurious "divide by zero" gcc warnings + // assert(m == 0 || (a*(m-1)+c) % m == (c < a ? c-a+m : c-a)); + + // MSVC fails BOOST_STATIC_ASSERT with std::numeric_limits at class scope +#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS + BOOST_STATIC_ASSERT(std::numeric_limits::is_integer); +#endif + } + + template + linear_congruential(It& first, It last) { seed(first, last); } + + // compiler-generated copy constructor and assignment operator are fine + void seed(IntType x0 = 1) + { + assert(c || x0); + _x = (_modulus ? (x0 % _modulus) : x0); + } + + template + void seed(It& first, It last) + { + if(first == last) + throw std::invalid_argument("linear_congruential::seed"); + IntType value = *first++; + _x = (_modulus ? (value % _modulus) : value); + } + + result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return c == 0 ? 1 : 0; } + result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return modulus-1; } + + IntType operator()() + { + _x = const_mod::mult_add(a, _x, c); + return _x; + } + + static bool validation(IntType x) { return val == x; } + +#ifdef BOOST_NO_OPERATORS_IN_NAMESPACE + + // Use a member function; Streamable concept not supported. + bool operator==(const linear_congruential& rhs) const + { return _x == rhs._x; } + bool operator!=(const linear_congruential& rhs) const + { return !(*this == rhs); } + +#else + friend bool operator==(const linear_congruential& x, + const linear_congruential& y) + { return x._x == y._x; } + friend bool operator!=(const linear_congruential& x, + const linear_congruential& y) + { return !(x == y); } + +#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) && !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) + template + friend std::basic_ostream& + operator<<(std::basic_ostream& os, + const linear_congruential& lcg) + { + return os << lcg._x; + } + + template + friend std::basic_istream& + operator>>(std::basic_istream& is, + linear_congruential& lcg) + { + return is >> lcg._x; + } + +private: +#endif +#endif + + IntType _modulus; // work-around for gcc "divide by zero" warning in ctor + IntType _x; +}; + +// probably needs the "no native streams" caveat for STLPort +#if !defined(__SGI_STL_PORT) && BOOST_WORKAROUND(__GNUC__, == 2) +template +std::ostream& +operator<<(std::ostream& os, + const linear_congruential& lcg) +{ + return os << lcg._x; +} + +template +std::istream& +operator>>(std::istream& is, + linear_congruential& lcg) +{ + return is >> lcg._x; +} +#elif defined(BOOST_NO_OPERATORS_IN_NAMESPACE) || defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) +template +std::basic_ostream& +operator<<(std::basic_ostream& os, + const linear_congruential& lcg) +{ + return os << lcg._x; +} + +template +std::basic_istream& +operator>>(std::basic_istream& is, + linear_congruential& lcg) +{ + return is >> lcg._x; +} +#endif + +#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION +// A definition is required even for integral static constants +template +const bool linear_congruential::has_fixed_range; +template +const typename linear_congruential::result_type linear_congruential::min_value; +template +const typename linear_congruential::result_type linear_congruential::max_value; +template +const IntType linear_congruential::modulus; +#endif + +} // namespace random + +// validation values from the publications +typedef random::linear_congruential minstd_rand0; +typedef random::linear_congruential minstd_rand; + + +#if !defined(BOOST_NO_INT64_T) && !defined(BOOST_NO_INTEGRAL_INT64_T) +// emulate the lrand48() C library function; requires support for uint64_t +class rand48 +{ +public: + typedef int32_t result_type; +#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION + static const bool has_fixed_range = true; + static const int32_t min_value = 0; + static const int32_t max_value = integer_traits::const_max; +#else + enum { has_fixed_range = false }; +#endif + int32_t min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return 0; } + int32_t max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return std::numeric_limits::max BOOST_PREVENT_MACRO_SUBSTITUTION (); } + + explicit rand48(int32_t x0 = 1) : lcf(cnv(x0)) { } + explicit rand48(uint64_t x0) : lcf(x0) { } + template rand48(It& first, It last) : lcf(first, last) { } + // compiler-generated copy ctor and assignment operator are fine + void seed(int32_t x0 = 1) { lcf.seed(cnv(x0)); } + void seed(uint64_t x0) { lcf.seed(x0); } + template void seed(It& first, It last) { lcf.seed(first,last); } + + int32_t operator()() { return static_cast(lcf() >> 17); } + // by experiment from lrand48() + static bool validation(int32_t x) { return x == 1993516219; } + +#ifndef BOOST_NO_OPERATORS_IN_NAMESPACE + +#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS + template + friend std::basic_ostream& + operator<<(std::basic_ostream& os, const rand48& r) + { os << r.lcf; return os; } + + template + friend std::basic_istream& + operator>>(std::basic_istream& is, rand48& r) + { is >> r.lcf; return is; } +#endif + + friend bool operator==(const rand48& x, const rand48& y) + { return x.lcf == y.lcf; } + friend bool operator!=(const rand48& x, const rand48& y) + { return !(x == y); } +#else + // Use a member function; Streamable concept not supported. + bool operator==(const rand48& rhs) const + { return lcf == rhs.lcf; } + bool operator!=(const rand48& rhs) const + { return !(*this == rhs); } +#endif +private: + random::linear_congruential lcf; + static uint64_t cnv(int32_t x) + { return (static_cast(x) << 16) | 0x330e; } +}; +#endif /* !BOOST_NO_INT64_T && !BOOST_NO_INTEGRAL_INT64_T */ + +} // namespace boost + +#endif // BOOST_RANDOM_LINEAR_CONGRUENTIAL_HPP