author | Pat Downey <patd@symbian.org> |
Tue, 13 Jul 2010 17:51:34 +0100 | |
branch | RCL_3 |
changeset 43 | 97e3c206731f |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* boost random/uniform_01.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_01.hpp,v 1.18 2004/07/27 03:43:32 dgregor Exp $ |
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* |
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* Revision history |
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* 2001-02-18 moved to individual header files |
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*/ |
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#ifndef BOOST_RANDOM_UNIFORM_01_HPP |
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#define BOOST_RANDOM_UNIFORM_01_HPP |
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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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namespace boost { |
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// Because it is so commonly used: uniform distribution on the real [0..1) |
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// range. This allows for specializations to avoid a costly int -> float |
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// conversion plus float multiplication |
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template<class UniformRandomNumberGenerator, class RealType = double> |
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class uniform_01 |
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{ |
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public: |
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typedef UniformRandomNumberGenerator base_type; |
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typedef RealType result_type; |
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BOOST_STATIC_CONSTANT(bool, has_fixed_range = false); |
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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<RealType>::is_integer); |
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#endif |
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explicit uniform_01(base_type rng) |
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: _rng(rng), |
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_factor(result_type(1) / |
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(result_type((_rng.max)()-(_rng.min)()) + |
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result_type(std::numeric_limits<base_result>::is_integer ? 1 : 0))) |
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{ |
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} |
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// compiler-generated copy ctor and copy assignment are fine |
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result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return result_type(0); } |
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result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return result_type(1); } |
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base_type& base() { return _rng; } |
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const base_type& base() const { return _rng; } |
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void reset() { } |
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result_type operator()() { |
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return result_type(_rng() - (_rng.min)()) * _factor; |
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} |
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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_01& u) |
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{ |
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os << u._rng; |
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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, uniform_01& u) |
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{ |
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is >> u._rng; |
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return is; |
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} |
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#endif |
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private: |
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typedef typename base_type::result_type base_result; |
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base_type _rng; |
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result_type _factor; |
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}; |
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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 UniformRandomNumberGenerator, class RealType> |
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const bool uniform_01<UniformRandomNumberGenerator, RealType>::has_fixed_range; |
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#endif |
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} // namespace boost |
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#endif // BOOST_RANDOM_UNIFORM_01_HPP |