epoc32/include/stdapis/boost/random/uniform_real.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:33:34 +0100
branchSymbian3
changeset 4 837f303aceeb
permissions -rw-r--r--
Current Symbian^3 public API header files (from PDK 3.0.h)
This is the epoc32/include tree with the "platform" subtrees removed, and
all but a selected few mbg and rsg files removed.
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/* boost random/uniform_real.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_real.hpp,v 1.17 2005/01/28 15:04:17 dgregor Exp $
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 *
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 * Revision history
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 *  2001-04-08  added min<max assertion (N. Becker)
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 *  2001-02-18  moved to individual header files
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 */
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#ifndef BOOST_RANDOM_UNIFORM_REAL_HPP
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#define BOOST_RANDOM_UNIFORM_REAL_HPP
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#include <cassert>
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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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// uniform distribution on a real range
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template<class RealType = double>
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class uniform_real
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{
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public:
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  typedef RealType input_type;
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  typedef RealType result_type;
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  explicit uniform_real(RealType min = RealType(0),
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                        RealType max = RealType(1))
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    : _min(min), _max(max)
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  {
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#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
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    BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer);
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#endif
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    assert(min < max);
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  }
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  // compiler-generated copy ctor and assignment operator are fine
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  result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _min; }
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  result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return _max; }
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  void reset() { }
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  template<class Engine>
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  result_type operator()(Engine& eng) {
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    return static_cast<result_type>(eng() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION())
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           / static_cast<result_type>(eng.max BOOST_PREVENT_MACRO_SUBSTITUTION() - eng.min BOOST_PREVENT_MACRO_SUBSTITUTION())
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           * (_max - _min) + _min;
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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_real& ud)
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  {
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    os << ud._min << " " << ud._max;
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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_real& ud)
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  {
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    is >> std::ws >> ud._min >> std::ws >> ud._max;
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    return is;
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  }
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#endif
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private:
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  RealType _min, _max;
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};
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} // namespace boost
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#endif // BOOST_RANDOM_UNIFORM_REAL_HPP