distribution.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
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 *  the License. You may obtain a copy of the License at 
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 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
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 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
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 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
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/** @defgroup Distribution
 *
 *  A set of distribution for random numbers
 *
 *  distribution classes:
 *
 *  @arg @ref DistributionUniform
 *  @arg @ref DistributionExponential
 *  @arg @ref DistributionNormal
 *
 *  backwards compatible functions:
 *  
 *  @arg @ref uniform
 *  @arg @ref unitGauss
 *  @arg @ref gauss
 */
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_NUM_DISTRIBUTION_H
#define LASS_GUARDIAN_OF_INCLUSION_NUM_DISTRIBUTION_H
 
#include "num_common.h"
#include "num_traits.h"
 
namespace lass
{
namespace num
{
 
/** @ingroup Distribution
 *  enumeration indicating how a real-number range must be closed.
 */
enum RangeType
{
    rtClosed    = 0x0,  ///< range is closed on both sides: [inf, sup]
    rtRightOpen = 0x1,  ///< range is open to the right: [inf, sup)
    rtLeftOpen  = 0x2,  ///< range is open to the left: (inf, sup]
    rtOpen      = 0x3   ///< range is open to both sides: (inf, sup)
};
 
 
 
/** @ingroup Distribution
 *  a uniform distribution mapper.
 *
 *  template arguments:
 *  @arg @a T result type
 *  @arg @a RandomGenerator type of random number generator, see @ref Random.
 *  @arg @a rangeType value of RangeType declaring if the range must be open or closed.
 */
template <typename T, class RandomGenerator, RangeType rangeType = rtClosed>
class
    [[deprecated("DistributionUniform is deprecated, use std::uniform_real_distribution instead")]]
    DistributionUniform
{
public:
 
    typedef RandomGenerator TGenerator;                     ///< generator type
 
    typedef num::NumTraits<T> TNumTraits;                   ///< numeric traits of value type
    typedef typename util::CallTraits<T>::TValue TValue;    ///< value type
    typedef typename util::CallTraits<T>::TParam TParam;    ///< parameter value type
 
    DistributionUniform();
    DistributionUniform(TGenerator& generator,
        TParam infimum = TNumTraits::zero, TParam supremum = TNumTraits::one);
 
    TValue operator()() const;
 
private:
 
    TGenerator* generator_;
    TValue infimum_;
    TValue supremum_;
    long double scale_;
};
 
template <typename T, typename RandomGenerator>
[[deprecated("distributeUniform is deprecated, use std::uniform_real_distribution instead")]]
T distributeUniform(RandomGenerator& generator, T min = T(0), T max = T(1));
 
 
 
/** @ingroup Distribution
 *  an exponential distribution mapper.
 *
 *  template arguments:
 *  @arg @a T result type
 *  @arg @a RandomGenerator type of random number generator, see @ref Random.
 *
 *  reference: Numerical Recipes in C: The Art of Scientific Computing, section 7.2
 */
template <typename T, class RandomGenerator>
class 
    [[deprecated("DistributionExponential is deprecated, use std::exponential_distribution instead")]]
    DistributionExponential
{
public:
 
    typedef RandomGenerator TGenerator;                     ///< generator type
 
    typedef num::NumTraits<T> TNumTraits;                   ///< numeric traits of value type
    typedef typename util::CallTraits<T>::TValue TValue;    ///< value type
    typedef typename util::CallTraits<T>::TParam TParam;    ///< parameter value type
 
    DistributionExponential();
    DistributionExponential(TGenerator& generator,
        TParam rateOfChange = TNumTraits::one);
 
    TValue operator()() const;
 
private:
 
    TGenerator* generator_;
    TValue rateOfChange_;
};
 
template <typename T, typename RandomGenerator>
[[deprecated("distributeExponential is deprecated, use std::exponential_distribution instead")]]
T distributeExponential(RandomGenerator& generator, T rateOfChange = T(1));
 
 
 
/** @ingroup Distribution
 *  a normal distribution mapper (aka guassian distribution)
 *
 *  template arguments:
 *  @arg @a T result type
 *  @arg @a RandomGenerator type of random number generator, see @ref Random.
 *
 *  reference: Numerical Recipes in C: The Art of Scientific Computing, section 7.2
 */
template <typename T, class RandomGenerator>
class
    [[deprecated("DistributionNormal is deprecated, use std::normal_distribution instead")]]
    DistributionNormal
{
public:
 
    typedef RandomGenerator TGenerator;                     ///< generator type
 
    typedef num::NumTraits<T> TNumTraits;                   ///< numeric traits of value type
    typedef typename util::CallTraits<T>::TValue TValue;    ///< value type
    typedef typename util::CallTraits<T>::TParam TParam;    ///< parameter value type
 
    DistributionNormal();
    DistributionNormal(TGenerator& generator,
        TParam mean = TNumTraits::zero, TParam standardDeviation = TNumTraits::one);
 
    TValue operator()() const;
 
private:
 
    TGenerator* generator_;
    TValue mean_;
    TValue standardDeviation_;
    mutable TValue gset_;
    mutable bool iset_;
};
 
template <typename T, typename RandomGenerator>
[[deprecated("distributeExponential is deprecated, use std::normal_distribution instead")]]
T distributeExponential(RandomGenerator& generator, T mean = T(0), T standardDeviation = T(1));
 
 
 
// backwards compatibility functions
 
template<class T,class RG>
[[deprecated("uniform is deprecated, use std::uniform_real_distribution instead")]] 
T uniform(RG& generator);
 
template<class T,class RG>
[[deprecated("gauss is deprecated, use std::normal_distribution instead")]] 
T unitGauss(RG& generator);
 
template<class T,class RG>
[[deprecated("gauss is deprecated, use std::normal_distribution instead")]]
T gauss(RG& generator, typename util::CallTraits<T>::TParam mean, typename util::CallTraits<T>::TParam stddev);
 
}
 
}
 
#include "distribution.inl"
 
#endif
 
// EOF