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GSLHelper.h
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// -*- C++ -*-
//
// GSLHelper.h is a part of Herwig - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_GSLHelper_H
#define HERWIG_GSLHelper_H
//
// This is the declaration of the GSLHelper class.
//
namespace Herwig {
using namespace ThePEG;
/** \ingroup Utilities This class can be used to inherit data structures
* from, which can then be used by the GSL algorithms that need a
* pointer to a function and don't know about Units. This class defines
* the necessary typedefs and forces you to define the "()" operator. In
* addition it implements the vUnit and aUnit static methods which can
* be overwritten if the corresponding base unit is too far from the
* actual used unit. This removes the numerical problem that arises once
* the base unit is several orders of magnitude away from the used unit.
*/
template <typename V, typename T>
struct GSLHelper
{
public:
/**
* Constructor
*/
GSLHelper() {}
/**
* Destructor
*/
virtual ~GSLHelper() {}
/**
* Typedef for Agrument type
*/
typedef T ArgType;
/**
* Typedef for Value type
*/
typedef V ValType;
/**
* Value type
*/
virtual V vUnit() const {return TypeTraits<V>::baseunit();}
/**
* Agrument type
*/
virtual T aUnit() const {return TypeTraits<T>::baseunit();}
private:
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
GSLHelper & operator=(const GSLHelper &);
};
}
namespace {
template <class T> struct GSLparam {
//The function to find root for
const T & function;
};
}
#endif /* HERWIG_GSLHelper_H */

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