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// -*- C++ -*-
// $Id: Power.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
//----------------------Power-----------------------------------------------//
//                                                                          //
//  Class Power                                                             //
//  Joe Boudreau, Petar Maksimovic, Nov. 1999                               //
//                                                                          //
//  Power(x) returns x^n                                                    //
//--------------------------------------------------------------------------//
#ifndef Power_h
#define Power_h 1
#include "CLHEP/GenericFunctions/AbsFunction.hh"
namespace Genfun {

  /**
   * @author
   * @ingroup genfun
   */
  class Power : public AbsFunction  {

    FUNCTION_OBJECT_DEF(Power)
  
      public:

    // Constructor
    Power(double n);
    Power(int n);
    Power(unsigned int n);
  
    // Copy constructor
    Power(const Power &right);
  
    // Destructor
    virtual ~Power();
  
    // Retrieve function value

    virtual double operator ()(double argument) const; 
    virtual double operator ()(const Argument & a) const {return operator() (a[0]);}
  
    // Derivative.  
    Derivative partial (unsigned int) const;

    // Does this function have an analytic derivative?
    virtual bool hasAnalyticDerivative() const {return true;}

  private:

    // It is illegal to assign a fixed constant
    const Power & operator=(const Power &right);

    double _doublePower; // power (as a double)
    int    _intPower;    // power (as an integer)
    bool   _asInteger;   // flag:  object constructed with integer argument

  };
} // namespace Genfun
#endif