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CLHEP/GenericFunctions/FunctionComposition.hh
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1 // -*- C++ -*-
2 // $Id: FunctionComposition.hh,v 1.2 2003/09/06 14:04:13 boudreau Exp $
3 //--------------------------FunctionComposition-----------------------------//
4 // //
5 // FunctionComposition, result of composition of two functions. //
6 // Joe Boudreau, Petar Maksimovic, November 1999 //
7 // //
8 //--------------------------------------------------------------------------//
9 
10 #ifndef FunctionComposition_h
11 #define FunctionComposition_h 1
13 
14 namespace Genfun {
15 
21 
23 
24  public:
25 
26  // Constructor
27  FunctionComposition(const AbsFunction *arg1, const AbsFunction *arg2);
28 
29  // Copy constructor
31 
32  // Destructor
33  virtual ~FunctionComposition();
34 
35  // Retreive function value
36  virtual double operator ()(double argument) const;
37  virtual double operator ()(const Argument & a) const;
38 
39  // Dimensionality
40  virtual unsigned int dimensionality() const;
41 
42  // Derivative.
43  Derivative partial (unsigned int) const;
44 
45  // Does this function have an analytic derivative?
46  virtual bool hasAnalyticDerivative() const {return true;}
47 
48  private:
49 
50  // It is illegal to assign a FunctionComposition
51  const FunctionComposition & operator=(const FunctionComposition &right);
52 
53  const AbsFunction *_arg1;
54  const AbsFunction *_arg2;
55  };
56 } // namespace Genfun
57 #endif