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RooConstVar.h
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1 /*****************************************************************************
2  * Project: RooFit *
3  * Package: RooFitCore *
4  * File: $Id: RooConstVar.h,v 1.9 2007/05/11 09:11:30 verkerke Exp $
5  * Authors: *
6  * WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu *
7  * DK, David Kirkby, UC Irvine, dkirkby@uci.edu *
8  * *
9  * Copyright (c) 2000-2005, Regents of the University of California *
10  * and Stanford University. All rights reserved. *
11  * *
12  * Redistribution and use in source and binary forms, *
13  * with or without modification, are permitted according to the terms *
14  * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
15  *****************************************************************************/
16 #ifndef ROO_CONST_VAR
17 #define ROO_CONST_VAR
18 
19 #include "RooAbsReal.h"
20 #include "RooArgList.h"
21 #include "RooListProxy.h"
22 
23 class RooArgSet ;
24 
25 class RooConstVar final : public RooAbsReal {
26 public:
27  // Constructors, assignment etc
29  RooConstVar(const char *name, const char *title, Double_t value);
30  RooConstVar(const RooConstVar& other, const char* name=0);
31  virtual TObject* clone(const char* newname) const { return new RooConstVar(*this,newname); }
32  virtual ~RooConstVar();
33 
34  ////////////////////////////////////////////////////////////////////////////////
35  /// Return (constant) value.
36  virtual Double_t getValV(const RooArgSet*) const {
37  return _value;
38  }
39 
40  void writeToStream(std::ostream& os, Bool_t compact) const ;
41 
42  virtual Bool_t isDerived() const {
43  // Does value or shape of this arg depend on any other arg?
44  return kFALSE ;
45  }
46 
47 protected:
48 
49  Double_t evaluate() const {
50  return _value;
51  }
52 
53  Double_t _value{0.}; // Constant value of self
54 
55  ClassDef(RooConstVar,1) // Constant RooAbsReal value object
56 };
57 
58 #endif
virtual Double_t getValV(const RooArgSet *) const
Return (constant) value.
Definition: RooConstVar.h:36
RooArgSet is a container object that can hold multiple RooAbsArg objects.
Definition: RooArgSet.h:28
virtual TObject * clone(const char *newname) const
Definition: RooConstVar.h:31
#define ClassDef(name, id)
Definition: Rtypes.h:322
RooConstVar represent a constant real-valued object.
Definition: RooConstVar.h:25
Double_t evaluate() const
Evaluate this PDF / function / constant. Needs to be overridden by all derived classes.
Definition: RooConstVar.h:49
virtual ~RooConstVar()
Destructor.
Definition: RooConstVar.cxx:64
virtual Bool_t isDerived() const
Does value or shape of this arg depend on any other arg?
Definition: RooConstVar.h:42
Double_t _value
Definition: RooConstVar.h:53
const Bool_t kFALSE
Definition: RtypesCore.h:90
RooAbsReal is the common abstract base class for objects that represent a real value and implements f...
Definition: RooAbsReal.h:60
Mother of all ROOT objects.
Definition: TObject.h:37
char name[80]
Definition: TGX11.cxx:109
void writeToStream(std::ostream &os, Bool_t compact) const
Write object contents to stream.
Definition: RooConstVar.cxx:72