1 // @(#)root/cont:$Id$
2 // Author: Rene Brun 28/09/2001
3
4 /*************************************************************************
5 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6 * All rights reserved. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. *
9 * For the list of contributors see $ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11
12 #ifndef ROOT_TRef
13 #define ROOT_TRef
14
15
16 //////////////////////////////////////////////////////////////////////////
17 // //
18 // TRef //
19 // //
20 // Persistent Reference link to a TObject //
21 // //
22 //////////////////////////////////////////////////////////////////////////
23
24
25 #ifndef ROOT_TObject
26 #include "TObject.h"
27 #endif
28
29 class TProcessID;
30 class TFile;
31 class TExec;
32 class TObjArray;
33
34 class TRef : public TObject {
35
36 protected:
37 TProcessID *fPID; //!Pointer to ProcessID when TRef was written
38
39 static TObjArray *fgExecs; //List of execs
40 static TObject *fgObject; //In: this, Out: pointer to object (used by Action on Demand)
41
42 public:
43 //status bits
44 enum { kNotComputed = BIT(12)};
45
46 TRef(): fPID(0) { }
47 TRef(TObject *obj);
48 TRef(const TRef &ref);
49 void operator=(TObject *obj);
50 TRef& operator=(const TRef &ref);
51 virtual ~TRef() { }
52
53 TObject *GetObject() const;
54 TProcessID *GetPID() const {return fPID;}
55 Bool_t IsValid() const {return GetUniqueID()!=0 ? kTRUE : kFALSE;}
56 virtual void SetAction(const char *name);
57 virtual void SetAction(TObject *parent);
58
59 static void SetObject(TObject *obj);
60 static void SetStaticObject(TObject *obj);
61 static Int_t AddExec(const char *name);
62 static TObjArray *GetListOfExecs();
63 static TObject *GetStaticObject();
64
65 friend Bool_t operator==(const TRef &r1, const TRef &r2);
66 friend Bool_t operator!=(const TRef &r1, const TRef &r2);
67
68 ClassDef(TRef,1) //Persistent Reference link to a TObject
69 };
70
71 #endif
72