1 // @(#)root/meta:$Id$
2 // Author: Philippe Canal 15/03/2005
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_TClassRef
13 #define ROOT_TClassRef
14
15 //////////////////////////////////////////////////////////////////////////
16 // //
17 // TClassRef //
18 // //
19 // Reference to a TClass object and intrusive list of other //
20 // to thise same TClass object references //
21 // //
22 //////////////////////////////////////////////////////////////////////////
23
24 #ifndef ROOT_TClass
25 #include "TClass.h"
26 #endif
27 #ifndef ROOT_TRef
28 #include "TRef.h"
29 #endif
30
31 #include <string>
32
33 class TClassRef {
34
35 private:
36 std::string fClassName; //Name of referenced class
37 #ifdef __CINT__
38 TClass **fClassPtr; //! Ptr to the permanent TClass ptr/reference
39 #else
40 TClass *const*fClassPtr; //! Ptr to the permanent TClass ptr/reference
41 #endif
42
43 friend class TClass;
44
45 void Assign(const TClassRef &);
46 void Assign(TClass *);
47 TClass *InternalGetClass() const;
48 public:
49 TClassRef() : fClassName(), fClassPtr(0) {}
50 TClassRef(TClass *cl);
51 TClassRef(const char *classname);
52 TClassRef(const TClassRef&);
53 inline TClassRef &operator=(const TClassRef &rhs) {
54 // Inline implementation of operator= to speed the no-op case.
55 if (this != &rhs && (fClassPtr == 0 || fClassPtr != rhs.fClassPtr)) {
56 this->Assign(rhs);
57 }
58 return *this;
59 }
60 inline TClassRef &operator=(TClass *rhs) {
61 // Inline implementation of operator= to speed the no-op case.
62 if ( this->fClassPtr==0 || *(this->fClassPtr) != rhs) {
63 this->Assign(rhs);
64 }
65 return *this;
66 }
67
68 ~TClassRef() { };
69
70 void SetName(const char* new_name) {
71 if ( fClassPtr && fClassName != new_name ) Reset();
72 fClassName = new_name;
73 }
74 const char *GetClassName() { return fClassName.c_str(); }
75 TClass *GetClass() const { return (fClassPtr && *fClassPtr) ? *fClassPtr : InternalGetClass(); }
76 void Reset() { fClassPtr = 0; }
77
78 TClass* operator->() const { return (fClassPtr && *fClassPtr) ? *fClassPtr : InternalGetClass(); }
79 operator TClass*() const { return (fClassPtr && *fClassPtr )? *fClassPtr : InternalGetClass(); }
80
81 };
82
83 #endif
84