1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#ifndef __BASE_REFCNT_HH__
32#define __BASE_REFCNT_HH__
33
34class RefCounted
35{
36 private:
37 mutable int count;
38
39 private:
40 // Don't allow a default copy constructor or copy operator on
41 // these objects because the default operation will copy the
42 // reference count as well and we certainly don't want that.
43 RefCounted(const RefCounted &);
44 RefCounted &operator=(const RefCounted &);
45
46 public:
47 RefCounted() : count(0) {}
48 virtual ~RefCounted() {}
49
50 void incref() { ++count; }
51 void decref() { if (--count <= 0) delete this; }
52};
53
54template <class T>
55class RefCountingPtr
56{
57 protected:
58 T *data;
59
60 void copy(T *d)
61 {
62 data = d;
63 if (data)
64 data->incref();
65 }
66 void del()
67 {
68 if (data)
69 data->decref();
70 }
71 void set(T *d)
72 {
73 if (data == d)
74 return;
75
76 del();
77 copy(d);
78 }
79
80
81 public:
82 RefCountingPtr() : data(0) {}
83 RefCountingPtr(T *data) { copy(data); }
84 RefCountingPtr(const RefCountingPtr &r) { copy(r.data); }
85 ~RefCountingPtr() { del(); }
86
87 T *operator->() const { return data; }
88 T &operator*() const { return *data; }
89 T *get() const { return data; }
90
91 const RefCountingPtr &operator=(T *p) { set(p); return *this; }
92 const RefCountingPtr &operator=(const RefCountingPtr &r)
93 { return operator=(r.data); }
94
95 bool operator!() const { return data == 0; }
96 operator bool() const { return data != 0; }
97};
98
99template<class T>
100inline bool operator==(const RefCountingPtr<T> &l, const RefCountingPtr<T> &r)
101{ return l.get() == r.get(); }
102
103template<class T>
104inline bool operator==(const RefCountingPtr<T> &l, const T *r)
105{ return l.get() == r; }
106
107template<class T>
108inline bool operator==(const T *l, const RefCountingPtr<T> &r)
109{ return l == r.get(); }
110
111template<class T>
112inline bool operator!=(const RefCountingPtr<T> &l, const RefCountingPtr<T> &r)
113{ return l.get() != r.get(); }
114
115template<class T>
116inline bool operator!=(const RefCountingPtr<T> &l, const T *r)
117{ return l.get() != r; }
118
119template<class T>
120inline bool operator!=(const T *l, const RefCountingPtr<T> &r)
121{ return l != r.get(); }
122
123#endif // __BASE_REFCNT_HH__