Statetrace: Fix indendation. Set the default hostname to "localhost" instead of my...
[gem5.git] / util / statetrace / refcnt.hh
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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31 #ifndef __REFCNT_HH__
32 #define __REFCNT_HH__
33
34 #include <stddef.h> //For the NULL macro definition
35
36 class RefCounted
37 {
38 private:
39 int count;
40
41 private:
42 RefCounted(const RefCounted &);
43
44 public:
45 RefCounted() : count(0) {}
46 virtual ~RefCounted() {}
47
48 void incref() { ++count; }
49 void decref() { if (--count <= 0) delete this; }
50 };
51
52 template <class T>
53 class RefCountingPtr
54 {
55 protected:
56 T *data;
57
58 void copy(T *d)
59 {
60 data = d;
61 if (data)
62 data->incref();
63 }
64 void del()
65 {
66 if (data)
67 data->decref();
68 }
69 void set(T *d)
70 {
71 if (data == d)
72 return;
73
74 del();
75 copy(d);
76 }
77
78
79 public:
80 RefCountingPtr() : data(NULL) {}
81 RefCountingPtr(T *data) { copy(data); }
82 RefCountingPtr(const RefCountingPtr &r) { copy(r.data); }
83 ~RefCountingPtr() { del(); }
84
85 T *operator->() { return data; }
86 T &operator*() { return *data; }
87 T *get() { return data; }
88
89 const T *operator->() const { return data; }
90 const T &operator*() const { return *data; }
91 const T *get() const { return data; }
92
93 RefCountingPtr &operator=(T *p) { set(p); return *this; }
94 RefCountingPtr &operator=(const RefCountingPtr &r)
95 { return operator=(r.data); }
96
97 bool operator!() const { return data == 0; }
98 operator bool() const { return data != 0; }
99 };
100
101 template<class T>
102 bool operator==(const RefCountingPtr<T> &l, const RefCountingPtr<T> &r)
103 { return l.get() == r.get(); }
104
105 template<class T>
106 bool operator==(const RefCountingPtr<T> &l, const T *r)
107 { return l.get() == r; }
108
109 template<class T>
110 bool operator==(const T &l, const RefCountingPtr<T> &r)
111 { return l == r.get(); }
112
113 template<class T>
114 bool operator!=(const RefCountingPtr<T> &l, const RefCountingPtr<T> &r)
115 { return l.get() != r.get(); }
116
117 template<class T>
118 bool operator!=(const RefCountingPtr<T> &l, const T *r)
119 { return l.get() != r; }
120
121 template<class T>
122 bool operator!=(const T &l, const RefCountingPtr<T> &r)
123 { return l != r.get(); }
124
125 #endif // __REFCNT_HH__