1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef GOB_HELPER_H
#define GOB_HELPER_H
namespace Gob {
/** A strncpy that forces the final \0. */
inline char *strncpy0(char *dest, const char *src, size_t n) {
strncpy(dest, src, n);
dest[n] = 0;
return dest;
}
/** A strdup that new[]s the buffer. */
inline char *strdupcpy(const char *str) {
if (!str)
return 0;
size_t len = strlen(str) + 1;
char *nstr = new char[len];
memcpy(nstr, str, len);
return nstr;
}
/** A "smart" reference counting templated class. */
template<typename T>
class ReferenceCounter {
public:
class Ptr {
public:
bool operator==(const Ptr &p) const { return _p == p._p; }
bool operator==(const ReferenceCounter *p) const { return _p == p; }
T *operator-> () { return _p; }
T &operator* () { return *_p; }
operator T*() { return _p; }
Ptr(T *p) : _p(p) { ++_p->_references; }
Ptr() : _p(0) { }
~Ptr() {
if (_p && (--_p->_references == 0))
delete _p;
}
Ptr(const Ptr &p) : _p(p._p) { ++_p->_references; }
Ptr &operator= (const Ptr &p) {
++p._p->_references;
if (_p && (--_p->_references == 0))
delete _p;
_p = p._p;
return *this;
}
Ptr *operator= (const Ptr *p) {
if (p)
++p->_p->_references;
if (_p && (--_p->_references == 0))
delete _p;
_p = p ? p->_p : 0;
return this;
}
private:
T *_p;
};
ReferenceCounter() : _references(0) { }
virtual ~ReferenceCounter() {}
private:
unsigned _references;
friend class Ptr;
};
} // End of namespace Gob
#endif // GOB_HELPER_H
|
