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
|
/***************************************************************************/
/*
* Portions Copyright (c) 1999 GMRS Software GmbH
* Carl-von-Linde-Str. 38, D-85716 Unterschleissheim, http://www.gmrs.de
* All rights reserved.
*
* Author: Arno Unkrig <arno@unkrig.de>
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes software developed by GMRS Software GmbH."
* The name of GMRS Software GmbH may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*/
/* 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 in the file COPYING for more details.
*/
/***************************************************************************/
/*
* Changes to version 1.2.2 were made by Martin Bayer <mbayer@zedat.fu-berlin.de>
* Dates and reasons of modifications:
* Thu Oct 4 22:44:17 CEST 2001: ported to g++ 3.0
*/
/***************************************************************************/
#ifndef __auto_ptr_h_INCLUDED__ /* { */
#define __auto_ptr_h_INCLUDED__
/* ------------------------------------------------------------------------- */
/*
* Yet another implementation of the "auto_ptr" template... I am not sure
* if the standard does specify "auto_ptr", and how, but this implementation
* uses a scheme *without* an "owns" flag: When the ownership is taken away
* from the "auto_ptr", its pointer *is set to 0*! This may seem odd, but
* in practice, it saves you from problems because such an "auto_ptr" can
* never be dangling, only "0", which is checked in "operator*()" and
* "operator->()". I never found this scheme limiting.
*/
/* ------------------------------------------------------------------------- */
#include <stdlib.h>
template <class T>
class auto_ptr {
public:
// Constructor/copy/destroy
explicit auto_ptr(T *x = 0) : p(x) {}
auto_ptr(const auto_ptr<T> &x) : p(x.p) { ((auto_ptr<T> *) &x)->p = 0; }
void operator=(const auto_ptr<T> &x)
{ delete p; p = x.p; ((auto_ptr<T> *) &x)->p = 0; }
// Would be a nice extension, but is not portable; use "reset()" instead:
//void operator=(T *x); { delete p; p = x; }
~auto_ptr() { delete p; }
// Members
T &operator*() const { if (!p) abort(); return *(T *) p; }
T *operator->() const { if (!p) abort(); return (T *) p; }
T *get() const { return (T *) p; }
T *release() { T *tmp = p; p = 0; return tmp; }
void reset(T *x = 0) { delete p; p = x; }
// These would make a nice extension, but are not provided by many other
// implementations.
//operator const void *() const { return p; }
//int operator!() const { return p == 0; }
private:
T *p;
};
/* ------------------------------------------------------------------------- */
#endif /* } */
/* ------------------------------------------------------------------------- */
|
