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
|
/*
* 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>
*
* 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.
*/
#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; }
~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; }
private:
T *p;
};
#endif /* } */
|
