modules/up/src/gnug++/AllocRing.h
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FUNCTIONS
This source file includes following functions.
- AllocRing
1 // This may look like C code, but it is really -*- C++ -*-
2 /*
3 Copyright (C) 1989 Free Software Foundation
4 written by Doug Lea (dl@rocky.oswego.edu)
5
6 This file is part of the GNU C++ Library. This library is free
7 software; you can redistribute it and/or modify it under the terms of
8 the GNU Library General Public License as published by the Free
9 Software Foundation; either version 2 of the License, or (at your
10 option) any later version. This library is distributed in the hope
11 that it will be useful, but WITHOUT ANY WARRANTY; without even the
12 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
13 PURPOSE. See the GNU Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with this library; if not, write to the Free Software
16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19
20 #ifndef _AllocRing_h
21 #ifdef __GNUG__
22 #pragma interface
23 #endif
24 #define _AllocRing_h 1
25
26
27 /*
28 An AllocRing holds the last n malloc'ed strings, reallocating/reusing
29 one only when the queue wraps around. It thus guarantees that the
30 last n allocations are intact. It is useful for things like I/O
31 formatting where reasonable restrictions may be made about the
32 number of allowable live allocations before auto-deletion.
33 */
34
35 class AllocRing
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36 {
37
38 struct AllocQNode
39 {
40 void* ptr;
41 int sz;
42 };
43
44 AllocQNode* nodes;
45 int n;
46 int current;
47
48 int find(void* p);
49
50 public:
51
52 AllocRing(int max);
53 ~AllocRing();
54
55 void* alloc(int size);
56 int contains(void* ptr);
57 void clear();
58 void free(void* p);
59 };
60
61
62 #endif