Category : OS/2 Files
Archive   : GPPDEV8F.ZIP
Filename : ALLOCRIN.H

// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1989 Free Software Foundation
written by Doug Lea ([email protected])

This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#ifndef _AllocRing_h
#ifdef __GNUG__
#pragma interface
#endif
#define _AllocRing_h 1


/*
An AllocRing holds the last n malloc'ed strings, reallocating/reusing
one only when the queue wraps around. It thus guarantees that the
last n allocations are intact. It is useful for things like I/O
formatting where reasonable restrictions may be made about the
number of allowable live allocations before auto-deletion.
*/

class AllocRing
{

struct AllocQNode
{
void* ptr;
int sz;
};

AllocQNode* nodes;
int n;
int current;

int find(void* p);

public:

AllocRing(int max);
~AllocRing();

void* alloc(int size);
int contains(void* ptr);
void clear();
void free(void* p);
};


#endif