modules/up/src/gnug++/AllocRing.h

/* [<][>]
[^][v][top][bottom][index][help] */

FUNCTIONS

This source file includes following functions.
  1. 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
     /* [<][>][^][v][top][bottom][index][help] */
  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

/* [<][>][^][v][top][bottom][index][help] */