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

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## 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
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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

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