1 files changed, 63 insertions, 0 deletions
diff --git a/gnu/lib/libg++/g++-include/AllocRing.h b/gnu/lib/libg++/g++-include/AllocRing.h
new file mode 100644
index 00000000000..6a28b15b011
--- /dev/null
+++ b/gnu/lib/libg++/g++-include/AllocRing.h
@@ -0,0 +1,63 @@
+// This may look like C code, but it is really -*- C++ -*-
+/* 
+Copyright (C) 1989 Free Software Foundation
+    written by Doug Lea (dl@rocky.oswego.edu)
+
+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.
+
+	$Id: AllocRing.h,v 1.1 1995/10/18 08:38:14 deraadt Exp $
+*/
+
+#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