1 files changed, 78 insertions, 0 deletions
diff --git a/gnu/lib/libg++/g++-include/PQ.hP b/gnu/lib/libg++/g++-include/PQ.hP
new file mode 100644
index 000000000000..981592ae856b
--- /dev/null
+++ b/gnu/lib/libg++/g++-include/PQ.hP
@@ -0,0 +1,78 @@
+// This may look like C code, but it is really -*- C++ -*-
+/* 
+Copyright (C) 1988 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.
+*/
+
+
+#ifndef _<T>PQ_h
+#ifdef __GNUG__
+#pragma interface
+#endif
+#define _<T>PQ_h 1
+
+#include <Pix.h>
+#include "<T>.defs.h"
+
+class <T>PQ
+{
+protected:
+
+  int                   count;
+
+public:
+                        <T>PQ();
+  virtual              ~<T>PQ();
+
+  int                   length();                // current number of items
+  int                   empty();
+
+  virtual Pix           enq(<T&> item) = 0;      // add item; return Pix
+  virtual <T>           deq();                   // return & remove min
+
+  virtual <T>&          front() = 0;             // access min item
+  virtual void          del_front() = 0;         // delete min item
+
+  virtual int           contains(<T&> item);     // is item in PQ?
+
+  virtual void          clear();                 // delete all items
+
+  virtual Pix           first() = 0;             // Pix of first item or 0
+  virtual void          next(Pix& i) = 0;        // advance to next or 0
+  virtual <T>&          operator () (Pix i) = 0; // access item at i
+  virtual void          del(Pix i) = 0;          // delete item at i
+  virtual int           owns(Pix i);             // is i a valid Pix  ?
+  virtual Pix           seek(<T&> item);         // Pix of item
+
+  void                  error(const char* msg);
+  virtual int           OK() = 0;                // rep invariant
+};
+
+
+inline <T>PQ::<T>PQ() :count(0) {}
+
+inline <T>PQ::~<T>PQ() {}
+
+inline int <T>PQ::length()
+{
+  return count;
+}
+
+inline int <T>PQ::empty()
+{
+  return count == 0;
+}
+
+#endif