Initial revision

include/Stack.hh

+/*=========================================================================
+
+  Program:   Visualization Library
+  Module:    Stack.hh
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+This file is part of the Visualization Library. No part of this file
+or its contents may be copied, reproduced or altered in any way
+without the express written consent of the authors.
+
+Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen 1993, 1994 
+
+=========================================================================*/
+// .NAME vlStack - create and manipulate lists of objects
+// .SECTION Description
+// vlStack is a general object for creating and manipulating lists
+// of objects. vlStack also serves as a base class for lists of
+// specific types of objects.
+
+#ifndef __vlStack_hh
+#define __vlStack_hh
+
+#include "Object.hh"
+
+class vlStackElement
+{
+ public:
+  vlObject *Item;
+  vlStackElement *Next;
+};
+
+class vlStack : public vlObject
+{
+public:
+  vlStack();
+  ~vlStack();
+  void PrintSelf(ostream& os, vlIndent indent);
+  char *GetClassName() {return "vlStack";};
+
+  void Push(vlObject *);
+  vlObject *Pop();
+  vlObject *GetTop();
+  int  GetNumberOfItems();
+
+protected:
+  int NumberOfItems;
+  vlStackElement *Top;
+  vlStackElement *Bottom;
+};
+
+#endif

src/Stack.cc

+/*=========================================================================
+
+  Program:   Visualization Library
+  Module:    Stack.cc
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+This file is part of the Visualization Library. No part of this file
+or its contents may be copied, reproduced or altered in any way
+without the express written consent of the authors.
+
+Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen 1993, 1994 
+
+=========================================================================*/
+#include "Stack.hh"
+
+// Description:
+// Construct with empty stack.
+vlStack::vlStack()
+{
+  this->NumberOfItems = 0;
+  this->Top = NULL;
+  this->Bottom = NULL;
+}
+
+vlStack::~vlStack()
+{
+  vlStackElement *p;  
+
+  for ( p=this->Top; p != NULL; p = p->Next )
+    {
+    delete p;
+    }
+}
+
+// Description:
+// Add an object to the top of the stack. Does not prevent duplicate entries.
+void vlStack::Push(vlObject *a)
+{
+  vlStackElement *elem;
+
+  elem = new vlStackElement;
+  
+  if ( this->Top == NULL )
+    this->Bottom = elem;
+  else
+    elem->Next = this->Top;
+
+  this->Top = elem;
+  elem->Item = a;
+  this->NumberOfItems++;
+}
+
+// Description:
+// Remove an object from the top of the list.
+vlObject *vlStack::Pop()
+{
+  int i;
+  vlObject *item;
+  vlStackElement *next;
+  
+  if ( this->Top == NULL ) return NULL;
+
+  item = this->Top->Item;
+  next = this->Top->Next;
+  delete this->Top;
+
+  if ( this->Top == this->Bottom )
+    this->Top = this->Bottom = NULL;
+  else
+    this->Top = next;
+
+  this->NumberOfItems--;
+  return item;
+}
+
+// Description:
+// Return the number of objects in the stack.
+vlObject *vlStack::GetTop()
+{
+  if ( this->Top != NULL )
+    return this->Top->Item;
+  else
+    return NULL;
+}
+
+// Description:
+// Return the number of objects in the stack.
+int vlStack::GetNumberOfItems()
+{
+  return this->NumberOfItems;
+}
+
+void vlStack::PrintSelf(ostream& os, vlIndent indent)
+{
+  if (this->ShouldIPrint(vlStack::GetClassName()))
+    {
+    vlObject::PrintSelf(os,indent);
+    
+    os << indent << "Number Of Items: " << this->NumberOfItems << "\n";
+    }
+}
+
+
+
+
+
+
+
+