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Diffstat (limited to 'Bachelor/Prog2/Codebeispiele/6_ch17/fig17_10_11/list.h')
| -rw-r--r-- | Bachelor/Prog2/Codebeispiele/6_ch17/fig17_10_11/list.h | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/Bachelor/Prog2/Codebeispiele/6_ch17/fig17_10_11/list.h b/Bachelor/Prog2/Codebeispiele/6_ch17/fig17_10_11/list.h new file mode 100644 index 0000000..c6d2219 --- /dev/null +++ b/Bachelor/Prog2/Codebeispiele/6_ch17/fig17_10_11/list.h @@ -0,0 +1,216 @@ +// Fig. 15.4: list.h
+// Template List class definition.
+#ifndef LIST_H
+#define LIST_H
+
+#include <iostream>
+
+using std::cout;
+
+#include <new>
+#include "listnode.h" // ListNode class definition
+
+template< class NODETYPE >
+class List {
+
+public:
+ List(); // constructor
+ ~List(); // destructor
+ void insertAtFront( const NODETYPE & );
+ void insertAtBack( const NODETYPE & );
+ bool removeFromFront( NODETYPE & );
+ bool removeFromBack( NODETYPE & );
+ bool isEmpty() const;
+ void print() const;
+
+private:
+ ListNode< NODETYPE > *firstPtr; // pointer to first node
+ ListNode< NODETYPE > *lastPtr; // pointer to last node
+
+ // utility function to allocate new node
+ ListNode< NODETYPE > *getNewNode( const NODETYPE & );
+
+}; // end class List
+
+// default constructor
+template< class NODETYPE >
+List< NODETYPE >::List()
+ : firstPtr( 0 ),
+ lastPtr( 0 )
+{
+ // empty body
+
+} // end List constructor
+
+// destructor
+template< class NODETYPE >
+List< NODETYPE >::~List()
+{
+ if ( !isEmpty() ) { // List is not empty
+ cout << "Destroying nodes ...\n";
+
+ ListNode< NODETYPE > *currentPtr = firstPtr;
+ ListNode< NODETYPE > *tempPtr;
+
+ while ( currentPtr != 0 ) { // delete remaining nodes
+ tempPtr = currentPtr;
+ cout << tempPtr->data << '\n';
+ currentPtr = currentPtr->nextPtr;
+ delete tempPtr;
+
+ } // end while
+
+ } // end if
+
+ cout << "All nodes destroyed\n\n";
+
+} // end ~List destructor
+
+// insert node at front of list
+template< class NODETYPE >
+void List< NODETYPE >::insertAtFront( const NODETYPE &value )
+{
+ ListNode< NODETYPE > *newPtr = getNewNode( value );
+
+ if ( isEmpty() ) // List is empty
+ firstPtr = lastPtr = newPtr;
+
+ else { // List is not empty
+ newPtr->nextPtr = firstPtr;
+ firstPtr = newPtr;
+
+ } // end else
+
+} // end function insertAtFront
+
+// insert node at back of list
+template< class NODETYPE >
+void List< NODETYPE >::insertAtBack( const NODETYPE &value )
+{
+ ListNode< NODETYPE > *newPtr = getNewNode( value );
+
+ if ( isEmpty() ) // List is empty
+ firstPtr = lastPtr = newPtr;
+
+ else { // List is not empty
+ lastPtr->nextPtr = newPtr;
+ lastPtr = newPtr;
+
+ } // end else
+
+} // end function insertAtBack
+
+// delete node from front of list
+template< class NODETYPE >
+bool List< NODETYPE >::removeFromFront( NODETYPE &value )
+{
+ if ( isEmpty() ) // List is empty
+ return false; // delete unsuccessful
+
+ else {
+ ListNode< NODETYPE > *tempPtr = firstPtr;
+
+ if ( firstPtr == lastPtr )
+ firstPtr = lastPtr = 0;
+ else
+ firstPtr = firstPtr->nextPtr;
+
+ value = tempPtr->data; // data being removed
+ delete tempPtr;
+
+ return true; // delete successful
+
+ } // end else
+
+} // end function deleteFromFront
+
+// delete node from back of list
+template< class NODETYPE >
+bool List< NODETYPE >::removeFromBack( NODETYPE &value )
+{
+ if ( isEmpty() )
+ return false; // delete unsuccessful
+
+ else {
+ ListNode< NODETYPE > *tempPtr = lastPtr;
+
+ if ( firstPtr == lastPtr )
+ firstPtr = lastPtr = 0;
+ else {
+ ListNode< NODETYPE > *currentPtr = firstPtr;
+
+ // locate second-to-last element
+ while ( currentPtr->nextPtr != lastPtr )
+ currentPtr = currentPtr->nextPtr;
+
+ lastPtr = currentPtr;
+ currentPtr->nextPtr = 0;
+
+ } // end else
+
+ value = tempPtr->data;
+ delete tempPtr;
+
+ return true; // delete successful
+
+ } // end else
+
+} // end function deleteFromBack
+
+// is List empty?
+template< class NODETYPE >
+bool List< NODETYPE >::isEmpty() const
+{
+ return firstPtr == 0;
+
+} // end function isEmpty
+
+// return pointer to newly allocated node
+template< class NODETYPE >
+ListNode< NODETYPE > *List< NODETYPE >::getNewNode(
+ const NODETYPE &value )
+{
+ return new ListNode< NODETYPE >( value );
+
+} // end function getNewNode
+
+// display contents of List
+template< class NODETYPE >
+void List< NODETYPE >::print() const
+{
+ if ( isEmpty() ) {
+ cout << "The list is empty\n\n";
+ return;
+
+ } // end if
+
+ ListNode< NODETYPE > *currentPtr = firstPtr;
+
+ cout << "The list is: ";
+
+ while ( currentPtr != 0 ) {
+ cout << currentPtr->data << ' ';
+ currentPtr = currentPtr->nextPtr;
+
+ } // end while
+
+ cout << "\n\n";
+
+} // end function print
+
+#endif
+
+/**************************************************************************
+ * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice *
+ * Hall. All Rights Reserved. *
+ * *
+ * DISCLAIMER: The authors and publisher of this book have used their *
+ * best efforts in preparing the book. These efforts include the *
+ * development, research, and testing of the theories and programs *
+ * to determine their effectiveness. The authors and publisher make *
+ * no warranty of any kind, expressed or implied, with regard to these *
+ * programs or to the documentation contained in these books. The authors *
+ * and publisher shall not be liable in any event for incidental or *
+ * consequential damages in connection with, or arising out of, the *
+ * furnishing, performance, or use of these programs. *
+ *************************************************************************/
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