Design Patterns Homework 2

● I want you to implement a parallel program structure to my ArrayStack example from the lecture notes, but the entire thing should be based around a LinkedStack. You may use my start on LinkedStack below.

● (30 points) Write the StackMemento for LinkedStack.

● (30 points) Write factory Methods for creating mementos and for creating iterators on your LinkedStack.

● (40 points) Write StackIterator and operator << for Stack which uses the StackIterator.
class CharLinkedListPair
{
public:
char info;
CharLinkedList next;
CharLinkedListPair( char newInfo, CharLinkedList newNext )
: info( newInfo ), next( newNext )
{
}
};
typedef class CharLinkedListPair * CharLinkedList;
class LinkedStack
{
private:
CharLinkedList head;
public:
LinkedStack()
: head( 0 )
{
}
void push( char c )
{
head = new CharLinkedListPair( c, head );
}
char pop()
{
char c = head-info;
CharLinkedList p = head;
head = head-next;
delete p;
return c;
}
void print( ostream & out )
{
for ( CharLinkedList p = head; p != 0; p = p-next )
out << p-info << ' ';
}
~LinkedStack()
{
CharLinkedList temp;
for ( CharLinkedList p = head; p != 0; )
{
temp = p;
p = p-next;
delete temp;
}
}
};
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