stack.h

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// $Id: stack.h 1282 2006-06-09 09:46:49Z alex $
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 */
/*
 * */

#ifndef INC_STACK
#define INC_STACK
// Declaration of the stack and MarkedStack classes

//#include "list.h" - in camtypes.h [AUTOMATICALLY REMOVED]

/********************************************************************************************

>   class Stack

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    8/2/94
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    A general purpose stack for storing ListItems. 
    Errors:     -
    SeeAlso:    -

********************************************************************************************/


class Stack
{
public:
    Stack();                 // Constructor 
    ~Stack();                // Destructor
    void Push(ListItem* Item);   // Pushes item onto the stack
    ListItem* Pop(void);     // Pops item from the top of the stack  
    ListItem* GetTop(void);  // Allows you to peek at the top item on the stack 
    INT32 Size();            // Returns number of items on the stack   
    void DeleteAll();            // Removes all stack items and calls their destructors
    
private:
    List stack;              // The stack  
    
};

/********************************************************************************************

>   class ListItemPtrItem: public ListItem

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    8/2/94
    Purpose:    A ListItem object which is a pointer to a ListItem, used by the MarkedStack 
                class. 
    SeeAlso:    MarkedStack

********************************************************************************************/

 
class ListItemPtrItem: public ListItem
{   
    public:
    ListItem* pListItem; 
};

/********************************************************************************************

>   class MarkedStack: public List 

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    8/2/94

    Purpose:    A marked stack is a special purpose stack/list. Its properties are described: 

                It has Push and Pop methods 
                It inherits from list so it can easily be searched
                
                It has a Mark() method which marks the current top of stack. Mark() can be
                called more than once to insert a number of marks into the stack. 

                It has a Release() method which restores the state of the stack to the 
                position of the last mark. 

                eg. 

                MarkedStack MS(); 

                MS->Push(a)
                MS->Mark()
                MS->Push(b) 
                MS->Push(c)
                MS->Mark()
                MS->Push(d)

                The stack looks like this 
                
                d <- Tail 
                c <- Mark
                b
                a <- Mark

                If we now perform MS->Release() the stack will look like this 

                c
                b
                a  <- Mark

                If we perform MS->Release() a second time, the stack will look like this

                a

                
    SeeAlso:    -

********************************************************************************************/


class MarkedStack: public List 
{
    public:
    MarkedStack();          // constructor
    ~MarkedStack();         // destructor
    
    void Push(ListItem* Item);  // Pushes item onto the stack
    ListItem* Pop(void);    // Pops item from the top of the stack

    BOOL Mark();            // Inserts a mark into the stack 
    void Release();         // pops and deletes items till we reach the first mark
    
    void DeleteAll();       // deletes all elements and marks
    
    private:
    Stack MarkStack;        // A stack of pointers (marks) into the list 

};
#endif

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