How do i create a pointer to a linked list as a member variable?

[foraswim]

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Hi,
I am as they say a beginner
I need to create a pointer to a linked list as a member variable. I have to tried todo this a number of ways but i dont think i understand the terminology.

i have a LinkedList.cpp file and a LinketList.h and and the main program. I'll post the LinkedLIst.h file

#include <cstdlib>
#include <string>
#include<iostream>
#ifndef MARK_FOO
#define MARK_FOO
#include "node.h"



struct node{ 
			std::string data;
			node* next;

			};
		
class LinkedList
{
typedef std::string value_type;
typedef size_t size_type;

public:

//constructors
	LinkedList();
		
		LinkedList(const LinkedList& obj);
	~LinkedList();
//mutating member functions
	void  Insert_Node_tail( node* tail_ptr, value_type entry);
	void  list_head_remove(node* head_ptr);
//Extractor fuctions

		size_type Node_count(){return many_nodes;}
		node* list_search(node* head_ptr, const value_type target);

		
		
private:
size_type many_nodes;
node* head_ptr;
node* current;
node* tail_ptr;
//specific Member functions
	bool IsList_empty();
//	node* LinkedList::LocateNode(size_type Target);

};
#endif
 

// in my int main() file i have written this to create a pointer to a linked list as a member variable

LinkedList* ptr = NULL;
*ptr =  List;
LinkedList& List;
LinkedList List = new LinkedList();

But i think im just lost.

Thanks for any input :)

[VernonDozier]

Close on the code tags:

#include <cstdlib>
#include <string>
#include<iostream>
#ifndef MARK_FOO
#define MARK_FOO
#include "node.h"



struct node{ 
			std::string data;
			node* next;

			};
		
class LinkedList
{
typedef std::string value_type;
typedef size_t size_type;

public:

//constructors
	LinkedList();
		
		LinkedList(const LinkedList& obj);
	~LinkedList();
//mutating member functions
	void  Insert_Node_tail( node* tail_ptr, value_type entry);
	void  list_head_remove(node* head_ptr);
//Extractor fuctions

		size_type Node_count(){return many_nodes;}
		node* list_search(node* head_ptr, const value_type target);

		
		
private:
size_type many_nodes;
node* head_ptr;
node* current;
node* tail_ptr;
//specific Member functions
	bool IsList_empty();
//	node* LinkedList::LocateNode(size_type Target);

};
#endif

// in my int main() file i have written this to create a pointer to a linked list as a member variable

LinkedList* ptr = NULL;
*ptr =  List;
LinkedList& List;
LinkedList List = new LinkedList();

I need to create a pointer to a linked list as a member variable. I have to tried todo this a number of ways but i dont think i understand the terminology.

Well, then I won't ask you to clarify the terminology. :) Not sure what you mean by "as a member variable". "Member" of what?

I imagine you want this?

LinkedList* List = new LinkedList ();
LinkedList* ptr = List;

Now you have one LinkedList object (created in the first line with "new LinkedList ()"). You've defined List as a pointer to the LinkedList object you created. Then you create a second pointer in line 2 and point it to the same LinkedList object. Both List and ptr are pointers pointing to the same LinkedList object.

If that's not what you're looking for, please elaborate.

[foraswim]

no thats it thanks heaps :)

[VernonDozier]

no thats it thanks heaps :)

You're welcome.