Changing a function from single linked to double linked

[allenowen]

I need to make a double-linked list. I have code for a single-linked linked list.

example code(single-linked):

void Network::push_front(int e, string i, string os, int s) {
	NetworkNode *newone = new NetworkNode(e,i,os,s,start);
	start = newone;
	return;

Network is the "List", NetworkNode is the "Node".

I have a *next and *previous to point to the next node and previous node. I also have a start and end pointer pointing to the beginning and end of the list.
This function is to add nodes containing 4 types of data. How do I update both the next and pointer as I add nodes to the list?