// Interface for the road chunk class - base for Intersection and RoadSegment -
// and for the class RoadChunkList: a linked list of RoadChunks.
// CSE143 Spring '01
// Homework 6

#ifndef _ROAD_CHUNK_LIST_H
#define _ROAD_CHUNK_LIST_H

#include "sim_object.h"
#include "road_chunk.h"


// RoadChunkList: a linked list of RoadChunk objects (i.e. pointers to objects
// of classes derived from RoadChunk).
// The list exposes the SimObject interface, and performs each SimObject
// operation on all RoadChunk objects that it contains. In addition, it cleans
// up dynamic memory by deleting all contained objects upon destruction.

class RoadChunkList : public SimObject {
public:
	// Construct an empty list
	RoadChunkList();

	// Destructor: delete all contained road chunk objects
	virtual ~RoadChunkList();

	// Draw all contained objects.
	virtual void draw(GP142Display& gp);

	// Update all contained objects.
	virtual void tick();

	// Prepend a new road chunk object to the list; the object must have been
	// allocated using "new", and will be deleted when the destructor for this
	// object is called.
	virtual void addRoadChunk(RoadChunk *newChunk);

private:
	// Node: one link in the list.
	struct Node {
		RoadChunk *chunk;
		Node *next;
	};
	Node *head;	// Head of the list
};

#endif