//collect3.cpp
//methods for class Collection implemented using private inheritance

#include "collect3.h"


//constructor
Collection::Collection():List() {}

//returns number of elements in the Collection
int Collection::size() {
	int count = 0;
	Node *p = firstnode();

	while(p) {
		count++;
		p = p->getnext();
	}

	return count;
}

//returns true if element belongs to the Collection, otherwise returns false
int Collection::includes(Type elt) {
	return find(elt);
}

//adds an element to the Collection
void Collection::add(Type elt) {
	if (includes(elt))
		return;
	insertfront(elt);
}

//returns true if Collection is empty, otherwise returns false
int Collection::isempty() {
	return List::isempty();
}