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Interface.cpp

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/*

Implement Iterator interface. Add a new function peek() to return the value of next(),

but you can't move the pointer. The constructor is defined, as PeekIterator(Iterator iter)

*/

class PeekIterator<T> {

public:

PeekIterator(Iterator<T> iter) {

it = iter;

data = iter.hasNext()? iter.next():NULL;

}

bool hasNext() {

return data != NULL;

}

T next() {

T current = data;

data = it.hasNext()? it.next():null;

return current;

}

T peek() {

return data;

}

private:

Iterator<T> it;

T data;

}