public PairingHeap(IEnumerable <T> items, IComparer <T> comparer, IHeapNodeFactory nodeFactory)
: this(items, ConvertComparer(comparer), nodeFactory)
{
}
public PairingHeap(IEnumerable <T> items, Func <T, T, bool> compareFn, IHeapNodeFactory nodeFactory)
{
_compare = compareFn;
_nodeFactory = nodeFactory;
AddItems(items);
}