public NonEmptyRangeEnumerator(S2CellIndex index) : base(index)
{
}
// Convenience constructor that calls Init().
public ContentsEnumerator(S2CellIndex index)
{
cell_tree_ = index.cell_tree_;
Reset();
}
// Initializes a RangeIterator for the given S2CellIndex. The iterator is
// initially *unpositioned*; you must call a positioning method such as
// Begin() or Seek() before accessing its contents.
public RangeNodeEnumerator(S2CellIndex index)
{
range_nodes_ = index.range_nodes_;
Position = -1;
System.Diagnostics.Debug.Assert(range_nodes_.Any()); // Call Build() first.
}
