Initializes an iterator for the given S2ShapeIndex. This method may
also be called in order to restore an iterator to a valid state after
the underlying index has been updated (although it is usually easier
just to declare a new iterator whenever required, since iterator
construction is cheap).
Initializes an iterator for the given S2ShapeIndex. This method may also be called in order to restore an iterator to a valid state after the underlying index has been updated (although it is usually easier just to declare a new iterator whenever required, since iterator construction is cheap).