getStartRegionIter
Initializes a struct@RegionIter to the first subregion of @region.
If @region is empty, @iter will be initialized to the end iterator.
Parameters
iter
iterator to initialize to the first subregion.
Initializes a struct@RegionIter to the first subregion of @region.
If @region is empty, @iter will be initialized to the end iterator.
iterator to initialize to the first subregion.