Iterating Over Strings
The Internationalization Module provides standard iterators that represent a location within an RWUString, and provides access to the code point at that location:
RWUStringIterator provides read-write access to the code points encoded by the code units within an RWUString.RWUConstStringIterator provides read-only access to the code points encoded by the code units within an RWUString.RWUStringIterator instances are returned from non-const RWUString objects. RWUConstStringIterator instances are returned from const RWUString objects, and from instances of classes such as RWUBreakSearch (Chapter 7). These classes return RWUConstStringIterator instances to prevent the RWUString from being changed during processing.
You can construct an RWUConstStringIterator from a given RWUStringIterator, but there is no corresponding conversion from RWUConstStringIterator to RWUStringIterator. This preserves const correctness for the iterator classes.
NOTE: To iterate over the code units in an RWUString, you can use the operator[] interface inherited from RWBasicUString.
