Iterator for DBIDs.
Important note: this iterator has a
significantly different syntax
and semantics than the Java iterators. It is much more aligned with C than
with Java, but at the same time, the syntax is much more compatible with for
loops.
Usage example:
for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
Object o = relation.get(iter); // Many interfaces allow direct use
DBID id = DBIDUtil.deref(iter); // Materialize only if you need to!
}
We list some fundamental differences.
iter.valid() refers to the current element,
Iterator.next() to the next.iter.advance() does not return an element. Use
get... to access it.DBIDIter.get... do not advance the iterator.
