# Package =TWiki::ListIterator Iterator over a list
## new(\\@list) Create a new iterator over the given list. Designed primarily for operations over fully defined lists of object references. The list is not damaged in any way. ## hasNext() -> $boolean Returns false when the iterator is exhausted. my $it = new TWiki::ListIterator(\@list); while ($it->hasNext()) { ... ## next() -> $data Return the next entry in the list. The iterator object can be customised to pre- and post-process entries from the list before returning them. This is done by setting two fields in the iterator object: - `{filter}` can be defined to be a sub that filters each entry. The entry will be ignored (next() will not return it) if the filter returns false. - `{process}` can be defined to be a sub to process each entry before it is returned by next. The value returned from next is the value returned by the process function. For example, my @list = ( 1, 2, 3 ); my $it = new TWiki::ListIterator(\@list); $it->{filter} = sub { return $_[0] != 2 }; $it->{process} = sub { return $_[0] + 1 }; while ($it->hasNext()) { my $x = $it->next(); print "$x, "; } will print 2, 4