Extracted from Pike v7.8 release 866 at 2016-11-06.
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ADT
ADT.Sequence
ADT.Sequence()->SequenceIterator

Methods
 _equal()
 `!()
 `+()
 `+=()
 `-()
 `<()
 `>()
 create()
 distance()
 get_collection()
 has_next()
 has_previous()
 index()
 set_value()
 value()
previousADT.Sequence()->SequenceIterator()->has_next()
ADT.Sequence()->SequenceIterator()->index()next

Method ADT.Sequence()->SequenceIterator()->has_previous()

Method has_previous

int(0..1) has_previous(void|int steps)

Returns

Returns true if it is possible to move steps steps backwards, if steps weren't supplied it check if it is possible to move one step backward.