class Sequence::Shifting
a primary sequence (presumably unidirectional) with a secondary sequence as backup. the primary is traversed in the forward direcion only. the secondary holds a copy of data as it comes from the primary sequence. the position can be independantly changed to any location; if before the current position of the primary sequence, the secondary sequence is used instead. all writes go to the secondary sequence.
Public Class Methods
new(seq,data= Sequence::Indexed.new(seq.new_data))
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# File lib/sequence/shifting.rb, line 17 def initialize(seq,data= Sequence::Indexed.new(seq.new_data)) @seq=seq #primary @data = data #secondary @offset=@seq.pos extend @seq.like @seq.on_change_notify self end