COMP 310 Fall 2012	ListFW Visitors Demo

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The following different types of visitors are available for use  (accumulators not used here):

• CountAlgo -- Returns the count of the number of elements in the list
• SumRevAlgo -- Returns the sum of the elements in a list of integers using reverse accumulation
• SumFwdAlgo -- Returns the sum of the elements in a list of integers using forward accumulation
• CopyAlgo -- Returns a copy of the list
• AddToAlgo -- Returns a copy of the list where the integer parameter is added to all elements

Available accumulators, to be used with the FoldR or FoldL visitor  (above visitors and input parameters not used here).

• SumAcc -- Accumulates the sum of all integer values, starting at zero.
• CopyAcc -- Accumulates a list of all values, in order starting with an empty list, i.e. the first element of the internally stored list is the last value received.
• LastNegAcc  -- Accumulates (saves) the last negative integer value received.   If no negative numbers received the (base case) value is Double.NaN ("Not A Number").

© 2012 by Stephen Wong