>From the preamble:
Change Set:        EnumerationAdapting
Date:           10 April 2002
Author:         Richard A. O'Keefe

Introduces the class EnumerationAdapter,
which lets you turn any object with a
#do:-like method into something rather like
a Collection, except that it doesn't support
most of the element-wise operations.
Also includes some minor enhancements
and a bug fix.

>From the class comment:

If you have an object which supports a method like #do:  (perhaps with a
different name), but does not support all the iteration methods you
want, you can wrap an EnumerationAdapter around that object and do the
iteration on it instead.

For example, SequenceableCollection has permutationsDo:
but not permutationsCollect:, so you could do

    (EnumerationAdapter on: aSequence selector: #permutationsDo:)
        collect: [:each | each copy]

For another example, with my Dates-raok change set, both Week and Month
support eachDayDo:, so you can ask

    (EnumerationAdapter on: (Date today month) selector: #eachDayDo:)
        select: [:date| date weekday = 'Sunday']

to find which days of the current month are Sundays.  Admittedly the
right way to handle that would be to make a DateInterval subclass of
SequenceableCollection, but still...

More generally, Stream supports #do:, so (EnumerationAdapater on:
aStream) gives you a "single-shot" enumeration.  To iterate again over
the same stream, you will have to send #reset to it (assuming it is some
kind of positionable stream).  Suppose you want to count the number of
lines in some character stream.  You could do

    (EnumerationAdapter on: aStream) occurrencesOf: Character cr

begin 644 EnumerationAdapting.2.cs
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