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This is an interesting sort of "reverse" visitor pattern. There is an explicit type check, but it is hidden inside of the factory, and the use of the null object means that no one is the wiser.

cbojar
– cbojar

2015-05-28 00:41:22 +00:00
Commented May 28, 2015 at 0:41
Yes, interesting solution. Unfortunately, the actual method usage logic differs so much that it just won't fit into a no-op scheme... Otherwise I'd considered doing it :)

vines
– vines

2015-05-29 09:29:01 +00:00
Commented May 29, 2015 at 9:29

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