What are the pros/cons of using black-box reuse over white-box reuse?
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In my experience, White box reuse is normally done through inheritance and black box is done through composition.
White Box Reuse
Pro: You can customize the module to fit the specific situation, this allows reuse in more situations
Con: You now own the customized result, so it adds to your code complexity.
Black Box Reuse
Pro: Simplicity and Cleanliness
Con: Many times it is just not possible
verdict:
I prefer Black Box whenever possible.