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Greenspun's Tenth Rule strikes again.

Deep in a large ++ codebase, I just found some polymorphism using std::variant and visitor pattern. There are three visitors: main one returning a result, and a pre- and post-processing visitors returning nothing.

The latter two are basically :before and :after methods from in .

Only thing missing in this picture are :around methods, and the ability to compose the visitors...

en.wikipedia.org/wiki/Greenspu

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