I've used the Scrap Your Boilerplate and Uniplate libraries in the Haskell programming language, and I would find that form of generic programming over discriminated unions to be really useful. Is there an equivalent library in the f# programming language?
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Not that I know of; without support built-in to the language/compiler, I expect the only alternative is a reflection-based version. (I don't know how Uniplate is implemented - do you?)
Here's the code for a reflection-based version based on the example from the original presentation. I have not thought deeply about its limitations, but this was much simpler to write than I would have guessed.
The
everywhere
function traverses the entire structure of an arbitrary DU and applies the functionf
to each node that is the type thatf
works on, leaving all other nodes as-is.