Dtype_dispatch: a macro that defines macros that define enums and match them

graphallthethings.com

17 pointsmwlon3 comments

this is an obvious case of battling the type system that just gets in the way. The "before" version obviously sucks, but the "after" with magic sprinkled in - sucks even more! is there an alternative solution?

I dont understand what's going on but it looks like a hack to avoid code duplication. We should be OK with duplication sometimes because it's more explicit and straightforward to mingle and debug.

>In Pcodec I now have 9 data types and 47 matches

So 9 * 47 - 47 = 376 lines the author got rid of ? Which would imply that if he adds a tenth datatype, he doesn't have to update 47 match blocks sprinkled over the whole code base ?

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