I’m learning about meta programming and as practice, I tried to define a macro that would batch define and initialize arrays of a certain type. I got some of the way, but it’s clunky. What would be a better way of writing this macro that would work for the second call, also, without replacing n wi…

If you are using this as a learning platform, it is OK, but I don’t see the reason for using a macro. function zeros_batch(type, args) for arg in args zeros(type, arg...) end end zeros_batch(Float64, [[10, 3], [4]]) You should avoid making the expression using strings (unless ther…

Is there a reason you’re trying to do this with strings? I would strongly recommend taking advantage of Julia’s built in code representation, Expr. Furthermore, you should almost never need to use eval within a macro. I think you would benefit a lot from reading Metaprogramming · The Julia Language …

Thanks @Mason . I did read that and I agree that it’s an excellent introduction, but clearly not enough for me.

Ah, I see, I can try and wrangle up a few more references to send you if you would like! In the meantime, here is how I would write your macro: macro zeros(tp, list...) defs = map(list) do ex @assert ex.head == :tuple name = ex.args[1] size = ex.args[2:end] :($n…

A bit of explanation, list is going to be Tuple of expressions which I expect are of the form :((name, size...)), so I am going to map over that tuple to turn it into the desired form. The function map(f, v) takes a function f and applies it to each element of a container v and returns the result, …

This is really helpful @Mason . Thanks a bunch!

How best to write this macro?

General Usage

Mason October 6, 2020, 12:21am 8

This recent discourse thread has some great resources for learning metaprogramming,

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How best to write this macro?

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