Understanding Function Attachments to Structs in Zig: Value vs Reference

[tensorush]

I feel like this question keeps getting asked, maybe there should be a doc about it.

Should I pass constants by reference?

In the standard library I always see that structs are passing self like this: self: Self, not like self: *const Self, so Im wondering should I also do that for passing all structs into functions, for example i have a function that takes an immutable struct, should I pass it like value(param: Struct) or like pointer(param: *const Struct)? Also when returning from functions, should I return value or pointer to value. I dont care about lifetimes in this case, just curious in general. Is there any c…