Comment by steveklabnik
5 years ago
You are not misunderstanding what Zig allows, but Rust can do the same thing. https://doc.rust-lang.org/stable/core/alloc/trait.Allocator.... just isn't stable yet. And it's conventional for it to take this as an argument for everything that needs it in Zig.
BufWrite would do it the same as any data structure would, an additional parameter, all the same.
I actually did misunderstand. I thought it allowed callers to give an allocator and the callees didn't have to know for it to be used.
I mean, I'd say you were mostly right, in the sense that the callee doesn't know the implementation details of the passed allocator; it's only aware of the interface (i.e. the struct of function pointers that defines that interface).