fn mul(self: *Self, comptime k: usize, input: Matrix(T, m, k)) Matrix(T, n, k) {
input.print() <-- expected type '*math.Matrix(f32,2,4)', found '*const math.Matrix(f32,2,4)'
how do i make the struct argument non-const?
#how to pass struct as argument
fair igloo
upbeat yew
You can pass the structure by reference:
fn mul(self: *Self, comptime k: usize, input: *Matrix(T, m, k)) ...
peak ether
Function parameters are immutable because they may be a copy of the caller's value
So it is probably a bug to try to mutate it
upbeat yew
In Zig, it's idiomatic to pass immutable structs by value, even when you might pass them by const pointer in C (this is optimized out by the compiler, called copy elision). However, if you need to pass them mutably, you have to provide a reference which you dereference and assign to.
peak ether
In Zig, it's idiomatic to pass immutable structs by value, even when you might p...
I would like this to be the case honestly - but it's not last I knew.
If it matters, use *const Matrix(T, m, k).
It's just an optimization that Zig can make, but there's no guarentee that it will.
As with any optimization, you shouldn't rely on it.
upbeat yew
As with any optimization, you shouldn't rely on it.
Yeah, true. That's a good point.