layout.nct

//! Allocation layout validation and observation.

see ./index.nct
see ./storage.nct

construct Layout {
    default func new(size: usize, align: usize): Self! {
        if !valid_alignment(align) {
            return invalid_argument()
        }
        return Layout { size: size, align: align }
    }
}

instance Layout {
    method &self.size(): usize {
        return self.size
    }

    method &self.align(): usize {
        return self.align
    }
}

func valid_alignment(align: usize): bool {
    if align == 0 {
        return false
    }
    if align > 16384 {
        return false
    }

    var remaining = align
    while remaining > 1 {
        if remaining % 2 != 0 {
            return false
        }
        remaining /= 2
    }
    return true
}

func invalid_argument(): error {
    return error.new("std.mem.invalid_argument", "invalid allocation request")
}