Trouble passing struct to C function

[mkitti]

@Octogonapus

In fact, every struct in my wrapper is mutable .

This is a problem. Make them immutable.

If you really need to update them, you could reconstruct the object. Or you could use this:

GitHub - JuliaObjects/Accessors.jl: Update immutable data

JuliaCon 2020 | Changing the immutable | Jan Weidner