Method cb_progress_callback

rust/src/progress.rs:7–14

(
        ctxt: *mut c_void,
        progress: usize,
        total: usize,
    )

    fn progress(&mut self, progress: usize, total: usize) -> bool;

    unsafe extern "C" fn cb_progress_callback(
        ctxt: *mut c_void,
        progress: usize,
        total: usize,
    ) -> bool {
        let ctxt: &mut Self = &mut *(ctxt as *mut Self);
        ctxt.progress(progress, total)
    }

    #[allow(clippy::wrong_self_convention)]
    unsafe fn into_raw(&mut self) -> *mut c_void {