I wonder how to use "cxx" with 3rd C++ interface? about cxx HOT 2 CLOSED

#[cxx::bridge]
mod ffi {
    extern "C" {
        include!("cmyclass.h");

        type CMyClass;

        // plus, optionally, any accessors that Rust needs to access fields
        // of the opaque type CMyClass
    }

    extern "Rust" {
        fn c_my_class_callback(this: &mut CMyClass);
    }
}

fn c_my_class_callback(this: &mut ffi::CMyClass) {
    // the implementation
    println!("it works");
}