r#"pub extern "C" fn TestPassInterface_use_interface ( a : * mut :: std :: os :: raw :: c_void , b : i32 , ) -> i32 {
 assert ! ( ! a . is_null ( ) ) ;
 let a : * mut Box < dyn Interface > = a as * mut Box < dyn Interface >;
 let a : Box < Box < dyn Interface > > = unsafe { Box :: from_raw ( a ) } ;
 let mut ret : i32 = use_interface ( a , b ) ;
 ret }"#;

r#"impl SwigForeignClass for Box<Box<dyn Interface>> {
    fn c_class_name() -> *const ::std::os::raw::c_char {
        swig_c_str!(stringify!(Box<Box<dyn Interface>>))
    }
    fn box_object(this: Self) -> *mut ::std::os::raw::c_void {
        let this: *const Box<dyn Interface> = Box::into_raw(this);
        this as *mut ::std::os::raw::c_void
    }
    fn unbox_object(p: *mut ::std::os::raw::c_void) -> Self {
        let p = p as *mut Box<dyn Interface>;
        let p: Box<Box<dyn Interface>> = unsafe { Box::from_raw(p) };
        p
    }
}"#;

r#"pub extern "C" fn Interface_create_interface() -> *const ::std::os::raw::c_void {
    let this: Box<Box<dyn Interface>> = create_interface();
    let this: *const Box<dyn Interface> = Box::into_raw(this);
    this as *const ::std::os::raw::c_void
}"#;

r#"pub extern "C" fn Interface_f(this: *mut Box<dyn Interface>, a0: i32) -> i32 {
    let this: &Box<dyn Interface> = unsafe { this.as_mut().unwrap() };
    let mut this: &dyn Interface = this.as_ref();
    let mut ret: i32 = Interface::f(this, a0);
    ret
}"#;