Function safe_app::ffi::mutable_data::entries::seq_mdata_entries_len

#[no_mangle]
pub unsafe extern "C" fn seq_mdata_entries_len(
    app: *const App, 
    entries_h: MDataEntriesHandle, 
    user_data: *mut c_void, 
    o_cb: extern "C" fn(user_data: *mut c_void, result: *const FfiResult, len: usize)
)

Returns the number of entries.