world->_on_error= reinterpret_cast<test_callback_error_fn*>(world_on_error);
world->collection_startup= reinterpret_cast<test_callback_fn*>(world_container_startup);
world->_on_error= reinterpret_cast<test_callback_error_fn*>(world_on_error);
world->collection_startup= reinterpret_cast<test_callback_fn*>(world_container_startup);