pub unsafe extern "C" fn igraph_read_graph_graphdb(
graph: *mut igraph_t,
instream: *mut FILE,
directed: igraph_bool_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_read_graph_graphdb(
graph: *mut igraph_t,
instream: *mut FILE,
directed: igraph_bool_t,
) -> igraph_error_t