command-edge

const Boolean command_edge_equals           (const Object edge_1,
                                             const Object edge_2);

void        command_edge_free               (const Command_Edge edge);

Command_Edge command_edge_create            (const Command_Vertex next_vertex,
                                             const Command_Edge_Data edge_data);

void        command_edge_set_edge_data      (const Command_Edge edge,
                                             const Command_Edge_Data edge_data);

const Command_Edge_Data command_edge_get_edge_data
                                            (const Command_Edge edge);

const Command_Vertex command_edge_get_next_vertex
                                            (const Command_Edge edge);

void        command_edge_dump_text          (const Command_Edge edge,
                                             FILE *stream);

void        command_edge_dump_binary        (const Command_Edge edge,
                                             FILE *stream);