Return the nth vertex. */
| 488 | |
| 489 | /** Return the nth vertex. */ |
| 490 | static vertex_descriptor vertex(vertices_size_type n) |
| 491 | { |
| 492 | return vertex_descriptor(n); |
| 493 | } |
| 494 | |
| 495 | /** Iterate through the edges of this graph. */ |
| 496 | std::pair<edge_iterator, edge_iterator> edges() const |