docs/04-reference-dot.markdown @ 2e90748b1555

Stop passing NIL as :hash-function during hash table construction

At least in SBCL 2.0.6, passing :hash-function NIL to make-hash-table causes an
UNDEFINED-FUNCTION error. Since it's unlikely that any other CL implementation
will have useful behavior for an explicit NIL argument that's different from not
passing it at all, it's better to not pass :hash-function if it's set to NIL.

# cl-dot Support

cl-digraph includes support for drawing digraphs with Graphviz using `cl-dot`
  in the `cl-digraphs.dot` system.

  [TOC]

## Package `DIGRAPH.DOT`

### `DRAW` (function)

    (DRAW DIGRAPH &KEY (FILENAME digraph.png) (FORMAT :PNG))

Draw `digraph` with cl-dot.