## Class Graph-Container-Directed-Edge

A graph-container-directed-edge is both a directed-edge-mixin and a graph-container-edge.

### Slot

color | The `color` is used by some algorithms for bookkeeping. [?? Should probably be in a mixin] Initargs::color; Accessors:color. |
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edge-id | The `edge-id` is used internally by CL-Graph for bookkeeping. Initform:0, Initargs::edge-id; Accessors:edge-id. |
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element | Initargs::element,:value; Accessors:element, value. |
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graph | The `graph` of which this edge is a part. Initargs::graph; Reader:graph. |
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tag | The `tag` is used by some algorithms for bookkeeping. [?? Should probably be in a mixin] Initargs::tag; Accessors:tag. |
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vertex-1 | `Vertex-1` is one of the two vertexes that an edge connects. In a directed-edge, `vertex-1` is also the `source-edge`. Initargs::vertex-1; Reader:vertex-1. |
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vertex-2 | `Vertex-2` is one of the two vertexes that an edge connects. In a directed edge, `vertex-2` is also the `target-vertex`. Initargs::vertex-2; Reader:vertex-2. |
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### Other Method

add-edge | Add-edge adds an existing edge to a graph. As add-edge-between-vertexes is generally more natur... |
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add-edge-to-vertex | Attaches the edge `edge` to the vertex `vertex` . |
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delete-edge | Delete the `edge' from the ` graph' and returns it. |
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dfs-back-edge-p | |
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dfs-cross-edge-p | |
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dfs-edge-type | |
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dfs-forward-edge-p | |
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dfs-tree-edge-p | |
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directed-edge-p | Returns true if-and-only-if edge is directed |
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edge->dot | Used by graph->dot to output edge formatting for `edge` onto the `stream` . The function can ass... |
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edge-lessp-by-direction | Returns true if and only if edge-1 is undirected and edge-2 is directed. |
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edge-lessp-by-weight | Returns true if the weight of edge-1 is strictly less than the weight of edge-2. |
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find-edge | Search `graph` for an edge whose vertexes match `edge` . This means that `vertex-1` of the edge ... |
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find-vertex | Search 'graph' for a vertex with element 'value'. The search is fast but inflexible because it ... |
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find-vertex-if | Returns the first vertex in `thing` for which the `predicate` function returns non-nil. If the ... |
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iterate-vertexes | Calls `fn` on each of the vertexes of `thing` . |
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other-vertex | Assuming that the value-or-vertex corresponds to one of the vertexes for `edge` , this method re... |
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out-edge-for-vertex-p | Returns true if the edge is connected to vertex and is either an undirected edge or a directed ... |
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source-vertex | Returns the source-vertex of a directed edge. Compare with `vertex-1` . |
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tagged-edge-p | Returns true if-and-only-if edge's tag slot is t |
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target-vertex | Returns the target-vertex of a directed edge. Compare with `vertex-2` . |
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undirected-edge-p | Returns true if-and-only-if edge is undirected |
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untagged-edge-p | Returns true if-and-only-if edge's tage slot is nil |
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vertexes | Returns a list of the vertexes of `thing` . |
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weight | Returns the weight of an edge. This defaults to 1.0 and can only be altered if the edge is a sub-... |
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