X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;ds=sidebyside;f=ccan%2Faga%2Ftest%2Fsimple-graph.h;h=5808993ac2c203364c73b6ffdbbf8f09ebfc95fd;hb=318edb2466a24a2eadcfd05fa83ae29c0e8aae03;hp=b8da3ad999045bc9207b59871a56fae691a13120;hpb=eedf1079f38efb2b8dc4fd3f516cce8ac1272c06;p=ccan

diff --git a/ccan/aga/test/simple-graph.h b/ccan/aga/test/simple-graph.h
index b8da3ad9..5808993a 100644
--- a/ccan/aga/test/simple-graph.h
+++ b/ccan/aga/test/simple-graph.h
@@ -256,4 +256,23 @@ static const struct adjacency_list shortcut2_adjacency[] = {
 	{},
 };
 
+/* Negacycle graph
+ *
+ *  A <---- (-3) ----- C
+ *   \                 ^
+ *    (1)->  B -- (1)-/
+ *
+ * Graph with a negative length cycle, and so lacking well-defined shortest paths.
+ */
+struct negacycle_graph {
+	struct simple_graph sg;
+};
+void negacycle_graph_init(struct negacycle_graph *ng);
+static const struct adjacency_list negacycle_adjacency[] = {
+	{1, {2}},
+	{2, {3}},
+	{3, {1}},
+	{},
+};
+
 #endif /* _TEST_GRAPHS_H */