Add macro for safe edge comparison

diff --git a/lib/cgraph/cgraph.h b/lib/cgraph/cgraph.h
index ee58898c12be752c437de967404e25ec9fd3d658..c7f5db1459d224cd1d492329131b3ab65173fc64 100644 (file)
--- a/lib/cgraph/cgraph.h
+++ b/lib/cgraph/cgraph.h
@@ -412,6 +412,7 @@ extern agusererrf agseterrf(agusererrf);
 #define agtail(e)              AGTAIL(e)
 #define aghead(e)              AGHEAD(e)
 #define agopp(e)               AGOPP(e)
+#define ageqedge(e,f)          (AGMKOUT(e) == AGMKOUT(f))
 
 #define TAILPORT_ID            "tailport"
 #define HEADPORT_ID            "headport"