X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=moebius2.git;a=blobdiff_plain;f=mgraph.h;h=7f2ab4397ad747ea54e95901d0f093eb71f42d1a;hp=06c53e214ec1f5cac09a151f827b8caaf7344b77;hb=21a2bd20afe0f4673494f4841a5675ca68cbd2d7;hpb=9d40d45102084fda5c88f05c8c832018765342e1

diff --git a/mgraph.h b/mgraph.h
index 06c53e2..7f2ab43 100644
--- a/mgraph.h
+++ b/mgraph.h
@@ -89,8 +89,11 @@
 #define V6 6
 #define V3 3
 
-#define FOR_VERTEX(v) \
-  for ((v)=0; (v)<N; (v)++)
+#define INNER(v,zero,n, precomp)  \
+  for ((v)=(zero); precomp, (v)<(n); (v)++)
+
+#define FOR_VERTEX(v,loop) \
+  loop ((v), 0, N, NOTHING)
 
 #define FOR_VPEDGE(e) \
   for ((e)=0; (e)<V6; (e)++)
@@ -117,13 +120,13 @@ int edge_reverse(int v1, int e);
 #define FOR_VEDGE(v1,e,v2)			\
   FOR_VEDGE_X(v1,e,v2,NOTHING,NOTHING)
 
-#define FOR_EDGE(v1,e,v2)			\
-  FOR_VERTEX((v1))				\
+#define FOR_EDGE(v1,e,v2, loop)			\
+  FOR_VERTEX((v1), loop)			\
     FOR_VEDGE((v1),(e),(v2))
 
-#define FOR_RIM_VERTEX(vy,vx,v)					\
-  for ((vy)=0; (vy)<Y; (vy)+=Y-1)				\
-    for ((vx)=0; (v)= (vy)<<YSHIFT | (vx), (vx)<X; (vx)++)
+#define FOR_RIM_VERTEX(vy,vx,v, loop)		\
+  for ((vy)=0; (vy)<Y; (vy)+=Y-1)		\
+    loop ((vx), 0, X, (v)= (vy)<<YSHIFT | (vx))
 
 int vertices_span_join_p(int v0, int v1);