add macros CAST_V() and CAST_D() to support Eina_List(data)<->vertex number conversion

3 files changed, 16 insertions, 6 deletions

diff --git a/src/lib/Eina_Graph.h b/src/lib/Eina_Graph.h
index 84e4abf..16a1282 100644
--- a/src/lib/Eina_Graph.h
+++ b/src/lib/Eina_Graph.h
@@ -60,4 +60,9 @@ eina_graph_shutdown(void);
 #include <eina_graph.h>
 #include <eina_graph_dfs.h>
 
+/**
+ * To cast Eina_List data into a vertex number.
+ */
+#define CAST_D(_d) ((unsigned int) (uintptr_t) _d)
+
 #endif   /* _EINA_GRAPH_MAIN_H */
diff --git a/src/lib/eina_graph_dfs.c b/src/lib/eina_graph_dfs.c
index 263be74..df272b4 100644
--- a/src/lib/eina_graph_dfs.c
+++ b/src/lib/eina_graph_dfs.c
@@ -41,12 +41,12 @@ _eina_graph_dfs_swalk(_Eina_Graph *_g, _Eina_Graph_DFS *_dfs, unsigned int v)
    unsigned int p, w, n, i;
 
    p = v;
-   stack = eina_list_prepend(stack, (void *) v);
+   stack = eina_list_prepend(stack, CAST_V(v));
 
    while (eina_list_count(stack) > 0)
      {
-        w = (unsigned int) eina_list_data_get(stack);
-        stack = eina_list_remove(stack, (void *) w);
+        w = CAST_D(eina_list_data_get(stack));
+        stack = eina_list_remove(stack, CAST_V(w));
 
         if(_dfs->marked[w]) continue;
         _dfs->marked[w] = EINA_TRUE;
@@ -60,7 +60,7 @@ _eina_graph_dfs_swalk(_Eina_Graph *_g, _Eina_Graph_DFS *_dfs, unsigned int v)
              w =  adjs->data[i];
              if (!_dfs->marked[w])
                {
-                  stack = eina_list_prepend(stack, (void *) w);
+                  stack = eina_list_prepend(stack, CAST_V(w));
                }
           }
      }
@@ -174,10 +174,10 @@ eina_graph_dfs_path_to(Eina_Graph_DFS *dfs, unsigned int v)
 
    while (w != _dfs->s)
      {
-        path = eina_list_prepend(path, (void *) w);
+        path = eina_list_prepend(path, CAST_V(w));
         w = _dfs->edge_to[w];
      }
-   path = eina_list_prepend(path, (void *) _dfs->s);
+   path = eina_list_prepend(path, CAST_V(_dfs->s));
 
    return path;
 }
diff --git a/src/lib/eina_graph_private.h b/src/lib/eina_graph_private.h
index 25a6e73..36cfa09 100644
--- a/src/lib/eina_graph_private.h
+++ b/src/lib/eina_graph_private.h
@@ -90,6 +90,11 @@ eina_graph_adjacents_push(Eina_Graph_Adjacents *adjs, unsigned int v, unsigned i
    return EINA_TRUE;
 }
 
+/*+
+ * To cast a vertex number into Eina_List data.
+ */
+#define CAST_V(_v) ((void *) (uintptr_t) _v)
+
 typedef struct _Eina_Graph
 {
    unsigned int vertices;