As positively recieved on the mailing list and irc (and blessed by

guitargeek), this commit enhances the support for temporary storage
for the structs EditVert, EditEdge, and EditFace. The field
"EditVert *vn" has been removed and replaced by a union called
"tmp" that can hold:

 v,  an EditVert pointer;
 e,  an EditEdge pointer;
 f,  an EditFace pointer;
 fp, a float pointer;
 p,  a void pointer;
 l,  a long;

Please see the mailing list post here for more information about
this:

http://projects.blender.org/pipermail/bf-committers/2005-December/012877.html

1 files changed, 33 insertions, 3 deletions

diff --git a/source/blender/blenlib/BLI_editVert.h b/source/blender/blenlib/BLI_editVert.h
index a11e1ebfeff..315498bab4c 100644
--- a/source/blender/blenlib/BLI_editVert.h
+++ b/source/blender/blenlib/BLI_editVert.h
@@ -43,7 +43,18 @@ struct DerivedMesh;
 /* note; changing this also might affect the undo copy in editmesh.c */
 typedef struct EditVert
 {
-	struct EditVert *next, *prev, *vn;
+	struct EditVert *next, *prev;
+	union {
+		/* some lean storage for temporary usage 
+		 * in editmesh routines
+		 */
+		struct EditVert *v;
+		struct EditEdge *e;
+		struct EditFace *f;
+		float           *fp;
+		void            *p;
+		long             l;
+	} tmp;
 	float no[3];
 	float co[3];
 	short xs, ys;
@@ -66,8 +77,17 @@ typedef struct HashEdge {
 typedef struct EditEdge
 {
 	struct EditEdge *next, *prev;
-	/* Note: vn is for general purpose temporary storage */
-	struct EditVert *v1, *v2, *vn;
+	struct EditVert *v1, *v2;
+	union {
+		/* some lean storage for temporary usage 
+		 * in editmesh routines
+		 */
+		struct EditVert *v;
+		struct EditEdge *e;
+		struct EditFace *f;
+		void            *p;
+		long             l;
+	} tmp;
 	short f1, f2;	/* short, f1 is (ab)used in subdiv */
 	unsigned char f, h, dir, seam;
 	float crease;
@@ -82,6 +102,16 @@ typedef struct EditFace
 	struct EditFace *next, *prev;
 	struct EditVert *v1, *v2, *v3, *v4;
 	struct EditEdge *e1, *e2, *e3, *e4;
+	union {
+		/* some lean storage for temporary usage 
+		 * in editmesh routines
+		 */
+		struct EditVert *v;
+		struct EditEdge *e;
+		struct EditFace *f;
+		void            *p;
+		long             l;
+	} tmp;
 	float n[3], cent[3];
 	struct TFace tf;	/* a copy of original tface. */
 	unsigned char mat_nr, flag;