Add initial prototype.

3-mid/physics/implement/box2d/source/c/box2d-object-private.h

@@ -0,0 +1,23 @@
+#ifndef C_BOX2D_OBJECT_PRIVATE_H
+#define C_BOX2D_OBJECT_PRIVATE_H
+
+
+#include <box2d/box2d.h>
+
+
+extern "C"
+{
+
+  struct Object
+  {
+    b2FixtureDef     fixtureDef;
+    b2BodyDef        bodyDef;
+    b2Body*          body;
+    b2Vec2           Scale;
+
+    void*            userData;     // This holds the physics Object pointer (not the box2d Object pointer).
+  };
+
+} //extern "C"
+
+#endif