Differences

This shows you the differences between two versions of the page.

--- at:tutorial:objects [2007/07/10 12:39] – * tvcutsem
+++ at:tutorial:objects [2007/07/10 12:42] – tvcutsem
@@ Line 101: / Line 101: @@
 In this example, ''Point3D'' delegates any message it does not understand to ''Point''. The ''extend:with:'' construct creates a new object whose ''super'' slot is automatically set to the given parent object. The delegation relationship is **IS-A** because a ''Point3D'' is a kind of 2D ''Point'', and a ''z'' coordinate (conceptually) cannot exist without a corresponding ''x'' and ''y'' coordinate.
-A **SHARES-A** relationship between two objects signifies that an object only delegates to another object purely for reasons of code sharing. The delegation link has no other semantics, and conceptually both parent and child can exist without one another.
+A **SHARES-A** relationship between two objects signifies that an object only delegates to another object purely for reasons of code or state sharing. The delegation link has no other semantics, and conceptually both parent and child can exist without one another.
 The following code shows how to extend objects with a **SHARES-A** delegation relationship. It uses the ''share: with:'' language construct.