at:tutorial:objects
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at:tutorial:objects [2007/07/10 12:39] – * tvcutsem | at:tutorial:objects [2007/07/10 12:46] – fixed tvcutsem | ||
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In this example, '' | In this example, '' | ||
- | 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 '' | The following code shows how to extend objects with a **SHARES-A** delegation relationship. It uses the '' | ||
Line 141: | Line 141: | ||
===== First-class delegation ===== | ===== First-class delegation ===== | ||
- | AmbientTalk provides | + | AmbientTalk provides |
< | < | ||
- | > def point3D := extend: point with: { | + | def point3D := extend: point with: { |
- | def z := 0; | + | def z := 0; |
- | def init(aX, aY, aZ) { | + | def init(aX, aY, aZ) { |
- | super^init(aX, | + | super^init(aX, |
- | z := aZ; | + | z := aZ; |
- | }; | + | }; |
- | } | + | } |
</ | </ | ||
- | A message sent to an object using the '' | + | A message sent to an object using the '' |
<note warning> | <note warning> |
at/tutorial/objects.txt · Last modified: 2013/05/17 20:23 by tvcutsem