at:tutorial:objects
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at:tutorial:objects [2007/07/02 12:47] – jorge | at:tutorial:objects [2007/07/02 13:29] – jorge | ||
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Every object understands the message '' | Every object understands the message '' | ||
- | AmbientTalk also provides a '' | + | AmbientTalk also provides a '' |
< | < | ||
Line 100: | Line 100: | ||
</ | </ | ||
- | ===== First-class | + | ===== First-class |
+ | AmbientTalk provides an explicit delegation operator '' | ||
+ | < | ||
+ | > def point3D := extend: point with: { | ||
+ | def z := 0; | ||
+ | def init(aX, aY, aZ) { | ||
+ | super^init(aX, | ||
+ | z := aZ; | ||
+ | }; | ||
+ | } | ||
+ | </ | ||
+ | |||
+ | A message sent to an object using this symbol (e.g. to the parent object in the example above) will first look for the method that matches the selector indicated in the message in this object (and its parents) and then execute the method body in the lexical scope of the message sender. | ||
===== Encapsulation ===== | ===== Encapsulation ===== |
at/tutorial/objects.txt · Last modified: 2013/05/17 20:23 by tvcutsem