at:tutorial:objects
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| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
| at:tutorial:objects [2007/06/29 10:21] – jorge | at:tutorial:objects [2007/06/29 13:06] – jorge | ||
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| def sumOfSquares() { x*x + y*y }; | def sumOfSquares() { x*x + y*y }; | ||
| } | } | ||
| - | >>< | ||
| </ | </ | ||
| Line 46: | Line 45: | ||
| < | < | ||
| > def anotherPoint := point.new(2, | > def anotherPoint := point.new(2, | ||
| - | >>< | ||
| </ | </ | ||
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| ===== Delegation and Dynamic Inheritance ===== | ===== Delegation and Dynamic Inheritance ===== | ||
| - | AmbientTalk features object inheritance or delegation. By means of delegation, an object can reuse and extend the defintion of another. We distinguish | + | AmbientTalk features object inheritance or delegation. By means of delegation, an object can reuse and extend the defintion of another |
| + | |||
| + | The following code shows how to extend objects with a **IS-A** relationship. | ||
| + | |||
| + | < | ||
| + | > def point3D := extend: point with: { | ||
| + | def z := 0; | ||
| + | def sumofsquares() { | ||
| + | super.sumofsquares() + z*z | ||
| + | } | ||
| + | } | ||
| + | </ | ||
| + | |||
| + | The following code shows how to extend objects with a **SHARE-A** relationship. | ||
| + | |||
| + | < | ||
| + | > def point3D := share: point with: { | ||
| + | def z := 0; | ||
| + | def sumofsquares() { | ||
| + | super.sumofsquares() + z*z | ||
| + | } | ||
| + | } | ||
| + | </ | ||
| + | |||
| + | |||
| + | These relationships defines two different semantics for clonning child objects | ||
| + | |||
| + | |||
| + | in the way | ||
| + | |||
| + | |||
| + | |||
| + | . While both relationships | ||
| + | |||
| + | | ||
at/tutorial/objects.txt · Last modified: 2013/05/17 20:23 by tvcutsem