at:tutorial:objects
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
at:tutorial:objects [2007/06/27 11:25] – jorge | at:tutorial:objects [2007/06/29 10:39] – jorge | ||
---|---|---|---|
Line 6: | Line 6: | ||
and adapting existing objects, like prototypes in the SELF programming language. The definition of such a prototypical object contains a number of fields and methods that represent the object' | and adapting existing objects, like prototypes in the SELF programming language. The definition of such a prototypical object contains a number of fields and methods that represent the object' | ||
+ | The following code illustrates the ex-nihilo creation of an object: | ||
+ | < | ||
+ | > def point := object: { | ||
+ | def x := 0; | ||
+ | def y := 0; | ||
+ | def init(aX,aY) { | ||
+ | x := aX; | ||
+ | y := aY; | ||
+ | }; | ||
+ | def sumOfSquares() { x*x + y*y }; | ||
+ | } | ||
+ | >>< | ||
+ | </ | ||
+ | As all definitions in AmbientTalk, | ||
+ | |||
+ | <note important> | ||
+ | AmbientTalk not only supports traditional canonical syntax (e.g. '' | ||
+ | </ | ||
+ | |||
+ | In the example above, the state of the '' | ||
===== Sending messages ===== | ===== Sending messages ===== | ||
- | In AmbientTalk, | + | In AmbientTalk, |
+ | |||
+ | < | ||
+ | > point.x | ||
+ | >>2 | ||
+ | > point.sumOfSquares() | ||
+ | >> | ||
+ | </ | ||
+ | |||
+ | This code shows two messages sent to the '' | ||
===== Cloning and instantiation ===== | ===== Cloning and instantiation ===== | ||
+ | As said before in this section, AmbientTalk objects are created [[objects# | ||
+ | < | ||
+ | > def anotherPoint := point.new(2, | ||
+ | >>< | ||
+ | </ | ||
+ | Every object understands the message '' | ||
===== 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. An object can extend to another by using either an **is-a** or a **share-a** relationship, | ||
+ | |||
+ | . While both relationships | ||
+ | |||
+ | | ||
+ | |||
===== Delegation and cloning ===== | ===== Delegation and cloning ===== |
at/tutorial/objects.txt · Last modified: 2013/05/17 20:23 by tvcutsem