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at:tutorial:objects [2007/06/27 14:26] jorge |
at:tutorial:objects [2013/05/17 20:23] tvcutsem updated |
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- | In this section, we explain how the object-oriented programming paradigm is implemented in AmbientTalk. | ||
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- | ===== Objects, fields and methods ===== | ||
- | In AmbientTalk, | ||
- | classes. Rather, they are either created ex-nihilo or by cloning | ||
- | 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' | ||
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- | The following code illustrates the ex-nihilo creation of an object: | ||
- | |||
- | < | ||
- | > def Point := object: { | ||
- | def x := 0; | ||
- | def y := 0; | ||
- | def init(xCoord, | ||
- | x := xCoord; | ||
- | y := yCoord; | ||
- | }; | ||
- | def sumOfSquares() { x*x + y*y }; | ||
- | } | ||
- | >>< | ||
- | </ | ||
- | |||
- | As all definitions in AmbientTalk, | ||
- | |||
- | < | ||
- | > def aPoint := Point.new(2, | ||
- | >>< | ||
- | </ | ||
- | |||
- | Every object understands the message '' | ||
- | |||
- | <note important> | ||
- | AmbientTalk supports both traditional canonical syntax (e.g. '' | ||
- | </ | ||
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- | AmbientTalk’s object instantiation protocol closely corresponds to class instantiation in class-based languages, except that the new object is a clone of an existing object, rather than an empty object allocated from a class. We further explain the semantics of object cloning in subsection [[objects# | ||
- | |||
- | ===== Sending messages ===== | ||
- | In AmbientTalk, | ||
- | |||
- | access to | ||
- | |||
- | access to the fields and methods of the objects. | ||
- | |||
- | Object' | ||
- | |||
- | < | ||
- | > aPoint.x | ||
- | >>2 | ||
- | > aPoint.sumOfSquares() | ||
- | >>13 | ||
- | </ | ||
- | |||
- | |||
- | |||
- | ===== Cloning and instantiation ===== | ||
- | |||
- | |||
- | |||
- | ===== Delegation and Dynamic Inheritance ===== | ||
- | |||
- | ===== Delegation and cloning ===== | ||
- | |||
- | ===== First-class Delegation ===== | ||
- | |||
- | ===== Encapsulation ===== | ||