Ambient-Oriented Programming

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at:tutorial:objects [2007/06/27 12:28] – jorgeat:tutorial:objects [2007/06/27 14:08] – jorge
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 Every object understands the message ''new'', which creates a clone (a shallow copy) of the receiver object and initializes the clone by invoking its ''init'' method with the arguments that were passed to new (''xCoord'' and ''yCoord'' in the example of the ''Point'' object). Hence, the ''init'' method plays the role of “constructor” for AmbientTalk objects. 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#Delegation_and_cloning|Delegation and cloning]]. Every object understands the message ''new'', which creates a clone (a shallow copy) of the receiver object and initializes the clone by invoking its ''init'' method with the arguments that were passed to new (''xCoord'' and ''yCoord'' in the example of the ''Point'' object). Hence, the ''init'' method plays the role of “constructor” for AmbientTalk objects. 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#Delegation_and_cloning|Delegation and cloning]].
  
-Object's fields and methods are accessed and modified as follows:+===== Sending messages ===== 
 +In AmbientTalk, computation is expressed in terms of objects sending messages to one another.  
 + 
 +Object's fields and methods are accessed as follows:
  
 <code> <code>
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 > aPoint.sumOfSquares() > aPoint.sumOfSquares()
 >>13 >>13
-> aPoint.x := 4 
->>4 
-> aPoint.sumOfSquares() 
->>25 
 </code> </code>
  
-===== Sending messages ===== +<note important>
-In AmbientTalk, computation is expressed in terms of object sending messages to one another.  +
- +
 Note that AmbientTalk supports both traditional canonical syntax (e.g. o.m(a,b,c)) as well as keyworded syntax (e.g. o.at: key put: value) for method definitions and message sends. Note that AmbientTalk supports both traditional canonical syntax (e.g. o.m(a,b,c)) as well as keyworded syntax (e.g. o.at: key put: value) for method definitions and message sends.
 +</note>
  
 ===== Cloning and instantiation ===== ===== Cloning and instantiation =====
at/tutorial/objects.txt · Last modified: 2013/05/17 20:23 by tvcutsem