Ambient-Oriented Programming

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at:tutorial:appendix [2021/09/24 10:25] – [Structural Types] elisagat:tutorial:appendix [2024/10/03 22:19] (current) – fixing path to exceptions module elisag
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 ===== Custom Exceptions ===== ===== Custom Exceptions =====
  
-The module ''/.at.exceptions'' defines a number of auxiliary methods which can be used to define one's own custom exceptions. Here is how to define a custom exception ''FooException''. First, define a new type tag with which clients of your code can catch the exception:+The module ''/.at.lang.exceptions'' defines a number of auxiliary methods which can be used to define one's own custom exceptions. Here is how to define a custom exception ''FooException''. First, define a new type tag with which clients of your code can catch the exception:
  
 <code> <code>
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 ===== Language Extensions ===== ===== Language Extensions =====
  
-The files in the ''at/lang'' directory define custom language features which mostly use AmbientTalk/2's reflective facilities to extend the language.+The files in the ''at/lang'' directory define custom language features which mostly use AmbientTalk/2's reflective facilities to extend the language. In what follows, we describe the most relevant ones. 
  
  
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 Please have a look to [[:uf:totam]] for further details on the model and its API. Please have a look to [[:uf:totam]] for further details on the model and its API.
  
-==== Dynamic Variables ====+===== Dynamic Variables =====
  
 The module ''/.at.lang.dynvars'' provides support for defining and using 'Dynamic Variables'. Dynamic variables 'simulate' dynamically scoped variables and are often used to parameterize large parts of code. For example, the 'current output stream'. A dynamic variable has the advantage over a simple global variable that it can only be assigned a value for the extent of a block of code. The module ''/.at.lang.dynvars'' provides support for defining and using 'Dynamic Variables'. Dynamic variables 'simulate' dynamically scoped variables and are often used to parameterize large parts of code. For example, the 'current output stream'. A dynamic variable has the advantage over a simple global variable that it can only be assigned a value for the extent of a block of code.
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 More usage examples of structural types can be found in the unit test defined in the file ''at/lang/structuraltypes.at''. More usage examples of structural types can be found in the unit test defined in the file ''at/lang/structuraltypes.at''.
  
-==== Traits ====+===== Traits =====
  
 The module ''/.at.lang.traits'' exports a small library to use AmbientTalk's traits in a more structured manner. In the literature, traits are described as reusable components with two interfaces: an interface of methods that are //provided// by the trait //to// the composite and an interface of methods that are //required// by the trait //from// the composite. AmbientTalk's traits only make the provided interface explicit. The required interface remains implicit and unchecked at composition time. The module ''/.at.lang.traits'' exports a small library to use AmbientTalk's traits in a more structured manner. In the literature, traits are described as reusable components with two interfaces: an interface of methods that are //provided// by the trait //to// the composite and an interface of methods that are //required// by the trait //from// the composite. AmbientTalk's traits only make the provided interface explicit. The required interface remains implicit and unchecked at composition time.
at/tutorial/appendix.1632471925.txt.gz · Last modified: 2021/09/24 10:25 by elisag