Call an object method: Difference between revisions
→{{header|Factor}}: change a class to a regular tuple; makes for a better example
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In Factor, there is no distinction between instance and static methods. Methods are contained in generic words and specialize on a class. Generic words define a <i>method combination</i> so methods know which object(s) to dispatch on. (But most methods dispatch on the object at the top of the data stack.) Under this object model, calling a method is no different than calling any other word.
<lang factor>
IN: rosetta-code.call-a-method
! Define some classes.
SINGLETON: dog
TUPLE: cat sassiness ;
! Define a constructor for cat.
C: <cat> cat
! Define a generic word that dispatches on the object at the top
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! Define methods in speak which specialize on various classes.
M: dog speak drop "Woof!" print ;
M: cat speak
M: object speak drop "I don't know how to speak!" print ;
! Place
${ dog 0.75 <cat> 0.1 <cat> 10 }
! Call speak, a method, just like any other word.
[ speak ]
{{out}}
<pre>
Woof!
Hiss!
Meow!
I don't know how to speak!
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