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18 lines
864 B
Text
18 lines
864 B
Text
perl-Class-ISA
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Suppose you have a class (like Food::Fish::Fishstick) that is derived,
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via its @ISA, from one or more superclasses (as Food::Fish::Fishstick
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is from Food::Fish, Life::Fungus, and Chemicals), and some of those
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superclasses may themselves each be derived, via its @ISA, from one
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or more superclasses (as above).
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When, then, you call a method in that class ($fishstick->calories),
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Perl first searches there for that method, but if it's not there, it
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goes searching in its superclasses, and so on, in a depth-first (or
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maybe "height-first" is the word) search. In the above example, it'd
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first look in Food::Fish, then Food, then Matter, then Life::Fungus,
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then Life, then Chemicals.
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This library, Class::ISA, provides functions that return that list
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-- the list (in order) of names of classes Perl would search to find
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a method, with no duplicates.
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