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Answer: How can I make one class extend another one?

by chromatic (Archbishop)
on Apr 20, 2000 at 20:40 UTC ( #8188=categorized answer: print w/replies, xml ) Need Help??

Q&A > object-oriented programming > How can I make one class extend another one? - Answer contributed by chromatic

Inheritance is very easy in Perl. Assuming we have a class PerlMonk, we could create a new class called vroom that extends the first:
package vroom; @ISA = qw ( PerlMonk );
From then on, for any method called on an instance of vroom that isn't defined immediately in the class, Perl will search the classes named in @vroom::ISA for those methods.

That is, PerlMonk::dispense_wisdom() is available via $vroom->dispense_wisdom() even if there is no vroom::dispense_wisdom().

Note that the @ISA array can contain lots of parent classes. Note also that they are searched left-to-right, depth first.

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[choroba]: Interesting Regexp::Debugger issue
[Corion]: Most likely Regexp::Debugger uses something in main:: ;)

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