http://www.perlmonks.org?node_id=8181

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

How can I make one class extend another one?

Originally posted as a Categorized Question.

  • Comment on How can I make one class extend another one?

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Re: How can I make one class extend another one?
by chromatic (Archbishop) on Apr 20, 2000 at 20:40 UTC
    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 );

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    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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Re: How can I make one class extend another one?
by brother ab (Scribe) on Sep 19, 2000 at 09:20 UTC 
    package Child;
use base qw(Mother Father);

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    base pragma not only includes extended classes in @INC, but 'require's them.

    Additionally, it is integrated with fields pragma (if you like strict data members protection)

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