From the docs:

use base qw(Foo Bar);

Roughly similar in effect to


    BEGIN {
        require Foo;
        require Bar;
        push @ISA, qw(Foo Bar);
    }

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Will also initialize the fields if one of the base classes has it. Multiple Inheritence of fields is NOT supported, if two or more base classes each have inheritable fields the 'base' pragma will croak. See fields, public and protected for a description of this feature.

When strict 'vars' is in scope, base also lets you assign to @ISA without having to declare @ISA with the 'vars' pragma first.

If any of the base classes are not loaded yet, base silently requires them (but it won't call the import method). Whether to require a base class package is determined by the absence of a global $VERSION in the base package. If $VERSION is not detected even after loading it, base will define $VERSION in the base package, setting it to the string -1, set by base.pm.

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law

In reply to Re: difference between "use base" and @ISA? by CountZero
in thread difference between "use base" and @ISA? by markjugg

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