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NAME

     base - Establish IS-A relationship with base class at
     compile time



SYNOPSIS
         package Baz;
         use base qw(Foo Bar);




DESCRIPTION
     Roughly similar in effect to

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

     Will also initialize the %FIELDS hash if one of the base
     classes has it.  Multiple inheritance of %FIELDS is not
     supported.  The 'base' pragma will croak if multiple base
     classes have a %FIELDS hash.  See the fields manpage for a
     description of this feature.

     When strict 'vars' is in scope base also let 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
     `require's them.  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, defined by base.pm'.



HISTORY
     This module was introduced with Perl 5.004_04.



SEE ALSO
     the fields manpage









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Created 1996-2024 by Maxim Chirkov

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