MirOS Manual: base(3p)


base(3p)        Perl Programmers Reference Guide         base(3p)

NAME

     base - Establish IS-A relationship with base classes at com-
     pile time

SYNOPSIS

         package Baz;
         use base qw(Foo Bar);

DESCRIPTION

     Allows you to both load one or more modules, while setting
     up inheritance from those modules at the same time.  Roughly
     similar in effect to

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

     If any of the listed modules are not loaded yet, base
     silently attempts to "require" them (and silently continues
     if the "require" failed).  Whether to "require" a base class
     module is determined by the absence of a global variable
     $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".

     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.

DIAGNOSTICS

     Base class package "%s" is empty.
         base.pm was unable to require the base package, because
         it was not found in your path.

HISTORY

     This module was introduced with Perl 5.004_04.

CAVEATS

     Due to the limitations of the implementation, you must use
     base before you declare any of your own fields.

SEE ALSO

     fields

perl v5.8.8                2005-02-05                           1

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