base(3) Perl Programmers Reference Guide base(3)NAMEbase - Establish IS-A relationship with base class at com
pile 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, set by
base.pm".
HISTORY
This module was introduced with Perl 5.004_04.
SEE ALSO
the fields manpage
2001-02-22 perl v5.6.1 base(3)
