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# base

- NAME
- SYNOPSIS
- DESCRIPTION
- HISTORY
- SEE ALSO

## 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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