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SuSE 11.3 - man page for base (suse section 3pm)

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

NAME
       base - Establish an ISA relationship with base classes at compile time

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

DESCRIPTION
       Unless you are using the "fields" pragma, consider this module discouraged in favor of the
       lighter-weight "parent".

       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);
	   }

       "base" employs some heuristics to determine if a module has already been loaded, if it has
       it doesn't try again. If "base" tries to "require" the module it will not die if it cannot
       find the module's file, but will die on any other error. After all this, should your base
       class be empty, containing no symbols, it will die. This is useful for inheriting from
       classes in the same file as yourself, like so:

	       package Foo;
	       sub exclaim { "I can have such a thing?!" }

	       package Bar;
	       use base "Foo";

       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".

       "base" will also initialize the fields if one of the base classes has it.  Multiple
       inheritance 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.

       The base class' "import" method is not called.

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

       Class 'Foo' tried to inherit from itself
	   Attempting to inherit from yourself generates a warning.

	       use Foo;
	       use base 'Foo';

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 v5.12.1				    2010-04-26					base(3pm)


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