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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | =head1 NAME
base - Establish an ISA relationship with base classes at compile time
=head1 SYNOPSIS
package Baz;
use base qw(Foo Bar);
=head1 DESCRIPTION
Unless you are using the C<fields> pragma, consider this module discouraged
in favor of the lighter-weight C<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);
}
When C<base> tries to C<require> a 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, C<base> will die. This is
useful for inheriting from classes in the same file as yourself but where
the filename does not match the base module name, like so:
# in Bar.pm
package Foo;
sub exclaim { "I can have such a thing?!" }
package Bar;
use base "Foo";
There is no F<Foo.pm>, but because C<Foo> defines a symbol (the C<exclaim>
subroutine), C<base> will not die when the C<require> fails to load F<Foo.pm>.
C<base> will also initialize the fields if one of the base classes has it.
Multiple inheritance of fields is B<NOT> supported, if two or more base classes
each have inheritable fields the 'base' pragma will croak. See L<fields>
for a description of this feature.
The base class' C<import> method is B<not> called.
=head1 DIAGNOSTICS
=over 4
=item Base class package "%s" is empty.
base.pm was unable to require the base package, because it was not
found in your path.
=item Class 'Foo' tried to inherit from itself
Attempting to inherit from yourself generates a warning.
package Foo;
use base 'Foo';
=back
=head1 HISTORY
This module was introduced with Perl 5.004_04.
=head1 CAVEATS
Due to the limitations of the implementation, you must use
base I<before> you declare any of your own fields.
=head1 SEE ALSO
L<fields>
=cut
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