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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);
}
C<base> employs some heuristics to determine if a module has already been
loaded, if it has it doesn't try again. If C<base> tries to C<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 C<-1, set by base.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>,
L<public> and L<protected> 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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