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21 Nov 2015 18:19:20 UTC
- Distribution: base
- Module version: 2.23
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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-weightparent
.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
base
tries torequire
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,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 Foo.pm, but because
Foo
defines a symbol (theexclaim
subroutine),base
will not die when therequire
fails to load Foo.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 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.
package 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
Module Install Instructions
To install base, copy and paste the appropriate command in to your terminal.
cpanm base
perl -MCPAN -e shell install base
For more information on module installation, please visit the detailed CPAN module installation guide.