base - Establish an ISA relationship with base classes at compile time
package Baz;use base qw(Foo Bar);Unless you are using thefields 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);}Whenbase 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.pmpackage Foo;sub exclaim { "I can have such a thing?!" }package Bar;use base "Foo";There is noFoo.pm, but becauseFoo defines a symbol (theexclaim subroutine),base will not die when therequire fails to loadFoo.pm.
base will also initialize the fields if one of the base classes has it. Multiple inheritance of fields isNOT supported, if two or more base classes each have inheritable fields the 'base' pragma will croak. Seefields for a description of this feature.
The base class'import method isnot called.
base.pm was unable to require the base package, because it was not found in your path.
Attempting to inherit from yourself generates a warning.
package Foo;use base 'Foo';This module was introduced with Perl 5.004_04.
Due to the limitations of the implementation, you must use basebefore you declare any of your own fields.
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