class::makemethods::utility::inheritable(3pm) [debian man page]

MakeMethods::Utility::Inheritable(3pm)			User Contributed Perl Documentation		    MakeMethods::Utility::Inheritable(3pm)

NAME

       Class::MakeMethods::Utility::Inheritable - "Inheritable" data

SYNOPSIS

	 package MyClass;
	 sub new { ... }

	 package MySubclass;
	 @ISA = 'MyClass';
	 ...
	 my $obj = MyClass->new(...);
	 my $subobj = MySubclass->new(...);

	 use Class::MakeMethods::Utility::Inheritable qw(get_vvalue set_vvalue );

	 my $dataset = {};
	 set_vvalue($dataset, 'MyClass', 'Foobar');    # Set value for class
	 get_vvalue($dataset, 'MyClass');	       # Gets value "Foobar"

	 get_vvalue($dataset, $obj);		       # Objects "inherit"
	 set_vvalue($dataset, $obj, 'Foible');	       # Until you override
	 get_vvalue($dataset, $obj);		       # Now finds "Foible"

	 get_vvalue($dataset, 'MySubclass');	       # Subclass "inherits"
	 get_vvalue($dataset, $subobj); 	       # As do its objects
	 set_vvalue($dataset, 'MySubclass', 'Foozle'); # Until we override it
	 get_vvalue($dataset, 'MySubclass');	       # Now finds "Foozle"

	 get_vvalue($dataset, $subobj); 	       # Change cascades down
	 set_vvalue($dataset, $subobj, 'Foolish');     # Until we override again

	 get_vvalue($dataset, 'MyClass');	       # Superclass is unchanged

DESCRIPTION

       This module provides several functions which allow you to store values in a hash corresponding to both objects and classes, and to retrieve
       those values by searching a object's inheritance tree until it finds a matching entry.

       This functionality is used by Class::MakeMethods::Standard::Inheritable and Class::MakeMethods::Composite::Inheritable to construct methods
       that can both store class data and be overriden on a per-object level.

REFERENCE

   find_vself
	 $vself = find_vself( $dataset, $instance );

       Searches $instance's inheritance tree until it finds a matching entry in the dataset, and returns either the instance, the class that
       matched, or undef.

   get_vvalue
	 $value = get_vvalue( $dataset, $instance );

       Searches $instance's inheritance tree until it finds a matching entry in the dataset, and returns that value

   set_vvalue
	 $value = set_vvalue( $dataset, $instance, $value );

       Searches $instance's inheritance tree until it finds a matching entry in the dataset, and returns that value

perl v5.10.1							    2004-09-06				    MakeMethods::Utility::Inheritable(3pm)

MakeMethods::Template::Inheritable(3pm) 		User Contributed Perl Documentation		   MakeMethods::Template::Inheritable(3pm)

NAME

       Class::MakeMethods::Template::Inheritable - Overridable data

SYNOPSIS

	 package MyClass;

	 use Class::MakeMethods( 'Template::Inheritable:scalar' => 'foo' );
	 # We now have an accessor method for an "inheritable" scalar value

	 MyClass->foo( 'Foozle' );   # Set a class-wide value
	 print MyClass->foo();	     # Retrieve class-wide value

	 my $obj = MyClass->new(...);
	 print $obj->foo();	     # All instances "inherit" that value...

	 $obj->foo( 'Foible' );      # until you set a value for an instance.
	 print $obj->foo();	     # This now finds object-specific value.
	 ...

	 package MySubClass;
	 @ISA = 'MyClass';

	 print MySubClass->foo();    # Intially same as superclass,
	 MySubClass->foo('Foobar');  # but overridable per subclass,
	 print $subclass_obj->foo(); # and shared by its instances
	 $subclass_obj->foo('Fosil');# until you override them...
	 ...

DESCRIPTION

       The MakeMethods subclass provides accessor methods that search an inheritance tree to find a value. This allows you to set a shared or
       default value for a given class, and optionally override it in a subclass.

   Standard Methods
       The following methods from Generic should be supported:

	 scalar
	 string
	 string_index (?)
	 number
	 boolean (?)
	 bits (?)
	 array (?)
	 hash (?)
	 tiedhash (?)
	 hash_of_arrays (?)
	 object (?)
	 instance (?)
	 array_of_objects (?)
	 code (?)
	 code_or_scalar (?)

       See Class::MakeMethods::Template::Generic for the interfaces and behaviors of these method types.

       The items marked with a * above are specifically defined in this package, whereas the others are formed automatically by the interaction of
       this package's generic settings with the code templates provided by the Generic superclass.

       The items marked with a ? above have not been tested sufficiently; please inform the author if they do not function as you would expect.

SEE ALSO

       See Class::MakeMethods for general information about this distribution.

       See Class::MakeMethods::Template for more about this family of subclasses.

       See Class::MakeMethods::Template::Generic for information about the various accessor interfaces subclassed herein.

       If you just need scalar accessors, see Class::Data::Inheritable for a very elegant and efficient implementation.

perl v5.10.1							    2004-09-06				   MakeMethods::Template::Inheritable(3pm)