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.\" ========================================================================
.\"
.IX Title "MakeMethods::Emulator::Inheritable 3pm"
.TH MakeMethods::Emulator::Inheritable 3pm "2004-09-06" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Class::MakeMethods::Emulator::Inheritable \- Emulate Class::Inheritable
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  package Stuff;
\&  use base qw(Class::MakeMethods::Emulator::Inheritable);
\&
\&  # Set up DataFile as inheritable class data.
\&  Stuff\->mk_classdata(\*(AqDataFile\*(Aq);
\&
\&  # Declare the location of the data file for this class.
\&  Stuff\->DataFile(\*(Aq/etc/stuff/data\*(Aq);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is an adaptor that provides emulatation of Class::Data::Inheritable by invoking similiar functionality provided by Class::MakeMethods::ClassInherit.
.PP
The public interface provided by Class::MakeMethods::Emulator::Inheritable is identical to that of Class::Data::Inheritable.
.PP
Class::Data::Inheritable is for creating accessor/mutators to class
data.  That is, if you want to store something about your class as a
whole (instead of about a single object).  This data is then inherited
by your subclasses and can be overriden.
.SH "USAGE"
.IX Header "USAGE"
As specified by Class::Data::Inheritable, clients should inherit from this module and then invoke the \fImk_classdata()\fR method for each class method desired:
.PP
.Vb 1
\&  Class\->mk_classdata($data_accessor_name);
.Ve
.PP
This is a class method used to declare new class data accessors.  A
new accessor will be created in the Class using the name from
\&\f(CW$data_accessor_name\fR.
.PP
.Vb 1
\&  Class\->mk_classdata($data_accessor_name, $initial_value);
.Ve
.PP
You may also pass a second argument to initialize the value.
.PP
To facilitate overriding, mk_classdata creates an alias to the
accessor, \fI_field_accessor()\fR.  So \fISuitcase()\fR would have an alias
\&\fI_Suitcase_accessor()\fR that does the exact same thing as \fISuitcase()\fR.
This is useful if you want to alter the behavior of a single accessor
yet still get the benefits of inheritable class data.  For example.
.PP
.Vb 3
\&  sub Suitcase {
\&      my($self) = shift;
\&      warn "Fashion tragedy" if @_ and $_[0] eq \*(AqPlaid\*(Aq;
\&
\&      $self\->_Suitcase_accessor(@_);
\&  }
.Ve
.SH "COMPATIBILITY"
.IX Header "COMPATIBILITY"
Note that the internal implementation of Class::MakeMethods::ClassInherit does not match that of Class::Data::Inheritable. In particular, Class::Data::Inheritable installs new methods in subclasses when they first initialize their value, while
.SH "EXAMPLE"
.IX Header "EXAMPLE"
The example provided by Class::Data::Inheritable is equally applicable to this emulator.
.PP
.Vb 3
\&  package Pere::Ubu;
\&  use base qw(Class::MakeMethods::Emulator::Inheritable);
\&  Pere::Ubu\->mk_classdata(\*(AqSuitcase\*(Aq);
.Ve
.PP
will generate the method \fISuitcase()\fR in the class Pere::Ubu.
.PP
This new method can be used to get and set a piece of class data.
.PP
.Vb 2
\&  Pere::Ubu\->Suitcase(\*(AqRed\*(Aq);
\&  $suitcase = Pere::Ubu\->Suitcase;
.Ve
.PP
The interesting part happens when a class inherits from Pere::Ubu:
.PP
.Vb 2
\&  package Raygun;
\&  use base qw(Pere::Ubu);
\&  
\&  # Raygun\*(Aqs suitcase is Red.
\&  $suitcase = Raygun\->Suitcase;
.Ve
.PP
Raygun inherits its Suitcase class data from Pere::Ubu.
.PP
Inheritance of class data works analgous to method inheritance.  As
long as Raygun does not \*(L"override\*(R" its inherited class data (by using
\&\fISuitcase()\fR to set a new value) it will continue to use whatever is set
in Pere::Ubu and inherit further changes:
.PP
.Vb 2
\&  # Both Raygun\*(Aqs and Pere::Ubu\*(Aqs suitcases are now Blue
\&  Pere::Ubu\->Suitcase(\*(AqBlue\*(Aq);
.Ve
.PP
However, should Raygun decide to set its own \fISuitcase()\fR it has now
\&\*(L"overridden\*(R" Pere::Ubu and is on its own, just like if it had
overriden a method:
.PP
.Vb 2
\&  # Raygun has an orange suitcase, Pere::Ubu\*(Aqs is still Blue.
\&  Raygun\->Suitcase(\*(AqOrange\*(Aq);
.Ve
.PP
Now that Raygun has overridden Pere::Ubu futher changes by Pere::Ubu
no longer effect Raygun.
.PP
.Vb 2
\&  # Raygun still has an orange suitcase, but Pere::Ubu is using Samsonite.
\&  Pere::Ubu\->Suitcase(\*(AqSamsonite\*(Aq);
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
See Class::MakeMethods for general information about this distribution.
.PP
See Class::MakeMethods::Emulator for more about this family of subclasses.
.PP
See Class::Data::Inheritable for documentation of the original module.
.PP
See perltootc for a discussion of class data in Perl.
.PP
See Class::MakeMethods::Standard::Inheritable and Class::MakeMethods::Template::ClassInherit for inheritable data methods.