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.\"
.IX Title "MakeMethods::Utility::Inheritable 3pm"
.TH MakeMethods::Utility::Inheritable 3pm "2016-06-10" "perl v5.22.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Class::MakeMethods::Utility::Inheritable \- "Inheritable" data
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  package MyClass;
\&  sub new { ... }
\&  
\&  package MySubclass;
\&  @ISA = \*(AqMyClass\*(Aq;
\&  ...
\&  my $obj = MyClass\->new(...);
\&  my $subobj = MySubclass\->new(...);
\&  
\&  use Class::MakeMethods::Utility::Inheritable qw(get_vvalue set_vvalue );
\&  
\&  my $dataset = {};
\&  set_vvalue($dataset, \*(AqMyClass\*(Aq, \*(AqFoobar\*(Aq);    # Set value for class
\&  get_vvalue($dataset, \*(AqMyClass\*(Aq);              # Gets value "Foobar"
\&  
\&  get_vvalue($dataset, $obj);                   # Objects "inherit"
\&  set_vvalue($dataset, $obj, \*(AqFoible\*(Aq);         # Until you override
\&  get_vvalue($dataset, $obj);                   # Now finds "Foible"
\&  
\&  get_vvalue($dataset, \*(AqMySubclass\*(Aq);           # Subclass "inherits"
\&  get_vvalue($dataset, $subobj);                # As do its objects
\&  set_vvalue($dataset, \*(AqMySubclass\*(Aq, \*(AqFoozle\*(Aq); # Until we override it
\&  get_vvalue($dataset, \*(AqMySubclass\*(Aq);           # Now finds "Foozle"
\&  
\&  get_vvalue($dataset, $subobj);                # Change cascades down
\&  set_vvalue($dataset, $subobj, \*(AqFoolish\*(Aq);     # Until we override again
\&  
\&  get_vvalue($dataset, \*(AqMyClass\*(Aq);              # Superclass is unchanged
.Ve
.SH "DESCRIPTION"
.IX Header "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.
.PP
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 overridden on a per-object level.
.SH "REFERENCE"
.IX Header "REFERENCE"
.SS "find_vself"
.IX Subsection "find_vself"
.Vb 1
\&  $vself = find_vself( $dataset, $instance );
.Ve
.PP
Searches \f(CW$instance\fR's inheritance tree until it finds a matching entry in the dataset, and returns either the instance, the class that matched, or undef.
.SS "get_vvalue"
.IX Subsection "get_vvalue"
.Vb 1
\&  $value = get_vvalue( $dataset, $instance );
.Ve
.PP
Searches \f(CW$instance\fR's inheritance tree until it finds a matching entry in the dataset, and returns that value
.SS "set_vvalue"
.IX Subsection "set_vvalue"
.Vb 1
\&  $value = set_vvalue( $dataset, $instance, $value );
.Ve
.PP
Searches \f(CW$instance\fR's inheritance tree until it finds a matching entry in the dataset, and returns that value