Class::MakeMethods::Composite

NAME

Class::MakeMethods::Composite - Make extensible compound methods

SYNOPSIS

  package MyObject;
  use Class::MakeMethods::Composite::Hash (
    new => 'new',
    scalar => [ 'foo', 'bar' ],
    array => 'my_list',
    hash => 'my_index',
  );

DESCRIPTION

This document describes the various subclasses of Class::MakeMethods included under the Composite::* namespace, and the method types each one provides.

The Composite subclasses provide a parameterized set of method-generation implementations.

Subroutines are generated as closures bound to a hash containing the method name and additional parameters, including the arrays of subroutine references that will provide the method's functionality.

Calling Conventions

When you "use" this package, the method names you provide as arguments cause subroutines to be generated and installed in your module.

See "Calling Conventions" in Class::MakeMethods::Standard for more information.

Declaration Syntax

To declare methods, pass in pairs of a method-type name followed by one or more method names.

Valid method-type names for this package are listed in "METHOD GENERATOR TYPES".

See "Declaration Syntax" in Class::MakeMethods::Standard and "Parameter Syntax" in Class::MakeMethods::Standard for more information.

About Composite Methods

The methods generated by Class::MakeMethods::Composite are assembled from groups of "fragment" subroutines, each of which provides some aspect of the method's behavior.

You can add pre- and post- operations to any composite method.

  package MyObject;
  use Class::MakeMethods::Composite::Hash (
    new => 'new',
    scalar => [ 
      'foo' => { 
        'pre_rules' => [ 
          sub {
            # Don't automatically convert list to array-ref
            croak "Too many arguments" if ( scalar @_ > 2 );
          }
        ],
        'post_rules' => [ 
          sub {
            # Don't let anyone see my credit card number!
            ${(pop)->{result}} =~ s/\d{13,16}/****/g;
          }
        ],
      }
    ],
  );