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Manual Reference Pages  -  CLASS::MAKEMETHODS::TEMPLATE::HASH (3)

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NAME

Class::MakeMethods::Template::Hash - Method interfaces for hash-based objects

CONTENTS

SYNOPSIS



  package MyObject;
  use Class::MakeMethods::Template::Hash (
    new             => [ new ],
    scalar          => [ foo, bar ]
  );
 
  package main;

  my $obj = MyObject->new( foo => "Foozle", bar => "Bozzle" );
  print $obj->foo();
  $obj->bar("Bamboozle");



DESCRIPTION

These meta-methods create and access values within blessed hash objects.

<B>Common ParametersB>: The following parameters are defined for Hash meta-methods.
hash_key The hash key to use when retrieving values from each hash instance. Defaults to ’*’, the name of the meta-method.

Changing this allows you to change an accessor method name to something other than the name of the hash key used to retrieve its value.

Note that this parameter is not portable to the other implementations, such as Global or InsideOut.

You can take advantage of parameter expansion to define methods whose hash key is composed of the defining package’s name and the individual method name, such as $self->{MyObject-foo}:



      hash_key => *{target_class}-*{name}



<B>Common BehaviorsB>
Behavior: delete Deletes the named key and associated value from the current hash instance.

    Standard Methods

The following methods from Generic are all supported:



  new
  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.

    struct



  struct => [ qw / foo bar baz / ];



Creates methods for setting, checking and clearing values which are stored by position in an array. All the slots created with this meta-method are stored in a single array.

The argument to struct should be a string or a reference to an array of strings. For each string meta-method x, it defines two methods: x and clear_x. x returns the value of the x-slot. If called with an argument, it first sets the x-slot to the argument. clear_x sets the slot to undef.

Additionally, struct defines three class method: struct, which returns a list of all of the struct values, struct_fields, which returns a list of all the slots by name, and struct_dump, which returns a hash of the slot-name/slot-value pairs.

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.

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perl v5.20.3 MAKEMETHODS::TEMPLATE::HASH (3) 2004-09-06

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