Steve Purkis > accessors-1.01 > accessors

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NAME ^

accessors - create accessor methods in caller's package.

SYNOPSIS ^

  package Foo;
  use accessors qw( foo bar baz );

  my $obj = bless {}, 'Foo';

  # generates chaining accessors
  # that you can set like this:
  $obj->foo( 'hello ' )
      ->bar( 'world' )
      ->baz( "!\n" );

  # you get the values by passing no params:
  print $obj->foo, $obj->bar, $obj->baz;

DESCRIPTION ^

The accessors pragma lets you create simple accessors at compile-time.

This saves you from writing them by hand, which tends to result in cut-n-paste errors and a mess of duplicated code. It can also help you reduce the ammount of unwanted direct-variable access that may creep into your codebase when you're feeling lazy. accessors was designed with laziness in mind.

Method-chaining accessors are generated by default. Note that you can still use accessors::chained directly for reasons of backwards compatability.

See accessors::classic for accessors that always return the current value if you don't like method chaining.

GENERATED METHODS ^

accessors will generate methods that return the current object on set:

  sub foo {
      my $self = shift;
      if (@_) { $self->{-foo} = shift; return $self; }
      else    { return $self->{-foo}; }
  }

This way they can be chained together.

Why prepend the dash?

The dash (-) is prepended to the property name for a few reasons:

You shouldn't care too much about how the property is stored anyway - if you do, you're likely trying to do something special (and should really consider writing the accessors out long hand), or it's simply a matter of preference in which case you can use accessors::classic, or sub-class this module.

PERFORMANCE ^

There is little-to-no performace hit when using generated accessors; in fact there is usually a performance gain.

See the benchmark tests included with this distribution for more details.

MOTIVATION ^

The main difference between the accessors pragma and other accessor generators is simplicity.

SUB-CLASSING ^

If you prefer a different style of accessor or you need to do something more complicated, there's nothing to stop you from sub-classing. It should be pretty easy. Look through accessors::classic, accessors::ro, and accessors::rw to see how it's done.

CAVEATS ^

Classes using blessed scalarrefs, arrayrefs, etc. are not supported for sake of simplicity. Only hashrefs are supported.

THANKS ^

Thanks to Michael G. Schwern for indirectly inspiring this module, and for his feedback & suggestions.

Also to Paul Makepeace and David Wright for showing me faster accessors, to chocolateboy for his contributions, the CPAN Testers for their bug reports, and to James Duncan and people on London.pm for their feedback.

AUTHOR ^

Steve Purkis <spurkis@cpan.org>

SEE ALSO ^

accessors::classic, accessors::chained

Similar and related modules:

base, fields, Class::Accessor, Class::Struct, Class::Methodmaker, Class::Generate, Class::Class, Class::Tangram, Object::Tiny

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