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Ettore Di Giacinto
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Deeme::Obj - Minimal base class for Deeme


  package Cat;
  use Deeme::Obj -base;

  has name => 'Nyan';
  has [qw(birds mice)] => 2;

  package Tiger;
  use Deeme::Obj 'Cat';

  has friend  => sub { Cat->new };
  has stripes => 42;

  package main;
  use Deeme::Obj -strict;

  my $mew = Cat->new(name => 'Longcat');
  say $mew->mice;
  say $mew->mice(3)->birds(4)->mice;

  my $rawr = Tiger->new(stripes => 23, mice => 0);
  say $rawr->tap(sub { $_->friend->name('Tacgnol') })->mice;


Deeme::Obj is a simple base class for Deeme, a fork of Mojo::Base.

  # Automatically enables "strict", "warnings", "utf8" and Perl 5.10 features
  use Deeme::Obj -strict;
  use Deeme::Obj -base;
  use Deeme::Obj 'SomeBaseClass';

All three forms save a lot of typing.

  # use Deeme::Obj -strict;
  use strict;
  use warnings;
  use utf8;
  use feature ':5.10';
  use IO::Handle ();

  # use Deeme::Obj -base;
  use strict;
  use warnings;
  use utf8;
  use feature ':5.10';
  use IO::Handle ();
  use Deeme::Obj;
  push @ISA, 'Deeme::Obj';
  sub has { Deeme::Obj::attr(__PACKAGE__, @_) }

  # use Deeme::Obj 'SomeBaseClass';
  use strict;
  use warnings;
  use utf8;
  use feature ':5.10';
  use IO::Handle ();
  require SomeBaseClass;
  push @ISA, 'SomeBaseClass';
  use Deeme::Obj;
  sub has { Deeme::Obj::attr(__PACKAGE__, @_) }


Deeme::Obj implements the following functions like Mojo::Base, which can be imported with the -base flag or by setting a base class.


  has 'name';
  has [qw(name1 name2 name3)];
  has name => 'foo';
  has name => sub {...};
  has [qw(name1 name2 name3)] => 'foo';
  has [qw(name1 name2 name3)] => sub {...};

Create attributes for hash-based objects, just like the "attr" method.


Deeme::Obj implements the following methods.


  BaseSubClass->attr([qw(name1 name2 name3)]);
  BaseSubClass->attr(name => 'foo');
  BaseSubClass->attr(name => sub {...});
  BaseSubClass->attr([qw(name1 name2 name3)] => 'foo');
  BaseSubClass->attr([qw(name1 name2 name3)] => sub {...});

Create attribute accessor for hash-based objects, an array reference can be used to create more than one at a time. Pass an optional second argument to set a default value, it should be a constant or a callback. The callback will be executed at accessor read time if there's no set value. Accessors can be chained, that means they return their invocant when they are called with an argument.


  my $object = BaseSubClass->new;
  my $object = BaseSubClass->new(name => 'value');
  my $object = BaseSubClass->new({name => 'value'});

This base class provides a basic constructor for hash-based objects. You can pass it either a hash or a hash reference with attribute values.


  $object = $object->tap(sub {...});

K combinator, tap into a method chain to perform operations on an object within the chain. The object will be the first argument passed to the callback and is also available as $_.


You can set the DEEME_OBJ_DEBUG environment variable to get some advanced diagnostics information printed to STDERR.



Deeme, Mojo::Base.