Test2::Util::HashBase - Base class for classes that use a hashref of a hash.
This is an experimental release. Using this right now is not recommended.
A class:
package My::Class; use strict; use warnings; # Generate 3 accessors use Test2::Util::HashBase qw/foo bar baz/; # Chance to initialize defaults sub init { my $self = shift; # No other args $self->{+FOO} ||= "foo"; $self->{+BAR} ||= "bar"; $self->{+BAZ} ||= "baz"; } sub print { print join ", " => map { $self->{$_} } FOO, BAR, BAZ; }
Subclass it
package My::Subclass; use strict; use warnings; # Note, you should subclass before loading HashBase. use base 'My::Class'; use Test2::Util::HashBase qw/bat/; sub init { my $self = shift; # We get the constants from the base class for free. $self->{+FOO} ||= 'SubFoo'; $self->{+BAT} || = 'bat'; $self->SUPER::init(); }
use it:
package main; use strict; use warnings; use My::Class; my $one = My::Class->new(foo => 'MyFoo', bar => 'MyBar'); # Accessors! my $foo = $one->foo; # 'MyFoo' my $bar = $one->bar; # 'MyBar' my $baz = $one->baz; # Defaulted to: 'baz' # Setters! $one->set_foo('A Foo'); $one->set_bar('A Bar'); $one->set_baz('A Baz'); $one->{+FOO} = 'xxx';
This package is used to generate classes based on hashrefs. Using this class will give you a new() method, as well as generating accessors you request. Generated accessors will be getters, set_ACCESSOR setters will also be generated for you. You also get constants for each accessor (all caps) which return the key into the hash for that accessor. Single inheritence is also supported.
new()
set_ACCESSOR
Create a new instance using key/value pairs.
This gives you the chance to set some default values to your fields. The only argument is $self with its indexes already set from the constructor.
$self
To generate accessors you list them when using the module:
use Test2::Util::HashBase qw/foo/;
This will generate the following subs in your namespace:
Getter, used to get the value of the foo field.
foo
Setter, used to set the value of the foo field.
Constant, returs the field foo's key into the class hashref. Subclasses will also get this function as a constant, not simply a method, that means it is copied into the subclass namespace.
The main reason for using these constants is to help avoid spelling mistakes and similar typos. It will not help you if you forget to prefix the '+' though.
You can subclass an existing HashBase class.
use base 'Another::HashBase::Class'; use Test2::Util::HashBase qw/foo bar baz/;
The base class is added to @ISA for you, and all constants from base classes are added to subclasses automatically.
@ISA
The source code repository for Test2 can be found at http://github.com/Test-More/Test2/.
Copyright 2015 Chad Granum <exodist7@gmail.com>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See http://dev.perl.org/licenses/
To install Test2, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Test2
CPAN shell
perl -MCPAN -e shell install Test2
For more information on module installation, please visit the detailed CPAN module installation guide.