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Test2::Util::HashBase(3)





NAME

       Test2::Util::HashBase - Build hash based classes.


SYNOPSIS

       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');

           #'-bar' means read-only, so the setter will throw an exception (but is defined).
           $one->set_bar('A bar');

           # '^baz' means deprecated setter, this will warn about the setter being
           # deprecated.
           $one->set_baz('A Baz');

           $one->{+FOO} = 'xxx';


DESCRIPTION

       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 inheritance is also supported.


THIS IS A BUNDLED COPY OF HASHBASE

       This is a bundled copy of Object::HashBase. This file was generated
       using the "/home/exodist/perl5/perlbrew/perls/main/bin/hashbase_inc.pl"
       script.


METHODS

   PROVIDED BY HASH BASE
       $it = $class->new(@VALUES)
           Create a new instance using key/value pairs.

           HashBase will not export "new()" if there is already a "new()"
           method in your packages inheritance chain.

           If you do not want this method you can define your own you just
           have to declare it before loading Test2::Util::HashBase.

               package My::Package;

               # predeclare new() so that HashBase does not give us one.
               sub new;

               use Test2::Util::HashBase qw/foo bar baz/;

               # Now we define our own new method.
               sub new { ... }

           This makes it so that HashBase sees that you have your own "new()"
           method.  Alternatively you can define the method before loading
           HashBase instead of just declaring it, but that scatters your use
           statements.

   HOOKS
       $self->init()
           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.


ACCESSORS

       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:

       foo()
           Getter, used to get the value of the "foo" field.

       set_foo()
           Setter, used to set the value of the "foo" field.

       FOO()
           Constant, returns 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.


SUBCLASSING

       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.


SOURCE

       The source code repository for HashBase can be found at
       http://github.com/Test-More/HashBase/.


MAINTAINERS

       Chad Granum <exodist@cpan.org>


AUTHORS

       Chad Granum <exodist@cpan.org>


COPYRIGHT

       Copyright 2016 Chad Granum <exodist@cpan.org>.

       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/



perl v5.26.1                      2017-07-18        Test2::Util::HashBase(3pm)

perl 5.26.1 - Generated Wed Nov 8 16:07:25 CST 2017
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