NAME
Jojo::Base - Mojo::Base + lexical "has"
VERSION
version 0.4.1
SYNOPSIS
package Cat {
use Jojo::Base -base; # requires perl 5.18+
has name => 'Nyan';
has ['age', 'weight'] => 4;
}
package Tiger {
use Jojo::Base 'Cat';
has friend => sub { Cat->new };
has stripes => 42;
}
package main;
use Jojo::Base -strict;
my $mew = Cat->new(name => 'Longcat');
say $mew->age;
say $mew->age(3)->weight(5)->age;
my $rawr = Tiger->new(stripes => 38, weight => 250);
say $rawr->tap(sub { $_->friend->name('Tacgnol') })->weight;
DESCRIPTION
Jojo::Base works kind of like Mojo::Base but has
is imported as lexical subroutine.
Jojo::Base, like Mojo::Base, is a simple base class.
# Enables "strict", "warnings", "utf8" and Perl 5.18 and "lexical_subs" features
use Jojo::Base -strict;
use Jojo::Base -base;
use Jojo::Base 'SomeBaseClass';
use Jojo::Base -role;
All four forms save a lot of typing. Note that role support depends on Jojo::Role (0.3.0+).
# use Jojo::Base -strict;
use strict;
use warnings;
use utf8;
use feature ':5.18';
use experimental 'lexical_subs';
use IO::Handle ();
# use Jojo::Base -base;
use strict;
use warnings;
use utf8;
use feature ':5.18';
use experimental 'lexical_subs';
use IO::Handle ();
push @ISA, 'Jojo::Base';
state sub has { ... } # attributes
state sub with { ... } # role composition
# use Jojo::Base 'SomeBaseClass';
use strict;
use warnings;
use utf8;
use feature ':5.18';
use experimental 'lexical_subs';
use IO::Handle ();
require SomeBaseClass;
push @ISA, 'SomeBaseClass';
state sub has { ... } # attributes
state sub with { ... } # role composition
# use Jojo::Base -role;
use strict;
use warnings;
use utf8;
use feature ':5.18';
use experimental 'lexical_subs';
use IO::Handle ();
use Jojo::Role;
state sub has { ... } # attributes
On Perl 5.20+ you can also append a -signatures
flag to all four forms and enable support for subroutine signatures.
# Also enable signatures
use Jojo::Base -strict, -signatures;
use Jojo::Base -base, -signatures;
use Jojo::Base 'SomeBaseClass', -signatures;
use Jojo::Base -role, -signatures;
This will also disable experimental warnings on versions of Perl where this feature was still experimental.
DIFFERENCES FROM Mojo::Base
All functions are exported as lexical subs
Role support depends on Jojo::Role instead of Role::Tiny
with
is exported alongsidehas
(when Jojo::Role is available)Feature bundle for Perl 5.18 is enabled by default, instead of 5.10
Support for lexical subroutines is enabled by default
CAVEATS
Jojo::Base requires perl 5.18 or newer
Because a lexical sub does not behave like a package import, some code may need to be enclosed in blocks to avoid warnings like
"state" subroutine &has masks earlier declaration in same scope at...
SEE ALSO
AUTHOR
Adriano Ferreira <ferreira@cpan.org>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2017 by Adriano Ferreira.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)