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Edit: UsingWithClassTiny.pod
=pod =encoding utf-8 =head1 NAME Type::Tiny::Manual::UsingWithClassTiny - use of Type::Tiny with Class::Tiny =head1 MANUAL L<Class::Tiny> is an even-smaller-than-Moo class builder. Let's translate the classic Horse class from Moo to Class::Tiny. Moo: package Horse { use Moo; use Types::Standard qw( Str Num ArrayRef ); use namespace::autoclean; has name => ( is => 'ro', isa => Str, required => 1 ); has gender => ( is => 'ro', isa => Str ); has age => ( is => 'rw', isa => Num ); has children => ( is => 'ro', isa => ArrayRef, default => sub { return [] }, ); } Class::Tiny: package Horse { use Class::Tiny qw( gender age ), { name => sub { die "name is required"; }, children => sub { return [] }, }; use Types::Standard qw( Str Num ArrayRef Dict Optional slurpy Any); use Type::Params qw( wrap_methods compile ); use namespace::autoclean; # type checks wrap_methods( BUILD => [Dict[ name => Str, gender => Optional[Str], age => Optional[Num], children => Optional[ArrayRef], slurpy Any, ]], name => [], gender => [], age => Optional[Num], children => [], ); } What's going on here? Well, Class::Tiny, after it has built a new object, will do this: $self->BUILD($args); (Technically, it calls C<BUILD> not just for the current class, but for all parent classes too.) We can hook onto this in order to check type constraints for the constructor. We use C<wrap_methods> from L<Type::Params> to wrap the original C<BUILD> method (which doesn't exist, so C<wrap_methods> will just assume an empty sub) with a type check for C<< $args >>. The type check is just a B<Dict> that checks the class's required and optional attributes and includes B<< slurpy Any >> at the end to be flexible for subclasses adding new attributes. Then we wrap the C<name>, C<gender>, and C<children> methods with checks to make sure they're only being called as getters, and we wrap C<age>, allowing it to be called as a setter with a B<Num>. There are also a couple of CPAN modules that can help you out. =head2 Class::Tiny::ConstrainedAccessor L<Class::Tiny::ConstrainedAccessor> creates a C<BUILD> and accessors that enforce Type::Tiny constraints. Attribute types are passed to Class::Tiny::ConstrainedAccessor; attribute defaults are passed to Class::Tiny. package Horse { use Types::Standard qw( Str Num ArrayRef ); use Class::Tiny::ConstrainedAccessor { name => Str, gender => Str, age => Num, children => ArrayRef, }; use Class::Tiny qw( gender age ), { name => sub { die "name is required"; }, children => sub { return [] }, }; } =head2 Class::Tiny::Antlers L<Class::Tiny::Antlers> provides Moose-like syntax for Class::Tiny, including support for C<isa>. You do not also need to use Class::Tiny itself. package Horse { use Class::Tiny::Antlers qw(has); use Types::Standard qw( Str Num ArrayRef ); use namespace::autoclean; has name => ( is => 'ro', isa => Str, default => sub { die "name is required" }, ); has gender => ( is => 'ro', isa => Str ); has age => ( is => 'rw', isa => Num ); has children => ( is => 'ro', isa => ArrayRef, default => sub { return [] }, ); } =head1 NEXT STEPS Here's your next step: =over =item * L<Type::Tiny::Manual::UsingWithOther> Using Type::Tiny with Class::InsideOut, Params::Check, and Object::Accessor. =back =head1 AUTHOR Toby Inkster E<lt>tobyink@cpan.orgE<gt>. =head1 COPYRIGHT AND LICENCE This software is copyright (c) 2013-2014, 2017-2021 by Toby Inkster. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =head1 DISCLAIMER OF WARRANTIES THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. =cut