NAME isa - isn't the isa operator SYNOPSIS use isa 'HTTP::Tiny'; my $obj = MyApp->get_user_agent; if ( isa_HTTP_Tiny $obj ) { my $response = $obj->get( 'https://www.example.com/' ); MyApp->do_something( $response ); } DESCRIPTION The new `isa` operator in Perl 5.30 is pretty great, but if you need to support legacy versions of Perl, you can't use it yet. This module gives you isa-like functions you can use in Perl 5.6 and above. If you've got Type::Tiny::XS installed, you will probably find that this module is *faster* than the native `isa` operator! IMPORT You need to list the classes you'll be using on the `use` line. use isa 'HTTP::Tiny', 'MyApp::Person'; This module will replace the "::" bits with underscores, and prefix "isa_" to each name to create functions like `isa_HTTP_Tiny` and `isa_MyApp_Person`. Alternative Style If you'd prefer to pick your own names for the imported functions, you can use a hashref in the import: use isa { isa_Browser => 'HTTP::Tiny', isa_Person => 'MyApp::Person', }; You can't mix and match styles within one import, but you can `use isa` more than once. BUGS Please report any bugs to . SEE ALSO perlop, Scalar::Util. AUTHOR Toby Inkster . COPYRIGHT AND LICENCE This software is copyright (c) 2020 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. 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.