# phpman > perldoc > Sub::Install ## NAME [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown) - install subroutines into packages easily ## VERSION version 0.928 ## SYNOPSIS use [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown); [Sub::Install::install_sub](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall%3A%3Ainstallsub/markdown)({ code => sub { ... }, into => $package, as => $subname }); ## DESCRIPTION This module makes it easy to install subroutines into packages without the unsightly mess of "no strict" or typeglobs lying about where just anyone can see them. ## FUNCTIONS install_sub [Sub::Install::install_sub](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall%3A%3Ainstallsub/markdown)({ code => \&subroutine, into => "[Finance::Shady](https://www.chedong.com/phpMan.php/perldoc/Finance%3A%3AShady/markdown)", as => 'launder', }); This routine installs a given code reference into a package as a normal subroutine. The above is equivalent to: no strict 'refs'; *{"[Finance::Shady](https://www.chedong.com/phpMan.php/perldoc/Finance%3A%3AShady/markdown)" . '::' . "launder"} = \&subroutine; If "into" is not given, the sub is installed into the calling package. If "code" is not a code reference, it is looked for as an existing sub in the package named in the "from" parameter. If "from" is not given, it will look in the calling package. If "as" is not given, and if "code" is a name, "as" will default to "code". If "as" is not given, but if "code" is a code ref, [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown) will try to find the name of the given code ref and use that as "as". That means that this code: [Sub::Install::install_sub](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall%3A%3Ainstallsub/markdown)({ code => 'twitch', from => '[Person::InPain](https://www.chedong.com/phpMan.php/perldoc/Person%3A%3AInPain/markdown)', into => '[Person::Teenager](https://www.chedong.com/phpMan.php/perldoc/Person%3A%3ATeenager/markdown)', as => 'dance', }); is the same as: package [Person::Teenager](https://www.chedong.com/phpMan.php/perldoc/Person%3A%3ATeenager/markdown); [Sub::Install::install_sub](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall%3A%3Ainstallsub/markdown)({ code => [Person::InPain](https://www.chedong.com/phpMan.php/perldoc/Person%3A%3AInPain/markdown)->can('twitch'), as => 'dance', }); reinstall_sub This routine behaves exactly like "install_sub", but does not emit a warning if warnings are on and the destination is already defined. install_installers This routine is provided to allow [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown) compatibility with [Sub::Installer](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstaller/markdown). It installs "install_sub" and "reinstall_sub" methods into the package named by its argument. [Sub::Install::install_installers](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall%3A%3Ainstallinstallers/markdown)('[Code::Builder](https://www.chedong.com/phpMan.php/perldoc/Code%3A%3ABuilder/markdown)'); # just for us, please [Code::Builder](https://www.chedong.com/phpMan.php/perldoc/Code%3A%3ABuilder/markdown)->install_sub({ name => $code_ref }); [Sub::Install::install_installers](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall%3A%3Ainstallinstallers/markdown)('UNIVERSAL'); # feeling lucky, punk? [Anything::At::All](https://www.chedong.com/phpMan.php/perldoc/Anything%3A%3AAt%3A%3AAll/markdown)->install_sub({ name => $code_ref }); The installed installers are similar, but not identical, to those provided by [Sub::Installer](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstaller/markdown). They accept a single hash as an argument. The key/value pairs are used as the "as" and "code" parameters to the "install_sub" routine detailed above. The package name on which the method is called is used as the "into" parameter. Unlike [Sub::Installer](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstaller/markdown)'s "install_sub" will not eval strings into code, but will look for named code in the calling package. ## EXPORTS [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown) exports "install_sub" and "reinstall_sub" only if they are requested. exporter [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown) has a never-exported subroutine called "exporter", which is used to implement its "import" routine. It takes a hashref of named arguments, only one of which is currently recognize: "exports". This must be an arrayref of subroutines to offer for export. This routine is mainly for [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown)'s own consumption. Instead, consider [Sub::Exporter](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AExporter/markdown). ## SEE ALSO [Sub::Installer](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstaller/markdown) This module is (obviously) a reaction to Damian Conway's [Sub::Installer](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstaller/markdown), which does the same thing, but does it by getting its greasy fingers all over UNIVERSAL. I was really happy about the idea of making the installation of coderefs less ugly, but I couldn't bring myself to replace the ugliness of typeglobs and loosened strictures with the ugliness of UNIVERSAL methods. [Sub::Exporter](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AExporter/markdown) This is a complete Exporter.pm replacement, built atop [Sub::Install](https://www.chedong.com/phpMan.php/perldoc/Sub%3A%3AInstall/markdown). ## EXTRA CREDITS Several of the tests are adapted from tests that shipped with Damian Conway's Sub-Installer distribution. ## AUTHOR Ricardo SIGNES <> ## COPYRIGHT AND LICENSE This software is copyright (c) 2005 by Ricardo SIGNES. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.