NAME

Acme::CPANModules::MultipleDispatch - List of modules to do smart matching

VERSION

This document describes version 0.001 of Acme::CPANModules::MultipleDispatch (from Perl distribution Acme-CPANModules-MultipleDispatch), released on 2024-07-01.

DESCRIPTION

About multiple dispatch

Multiple dispatch is a technique where you can define /multiple/ functions (or methods) of the same name but with different signatures (e.g. different type of arguments, different number of arguments) and the runtime will choose (/dispatch/) the correct function by matching the signature of the caller to that of the defined functions.

This technique has several benefits, mostly simplifying user code particularly when dealing with different types/arguments, because you are deferring the checks to the runtime. For example, if you create a function to concat two strings:

function combine(Str a, Str b) {
    a + b;
}

and later wants to support some other types, instead of peppering the original function with if statements, you can just supply additional functions with the same name but with different arguments you want to support:

function combine(Num a, Num b) {
    a.as_str() + b.as_str();
}

function combine(File a, File b) {
    a.open().read() + b.open().read();
}

Some languages, particularly strongly-typed ones, support multiple dispatch: Julia, C#, Common Lisp, Groovy. Raku (Perl 6) also supports multiple dispatch.

Perl 5 does not. But some modules will allow you to fake it.

Modules

Multi::Dispatch. By DCONWAY.

Dios. Also by DCONWAY. An object system which supports multiple dispatch.

Class::Multimethods. Older module by DCONWAY.

Keywords

multi dispatch, multisub, multimethod.

ACME::CPANMODULES ENTRIES

Multi::Dispatch

Author: DCONWAY

Dios

Author: DCONWAY

Class::Multimethods

Author: DCONWAY

FAQ

What is an Acme::CPANModules::* module?

An Acme::CPANModules::* module, like this module, contains just a list of module names that share a common characteristics. It is a way to categorize modules and document CPAN. See Acme::CPANModules for more details.

What are ways to use this Acme::CPANModules module?

Aside from reading this Acme::CPANModules module's POD documentation, you can install all the listed modules (entries) using cpanm-cpanmodules script (from App::cpanm::cpanmodules distribution):

% cpanm-cpanmodules -n MultipleDispatch

Alternatively you can use the cpanmodules CLI (from App::cpanmodules distribution):

% cpanmodules ls-entries MultipleDispatch | cpanm -n

or Acme::CM::Get:

% perl -MAcme::CM::Get=MultipleDispatch -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

or directly:

% perl -MAcme::CPANModules::MultipleDispatch -E'say $_->{module} for @{ $Acme::CPANModules::MultipleDispatch::LIST->{entries} }' | cpanm -n

This Acme::CPANModules module also helps lcpan produce a more meaningful result for lcpan related-mods command when it comes to finding related modules for the modules listed in this Acme::CPANModules module. See App::lcpan::Cmd::related_mods for more details on how "related modules" are found.

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Acme-CPANModules-MultipleDispatch.

SOURCE

Source repository is at https://github.com/perlancar/perl-Acme-CPANModules-MultipleDispatch.

SEE ALSO

Bencher::ScenarioBundle::SmartMatch

Acme::CPANModules - about the Acme::CPANModules namespace

cpanmodules - CLI tool to let you browse/view the lists

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

% prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This software is copyright (c) 2024 by perlancar <perlancar@cpan.org>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Acme-CPANModules-MultipleDispatch

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

cpanm Acme::CPANModules::MultipleDispatch

perl -MCPAN -e shell
install Acme::CPANModules::MultipleDispatch