NAME

Acme::CPANLists::PERLANCAR::Assert - Assertion

VERSION

This document describes version 0.21 of Acme::CPANLists::PERLANCAR::Assert (from Perl distribution Acme-CPANLists-PERLANCAR), released on 2017-06-19.

MODULE LISTS

Assertion

Assertion is a check statement that must evaluate to true or it will abort program's execution. It is useful during development/debugging:

 assert("there must be >3 arguments", sub { @args > 3 });

In production code, compilers ideally do not generate code for assertion statements so they do not have any impact on runtime performance.

In the old days, you only have this alternative to do it in Perl:

 assert(...) if DEBUG;

where DEBUG is a constant subroutine, declared using:

 use constant DEBUG => 0;

or:

 sub DEBUG() { 0 }

The perl compiler will optimize away and remove the code entirely when DEBUG is false. But having to add if DEBUG to each assertion is annoying and error-prone.

Nowadays, you have several alternatives to have a true, C-like assertions. One technique is using Devel::Declare (e.g. PerlX::Assert). Another technique is using B::CallChecker (e.g. Assert::Conditional).

• Assert::Conditional

• PerlX::Assert

• Devel::Assert

HOMEPAGE

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

SOURCE

Source repository is at https://github.com/perlancar/perl-Acme-CPANLists-PERLANCAR.

BUGS

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

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.

SEE ALSO

Acme::CPANLists - about the Acme::CPANLists namespace

acme-cpanlists - CLI tool to let you browse/view the lists

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2017, 2016, 2015 by 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.

cpanm Acme::CPANLists::PERLANCAR

perl -MCPAN -e shell
install Acme::CPANLists::PERLANCAR