CINXE.COM
warnings - Perl pragma to control optional warnings - Perldoc Browser
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>warnings - Perl pragma to control optional warnings - Perldoc Browser</title> <link rel="search" href="/opensearch.xml" type="application/opensearchdescription+xml" title="Perldoc Browser"> <link rel="canonical" href="https://perldoc.perl.org/warnings"> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.5.0/styles/stackoverflow-light.min.css" integrity="sha512-cG1IdFxqipi3gqLmksLtuk13C+hBa57a6zpWxMeoY3Q9O6ooFxq50DayCdm0QrDgZjMUn23z/0PMZlgft7Yp5Q==" crossorigin="anonymous" /> <style> body { background: #f4f4f5; color: #020202; } .navbar-dark { background-image: -webkit-linear-gradient(top, #005f85 0, #002e49 100%); background-image: -o-linear-gradient(top, #005f85 0, #002e49 100%); background-image: linear-gradient(to bottom, #005f85 0, #002e49 100%); filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff005f85', endColorstr='#ff002e49', GradientType=0); background-repeat: repeat-x; } .navbar-dark .navbar-nav .nav-link, .navbar-dark .navbar-nav .nav-link:focus { color: #fff } .navbar-dark .navbar-nav .nav-link:hover { color: #ffef68 } #wrapperlicious { margin: 0 auto; font: 0.9em 'Helvetica Neue', Helvetica, sans-serif; font-weight: normal; line-height: 1.5em; margin: 0; padding: 0; } #wrapperlicious h1 { font-size: 1.5em } #wrapperlicious h2 { font-size: 1.3em } #wrapperlicious h3 { font-size: 1.1em } #wrapperlicious h4 { font-size: 0.9em } #wrapperlicious h1, #wrapperlicious h2, #wrapperlicious h3, #wrapperlicious h4, #wrapperlicious dt { color: #020202; margin-top: 1em; margin-bottom: 1em; position: relative; font-weight: bold; } #wrapperlicious a { color: inherit; text-decoration: underline } #wrapperlicious #toc { text-decoration: none } #wrapperlicious a:hover { color: #2a2a2a } #wrapperlicious a img { border: 0 } #wrapperlicious :not(pre) > code { color: inherit; background-color: rgba(0, 0, 0, 0.04); border-radius: 3px; font: 0.9em Consolas, Menlo, Monaco, monospace; padding: 0.3em; } #wrapperlicious dd { margin: 0; margin-left: 2em; } #wrapperlicious dt { color: #2a2a2a; font-weight: bold; margin-left: 0.9em; } #wrapperlicious p { margin-bottom: 1em; margin-top: 1em; } #wrapperlicious li > p { margin-bottom: 0; margin-top: 0; } #wrapperlicious pre { border: 1px solid #c1c1c1; border-radius: 3px; font: 100% Consolas, Menlo, Monaco, monospace; margin-bottom: 1em; margin-top: 1em; } #wrapperlicious pre > code { display: block; background-color: #f6f6f6; font: 0.9em Consolas, Menlo, Monaco, monospace; line-height: 1.5em; text-align: left; white-space: pre; padding: 1em; } #wrapperlicious dl, #wrapperlicious ol, #wrapperlicious ul { margin-bottom: 1em; margin-top: 1em; } #wrapperlicious ul { list-style-type: square; } #wrapperlicious ul ul { margin-bottom: 0px; margin-top: 0px; } #footer { font-size: 0.8em; padding-top: 0.5em; text-align: center; } #more { display: inline; font-size: 0.8em; } #perldocdiv { background-color: #fff; border: 1px solid #c1c1c1; border-bottom-left-radius: 5px; border-bottom-right-radius: 5px; margin-left: auto; margin-right: auto; padding: 3em; padding-top: 1em; max-width: 960px; } #moduleversion { float: right } #wrapperlicious .leading-notice { font-style: italic; padding-left: 1em; margin-top: 1em; margin-bottom: 1em; } #wrapperlicious .permalink { display: none; left: -0.75em; position: absolute; padding-right: 0.25em; text-decoration: none; } #wrapperlicious h1:hover .permalink, #wrapperlicious h2:hover .permalink, #wrapperlicious h3:hover .permalink, #wrapperlicious h4:hover .permalink, #wrapperlicious dt:hover .permalink { display: block; } </style> <!-- Global site tag (gtag.js) - Google Analytics --> <script async src="https://www.googletagmanager.com/gtag/js?id=G-KVNWBNT5FB"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-KVNWBNT5FB'); gtag('config', 'UA-50555-3'); </script> </head> <body> <nav class="navbar navbar-expand-md navbar-dark bg-dark justify-content-between"> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <a class="navbar-brand" href="/"><img src="/images/perl_camel_30.png" width="30" height="30" class="d-inline-block align-top" alt="Perl Camel Logo"> Perldoc Browser</a> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="navbar-nav mr-auto"> <li class="nav-item dropdown text-nowrap"> <a class="nav-link dropdown-toggle" href="#" id="dropdownlink-stable" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">5.18.2</a> <div class="dropdown-menu" aria-labelledby="dropdownlink-stable"> <a class="dropdown-item" href="/warnings">Latest</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.40.1/warnings">5.40.1</a> <a class="dropdown-item" href="/5.40.0/warnings">5.40.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.38.3/warnings">5.38.3</a> <a class="dropdown-item" href="/5.38.2/warnings">5.38.2</a> <a class="dropdown-item" href="/5.38.1/warnings">5.38.1</a> <a class="dropdown-item" href="/5.38.0/warnings">5.38.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.36.3/warnings">5.36.3</a> <a class="dropdown-item" href="/5.36.2/warnings">5.36.2</a> <a class="dropdown-item" href="/5.36.1/warnings">5.36.1</a> <a class="dropdown-item" href="/5.36.0/warnings">5.36.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.34.3/warnings">5.34.3</a> <a class="dropdown-item" href="/5.34.2/warnings">5.34.2</a> <a class="dropdown-item" href="/5.34.1/warnings">5.34.1</a> <a class="dropdown-item" href="/5.34.0/warnings">5.34.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.32.1/warnings">5.32.1</a> <a class="dropdown-item" href="/5.32.0/warnings">5.32.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.30.3/warnings">5.30.3</a> <a class="dropdown-item" href="/5.30.2/warnings">5.30.2</a> <a class="dropdown-item" href="/5.30.1/warnings">5.30.1</a> <a class="dropdown-item" href="/5.30.0/warnings">5.30.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.28.3/warnings">5.28.3</a> <a class="dropdown-item" href="/5.28.2/warnings">5.28.2</a> <a class="dropdown-item" href="/5.28.1/warnings">5.28.1</a> <a class="dropdown-item" href="/5.28.0/warnings">5.28.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.26.3/warnings">5.26.3</a> <a class="dropdown-item" href="/5.26.2/warnings">5.26.2</a> <a class="dropdown-item" href="/5.26.1/warnings">5.26.1</a> <a class="dropdown-item" href="/5.26.0/warnings">5.26.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.24.4/warnings">5.24.4</a> <a class="dropdown-item" href="/5.24.3/warnings">5.24.3</a> <a class="dropdown-item" href="/5.24.2/warnings">5.24.2</a> <a class="dropdown-item" href="/5.24.1/warnings">5.24.1</a> <a class="dropdown-item" href="/5.24.0/warnings">5.24.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.22.4/warnings">5.22.4</a> <a class="dropdown-item" href="/5.22.3/warnings">5.22.3</a> <a class="dropdown-item" href="/5.22.2/warnings">5.22.2</a> <a class="dropdown-item" href="/5.22.1/warnings">5.22.1</a> <a class="dropdown-item" href="/5.22.0/warnings">5.22.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.20.3/warnings">5.20.3</a> <a class="dropdown-item" href="/5.20.2/warnings">5.20.2</a> <a class="dropdown-item" href="/5.20.1/warnings">5.20.1</a> <a class="dropdown-item" href="/5.20.0/warnings">5.20.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.18.4/warnings">5.18.4</a> <a class="dropdown-item" href="/5.18.3/warnings">5.18.3</a> <a class="dropdown-item active" href="/5.18.2/warnings">5.18.2</a> <a class="dropdown-item" href="/5.18.1/warnings">5.18.1</a> <a class="dropdown-item" href="/5.18.0/warnings">5.18.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.16.3/warnings">5.16.3</a> <a class="dropdown-item" href="/5.16.2/warnings">5.16.2</a> <a class="dropdown-item" href="/5.16.1/warnings">5.16.1</a> <a class="dropdown-item" href="/5.16.0/warnings">5.16.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.14.4/warnings">5.14.4</a> <a class="dropdown-item" href="/5.14.3/warnings">5.14.3</a> <a class="dropdown-item" href="/5.14.2/warnings">5.14.2</a> <a class="dropdown-item" href="/5.14.1/warnings">5.14.1</a> <a class="dropdown-item" href="/5.14.0/warnings">5.14.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.12.5/warnings">5.12.5</a> <a class="dropdown-item" href="/5.12.4/warnings">5.12.4</a> <a class="dropdown-item" href="/5.12.3/warnings">5.12.3</a> <a class="dropdown-item" href="/5.12.2/warnings">5.12.2</a> <a class="dropdown-item" href="/5.12.1/warnings">5.12.1</a> <a class="dropdown-item" href="/5.12.0/warnings">5.12.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.10.1/warnings">5.10.1</a> <a class="dropdown-item" href="/5.10.0/warnings">5.10.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.8.9/warnings">5.8.9</a> <a class="dropdown-item" href="/5.8.8/warnings">5.8.8</a> <a class="dropdown-item" href="/5.8.7/warnings">5.8.7</a> <a class="dropdown-item" href="/5.8.6/warnings">5.8.6</a> <a class="dropdown-item" href="/5.8.5/warnings">5.8.5</a> <a class="dropdown-item" href="/5.8.4/warnings">5.8.4</a> <a class="dropdown-item" href="/5.8.3/warnings">5.8.3</a> <a class="dropdown-item" href="/5.8.2/warnings">5.8.2</a> <a class="dropdown-item" href="/5.8.1/warnings">5.8.1</a> <a class="dropdown-item" href="/5.8.0/warnings">5.8.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.6.2/warnings">5.6.2</a> <a class="dropdown-item" href="/5.6.1/warnings">5.6.1</a> <a class="dropdown-item" href="/5.6.0/warnings">5.6.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.005_04/warnings">5.005_04</a> <a class="dropdown-item" href="/5.005_03/warnings">5.005_03</a> <a class="dropdown-item" href="/5.005_02/warnings">5.005_02</a> <a class="dropdown-item" href="/5.005_01/warnings">5.005_01</a> <a class="dropdown-item" href="/5.005/warnings">5.005</a> </div> </li> <li class="nav-item dropdown text-nowrap"> <a class="nav-link dropdown-toggle" href="#" id="dropdownlink-dev" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dev</a> <div class="dropdown-menu" aria-labelledby="dropdownlink-dev"> <a class="dropdown-item" href="/blead/warnings">blead</a> <a class="dropdown-item" href="/5.41.9/warnings">5.41.9</a> <a class="dropdown-item" href="/5.41.8/warnings">5.41.8</a> <a class="dropdown-item" href="/5.41.7/warnings">5.41.7</a> <a class="dropdown-item" href="/5.41.6/warnings">5.41.6</a> <a class="dropdown-item" href="/5.41.5/warnings">5.41.5</a> <a class="dropdown-item" href="/5.41.4/warnings">5.41.4</a> <a class="dropdown-item" href="/5.41.3/warnings">5.41.3</a> <a class="dropdown-item" href="/5.41.2/warnings">5.41.2</a> <a class="dropdown-item" href="/5.41.1/warnings">5.41.1</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.40.1-RC1/warnings">5.40.1-RC1</a> <a class="dropdown-item" href="/5.40.0-RC2/warnings">5.40.0-RC2</a> <a class="dropdown-item" href="/5.40.0-RC1/warnings">5.40.0-RC1</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.39.10/warnings">5.39.10</a> <a class="dropdown-item" href="/5.39.9/warnings">5.39.9</a> <a class="dropdown-item" href="/5.39.8/warnings">5.39.8</a> <a class="dropdown-item" href="/5.39.7/warnings">5.39.7</a> <a class="dropdown-item" href="/5.39.6/warnings">5.39.6</a> <a class="dropdown-item" href="/5.39.5/warnings">5.39.5</a> <a class="dropdown-item" href="/5.39.4/warnings">5.39.4</a> <a class="dropdown-item" href="/5.39.3/warnings">5.39.3</a> <a class="dropdown-item" href="/5.39.2/warnings">5.39.2</a> <a class="dropdown-item" href="/5.39.1/warnings">5.39.1</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.38.3-RC1/warnings">5.38.3-RC1</a> </div> </li> <li class="nav-item dropdown text-nowrap"> <a class="nav-link dropdown-toggle" href="#" id="dropdownlink-nav" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Documentation</a> <div class="dropdown-menu" aria-labelledby="dropdownlink-nav"> <a class="dropdown-item" href="/5.18.2/perl">Perl</a> <a class="dropdown-item" href="/5.18.2/perlintro">Intro</a> <a class="dropdown-item" href="/5.18.2/perl#Tutorials">Tutorials</a> <a class="dropdown-item" href="/5.18.2/perlfaq">FAQs</a> <a class="dropdown-item" href="/5.18.2/perl#Reference-Manual">Reference</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.18.2/perlop">Operators</a> <a class="dropdown-item" href="/5.18.2/functions">Functions</a> <a class="dropdown-item" href="/5.18.2/variables">Variables</a> <a class="dropdown-item" href="/5.18.2/modules">Modules</a> <a class="dropdown-item" href="/5.18.2/perlutil">Utilities</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.18.2/perldelta">Release Notes</a> <a class="dropdown-item" href="/5.18.2/perlcommunity">Community</a> <a class="dropdown-item" href="/5.18.2/perlhist">History</a> </div> </li> </ul> <ul class="navbar-nav"> <script> function set_expand (expand) { var perldocdiv = document.getElementById('perldocdiv'); var width = window.getComputedStyle(perldocdiv).getPropertyValue('max-width'); var expanded = (width == '' || width == 'none') ? true : false; if (expand === null) { expand = !expanded; } if ((expand && !expanded) || (!expand && expanded)) { perldocdiv.style.setProperty('max-width', expand ? 'none' : '960px'); var button_classlist = document.getElementById('content-expand-button').classList; if (expand) { button_classlist.add('btn-light'); button_classlist.remove('btn-outline-light'); } else { button_classlist.add('btn-outline-light'); button_classlist.remove('btn-light'); } } return expand; } function toggle_expand () { var expand = set_expand(null); document.cookie = 'perldoc_expand=' + (expand ? 1 : 0) + '; path=/; expires=Tue, 19 Jan 2038 03:14:07 UTC'; } function read_expand () { return document.cookie.split(';').some(function (item) { return item.indexOf('perldoc_expand=1') >= 0 }); } if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', function () { if (read_expand()) { set_expand(true); } }); } else if (read_expand()) { set_expand(true); } </script> <button id="content-expand-button" type="button" class="btn btn-outline-light d-none d-lg-inline-block mr-4" onclick="toggle_expand()">Expand</button> </ul> <form class="form-inline" method="get" action="/5.18.2/search"> <input class="form-control mr-3" type="search" name="q" placeholder="Search" aria-label="Search" value=""> </form> </div> </nav> <div id="wrapperlicious" class="container-fluid"> <div id="perldocdiv"> <div id="links"> <a href="/5.18.2/warnings">warnings</a> <div id="more"> (<a href="/5.18.2/warnings.txt">source</a>, <a href="https://metacpan.org/pod/warnings">CPAN</a>) </div> <div id="moduleversion">version 1.18</div> </div> <div class="leading-notice"> You are viewing the version of this documentation from Perl 5.18.2. <a href="/warnings">View the latest version</a> </div> <h1><a id="toc">CONTENTS</a></h1> <ul> <li> <a class="text-decoration-none" href="#NAME">NAME</a> </li> <li> <a class="text-decoration-none" href="#SYNOPSIS">SYNOPSIS</a> </li> <li> <a class="text-decoration-none" href="#DESCRIPTION">DESCRIPTION</a> </li> </ul> <h1 id="NAME"><a class="permalink" href="#NAME">#</a>NAME</h1> <p>warnings - Perl pragma to control optional warnings</p> <h1 id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">#</a>SYNOPSIS</h1> <pre><code>use warnings; no warnings; use warnings "all"; no warnings "all"; use warnings::register; if (warnings::enabled()) { warnings::warn("some warning"); } if (warnings::enabled("void")) { warnings::warn("void", "some warning"); } if (warnings::enabled($object)) { warnings::warn($object, "some warning"); } warnings::warnif("some warning"); warnings::warnif("void", "some warning"); warnings::warnif($object, "some warning");</code></pre> <h1 id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">#</a>DESCRIPTION</h1> <p>The <code>warnings</code> pragma is a replacement for the command line flag <code>-w</code>, but the pragma is limited to the enclosing block, while the flag is global. See <a href="/5.18.2/perllexwarn">perllexwarn</a> for more information and the list of built-in warning categories.</p> <p>If no import list is supplied, all possible warnings are either enabled or disabled.</p> <p>A number of functions are provided to assist module authors.</p> <dl> <dt id="use-warnings::register"><a class="permalink" href="#use-warnings::register">#</a><a id="use"></a>use warnings::register</dt> <dd> <p>Creates a new warnings category with the same name as the package where the call to the pragma is used.</p> </dd> <dt id="warnings::enabled()"><a class="permalink" href="#warnings::enabled()">#</a><a id="warnings"></a><a id="warnings::enabled"></a>warnings::enabled()</dt> <dd> <p>Use the warnings category with the same name as the current package.</p> <p>Return TRUE if that warnings category is enabled in the calling module. Otherwise returns FALSE.</p> </dd> <dt id="warnings::enabled($category)"><a class="permalink" href="#warnings::enabled($category)">#</a><a id="warnings1"></a><a id="warnings::enabled-category"></a>warnings::enabled($category)</dt> <dd> <p>Return TRUE if the warnings category, <code>$category</code>, is enabled in the calling module. Otherwise returns FALSE.</p> </dd> <dt id="warnings::enabled($object)"><a class="permalink" href="#warnings::enabled($object)">#</a><a id="warnings2"></a><a id="warnings::enabled-object"></a>warnings::enabled($object)</dt> <dd> <p>Use the name of the class for the object reference, <code>$object</code>, as the warnings category.</p> <p>Return TRUE if that warnings category is enabled in the first scope where the object is used. Otherwise returns FALSE.</p> </dd> <dt id="warnings::fatal_enabled()"><a class="permalink" href="#warnings::fatal_enabled()">#</a><a id="warnings3"></a><a id="warnings::fatal_enabled"></a>warnings::fatal_enabled()</dt> <dd> <p>Return TRUE if the warnings category with the same name as the current package has been set to FATAL in the calling module. Otherwise returns FALSE.</p> </dd> <dt id="warnings::fatal_enabled($category)"><a class="permalink" href="#warnings::fatal_enabled($category)">#</a><a id="warnings4"></a><a id="warnings::fatal_enabled-category"></a>warnings::fatal_enabled($category)</dt> <dd> <p>Return TRUE if the warnings category <code>$category</code> has been set to FATAL in the calling module. Otherwise returns FALSE.</p> </dd> <dt id="warnings::fatal_enabled($object)"><a class="permalink" href="#warnings::fatal_enabled($object)">#</a><a id="warnings5"></a><a id="warnings::fatal_enabled-object"></a>warnings::fatal_enabled($object)</dt> <dd> <p>Use the name of the class for the object reference, <code>$object</code>, as the warnings category.</p> <p>Return TRUE if that warnings category has been set to FATAL in the first scope where the object is used. Otherwise returns FALSE.</p> </dd> <dt id="warnings::warn($message)"><a class="permalink" href="#warnings::warn($message)">#</a><a id="warnings6"></a><a id="warnings::warn-message"></a>warnings::warn($message)</dt> <dd> <p>Print <code>$message</code> to STDERR.</p> <p>Use the warnings category with the same name as the current package.</p> <p>If that warnings category has been set to "FATAL" in the calling module then die. Otherwise return.</p> </dd> <dt id="warnings::warn($category,-$message)"><a class="permalink" href="#warnings::warn($category,-$message)">#</a><a id="warnings7"></a><a id="warnings::warn-category-message"></a>warnings::warn($category, $message)</dt> <dd> <p>Print <code>$message</code> to STDERR.</p> <p>If the warnings category, <code>$category</code>, has been set to "FATAL" in the calling module then die. Otherwise return.</p> </dd> <dt id="warnings::warn($object,-$message)"><a class="permalink" href="#warnings::warn($object,-$message)">#</a><a id="warnings8"></a><a id="warnings::warn-object-message"></a>warnings::warn($object, $message)</dt> <dd> <p>Print <code>$message</code> to STDERR.</p> <p>Use the name of the class for the object reference, <code>$object</code>, as the warnings category.</p> <p>If that warnings category has been set to "FATAL" in the scope where <code>$object</code> is first used then die. Otherwise return.</p> </dd> <dt id="warnings::warnif($message)"><a class="permalink" href="#warnings::warnif($message)">#</a><a id="warnings9"></a><a id="warnings::warnif-message"></a>warnings::warnif($message)</dt> <dd> <p>Equivalent to:</p> <pre><code>if (warnings::enabled()) { warnings::warn($message) }</code></pre> </dd> <dt id="warnings::warnif($category,-$message)"><a class="permalink" href="#warnings::warnif($category,-$message)">#</a><a id="warnings10"></a><a id="warnings::warnif-category-message"></a>warnings::warnif($category, $message)</dt> <dd> <p>Equivalent to:</p> <pre><code>if (warnings::enabled($category)) { warnings::warn($category, $message) }</code></pre> </dd> <dt id="warnings::warnif($object,-$message)"><a class="permalink" href="#warnings::warnif($object,-$message)">#</a><a id="warnings11"></a><a id="warnings::warnif-object-message"></a>warnings::warnif($object, $message)</dt> <dd> <p>Equivalent to:</p> <pre><code>if (warnings::enabled($object)) { warnings::warn($object, $message) }</code></pre> </dd> <dt id="warnings::register_categories(@names)"><a class="permalink" href="#warnings::register_categories(@names)">#</a><a id="warnings12"></a><a id="warnings::register_categories-names"></a>warnings::register_categories(@names)</dt> <dd> <p>This registers warning categories for the given names and is primarily for use by the warnings::register pragma, for which see <a href="/5.18.2/perllexwarn">perllexwarn</a>.</p> </dd> </dl> <p>See <a href="/5.18.2/perlmodlib#Pragmatic-Modules">"Pragmatic Modules" in perlmodlib</a> and <a href="/5.18.2/perllexwarn">perllexwarn</a>.</p> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). Please contact him via the <a href="https://github.com/Grinnz/perldoc-browser/issues">GitHub issue tracker</a> or <a href="mailto:dbook@cpan.org">email</a> regarding any issues with the site itself, search, or rendering of documentation.</p> <p>The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via the <a href="https://github.com/Perl/perl5/issues">Perl issue tracker</a>, the <a href="https://lists.perl.org/list/perl5-porters.html">mailing list</a>, or <a href="https://kiwiirc.com/client/irc.perl.org/p5p">IRC</a> to report any issues with the contents or format of the documentation.</p> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js" integrity="sha512-/DXTXr6nQodMUiq+IUJYCt2PPOUjrHJ9wFrqpJ3XkgPNOZVfMok7cRw6CSxyCQxXn6ozlESsSh1/sMCTF1rL/g==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.1/umd/popper.min.js" integrity="sha512-ubuT8Z88WxezgSqf3RLuNi5lmjstiJcyezx34yIU2gAHonIi27Na7atqzUZCOoY4CExaoFumzOsFQ2Ch+I/HCw==" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script> <script src="/js/highlight.pack.js"></script> <script>hljs.highlightAll();</script> </body> </html>