base - Establish an ISA relationship with base classes at compile time

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>2.0 (MSCHWERN on 2003-08-28)</option> </optgroup> </select> <a data-keyboard-shortcut="g d" class="release-name" href="/dist/base">base-2.23</a> </div> <span class="river-gauge-gauge"> <svg width="24px" height="15px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <g> <title> River stage five 
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 • 24803 total dependents </title> <rect x="0" y="0" width="4" height="15" fill="#7ea3f2" /> <rect x="5" y="0" width="4" height="15" fill="#7ea3f2" /> <rect x="10" y="0" width="4" height="15" fill="#7ea3f2" /> <rect x="15" y="0" width="4" height="15" fill="#7ea3f2" /> <rect x="20" y="0" width="4" height="15" fill="#7ea3f2" /> </g> </svg> </span> <div id="base-fav" class="show-logged-in"> <form action="/account/favorite/add" style="display: inline" method="POST"> <input type="hidden" name="remove" value="0"> <input type="hidden" name="release" value="base-2.23"> <input type="hidden" name="author" value="RJBS"> <input type="hidden" name="distribution" value="base"> <button type="submit" class="favorite highlight"><span>2</span> ++</button> </form> </div> <div class="show-logged-out"> <button class="fav-not-logged-in favorite highlight"><span>2</span> ++</button> </div> / <span>base</span> </div> </div> <main class="content"> <nav class="toc"> <div class="toc-header"><strong>Contents</strong></div> <ul> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#DIAGNOSTICS">DIAGNOSTICS</a></li> <li><a href="#HISTORY">HISTORY</a></li> <li><a href="#CAVEATS">CAVEATS</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> </ul></nav> <div class="pod anchors"> <h1 id="NAME">NAME</h1> <p>base - Establish an ISA relationship with base classes at compile time</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code>package Baz; use base qw(Foo Bar);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>Unless you are using the <code>fields</code> pragma, consider this module discouraged in favor of the lighter-weight <code>parent</code>.</p> <p>Allows you to both load one or more modules, while setting up inheritance from those modules at the same time. Roughly similar in effect to</p> <pre><code>package Baz; BEGIN { require Foo; require Bar; push @ISA, qw(Foo Bar); }</code></pre> <p>When <code>base</code> tries to <code>require</code> a module, it will not die if it cannot find the module's file, but will die on any other error. After all this, should your base class be empty, containing no symbols, <code>base</code> will die. This is useful for inheriting from classes in the same file as yourself but where the filename does not match the base module name, like so:</p> <pre><code># in Bar.pm package Foo; sub exclaim { "I can have such a thing?!" } package Bar; use base "Foo";</code></pre> <p>There is no <i>Foo.pm</i>, but because <code>Foo</code> defines a symbol (the <code>exclaim</code> subroutine), <code>base</code> will not die when the <code>require</code> fails to load <i>Foo.pm</i>.</p> <p><code>base</code> will also initialize the fields if one of the base classes has it. Multiple inheritance of fields is <b>NOT</b> supported, if two or more base classes each have inheritable fields the 'base' pragma will croak. See <a href="/pod/fields">fields</a> for a description of this feature.</p> <p>The base class' <code>import</code> method is <b>not</b> called.</p> <h1 id="DIAGNOSTICS">DIAGNOSTICS</h1> <dl> <dt id="Base-class-package-"%s"-is-empty."><a id="Base"></a><a id="Base-class-package-s-is-empty"></a>Base class package "%s" is empty.</dt> <dd> <p>base.pm was unable to require the base package, because it was not found in your path.</p> </dd> <dt id="Class-'Foo'-tried-to-inherit-from-itself"><a id="Class"></a><a id="Class-Foo-tried-to-inherit-from-itself"></a>Class 'Foo' tried to inherit from itself</dt> <dd> <p>Attempting to inherit from yourself generates a warning.</p> <pre><code>package Foo; use base 'Foo';</code></pre> </dd> </dl> <h1 id="HISTORY">HISTORY</h1> <p>This module was introduced with Perl 5.004_04.</p> <h1 id="CAVEATS">CAVEATS</h1> <p>Due to the limitations of the implementation, you must use base <i>before</i> you declare any of your own fields.</p> <h1 id="SEE-ALSO"><a id="SEE"></a>SEE ALSO</h1> <p><a href="/pod/fields">fields</a></p></div> <div id="metacpan_install-instructions-dialog" class="modal fade"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button> <h4 class="modal-title">Module Install Instructions</h4> </div> <div class="modal-body"> <p>To install base, copy and paste the appropriate command in to your terminal.</p> <p><a href="/dist/App-cpanminus/view/bin/cpanm">cpanm</a></p> <pre><code>cpanm base</code></pre> <p><a href="/pod/CPAN">CPAN shell</a></p> <pre><code>perl -MCPAN -e shell install base</code></pre> <p>For more information on module installation, please visit <a href="https://www.cpan.org/modules/INSTALL.html">the detailed CPAN module installation guide</a>.</p> </div> <div class="modal-footer"> <a href="#" data-dismiss="modal" class="btn">Close</a> </div> </div> </div> </div> </main> <div 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