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UNIVERSAL - base class for ALL classes (blessed references) - Perldoc Browser
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If it does then a reference to the sub is returned. If it does not then <i>undef</i> is returned.</p> <p><code>can</code> can be called as either a static or object method call.</p> </dd> <dt id="VERSION-(-[-REQUIRE-]-)"><a class="permalink" href="#VERSION-(-%5B-REQUIRE-%5D-)">#</a><a id="VERSION"></a><a id="VERSION-REQUIRE"></a>VERSION ( [ REQUIRE ] )</dt> <dd> <p><code>VERSION</code> will return the value of the variable <code>$VERSION</code> in the package the object is blessed into. If <code>REQUIRE</code> is given then it will do a comparison and die if the package version is not greater than or equal to <code>REQUIRE</code>.</p> <p><code>VERSION</code> can be called as either a static or object method call.</p> </dd> </dl> <p>The <code>isa</code> and <code>can</code> methods can also be called as subroutines</p> <dl> <dt id="UNIVERSAL::isa-(-VAL,-TYPE-)"><a class="permalink" href="#UNIVERSAL::isa-(-VAL,-TYPE-)">#</a><a id="UNIVERSAL"></a><a id="UNIVERSAL::isa-VAL-TYPE"></a>UNIVERSAL::isa ( VAL, TYPE )</dt> <dd> <p><code>isa</code> returns <i>true</i> if the first argument is a reference and either of the following statements is true.</p> <ul> <li><p><code>VAL</code> is a blessed reference and is blessed into package <code>TYPE</code> or inherits from package <code>TYPE</code></p> </li> <li><p><code>VAL</code> is a reference to a <code>TYPE</code> of perl variable (er 'HASH')</p> </li> </ul> </dd> <dt id="UNIVERSAL::can-(-VAL,-METHOD-)"><a class="permalink" href="#UNIVERSAL::can-(-VAL,-METHOD-)">#</a><a id="UNIVERSAL1"></a><a id="UNIVERSAL::can-VAL-METHOD"></a>UNIVERSAL::can ( VAL, METHOD )</dt> <dd> <p>If <code>VAL</code> is a blessed reference which has a method called <code>METHOD</code>, <code>can</code> returns a reference to the subroutine. If <code>VAL</code> is not a blessed reference, or if it does not have a method <code>METHOD</code>, <i>undef</i> is returned.</p> </dd> </dl> <p>These subroutines should <i>not</i> be imported via <span style="white-space: nowrap;"><code>use UNIVERSAL qw(...)</code></span>. If you want simple local access to them you can do</p> <pre><code>*isa = \&UNIVERSAL::isa;</code></pre> <p>to import isa into your package.</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. 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