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<reference xml:id="class.closure" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">

<title>The Closure class</title>

<titleabbrev>Closure</titleabbrev>

<partintro>

<!-- {{{ Closure intro -->

<section xml:id="closure.intro">

&reftitle.intro;

<para>

Class used to represent <link linkend="functions.anonymous">anonymous

functions</link>.

</para>

<para>

Anonymous functions yield objects of this type.

This class has methods that allow

further control of the anonymous function after it has been created.

</para>

<para>

Besides the methods listed here, this class also has an

<literal>__invoke</literal> method. This is for consistency with other

classes that implement <link linkend="language.oop5.magic.invoke">calling

magic</link>, as this method is not used for calling the function.

</para>

</section>

<!-- }}} -->

<section xml:id="closure.synopsis">

&reftitle.classsynopsis;

<!-- {{{ Synopsis -->

<classsynopsis class="class">

<ooclass>

<modifier>final</modifier>

<classname>Closure</classname>

</ooclass>

<classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>

<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.closure')/db:refentry/db:refsect1[@role='description']/descendant::db:constructorsynopsis[@role='Closure'])">

<xi:fallback/>

</xi:include>

<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.closure')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[@role='Closure'])">

<xi:fallback/>

</xi:include>

</classsynopsis>

<!-- }}} -->

</section>

<section role="changelog">

&reftitle.changelog;

<informaltable>

<tgroup cols="2">

<thead>

<row>

<entry>&Version;</entry>

<entry>&Description;</entry>

</row>

</thead>

<tbody>

<row>

<entry>8.4.0</entry>

<entry>

The output of <methodname>Closure::__debugInfo</methodname> now includes the

name, line, and file of the closure.

</entry>

</row>

</tbody>

</tgroup>

</informaltable>

</section>

<section role="notes">

&reftitle.notes;

<note>

<simpara>

<classname>Closure</classname> objects cannot be serialized

as closures may contain bound variables and a specific execution context.

Attempting to serialize a closure will throw an <exceptionname>Exception</exceptionname>.

</simpara>

</note>

</section>

</partintro>

&language.predefined.closure.construct;

&language.predefined.closure.bind;

&language.predefined.closure.bindto;

&language.predefined.closure.call;

&language.predefined.closure.fromcallable;

&language.predefined.closure.getcurrent;

</reference>

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