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<a class="el" href="namespaceGio.html">Gio</a>::<a class="el" href="classGio_1_1Cancellable.html">Cancellable</a></div>
<h1>Gio::Cancellable Class Reference</h1><!-- doxytag: class="Gio::Cancellable" --><!-- doxytag: inherits="Glib::Object" -->Allows actions to be cancelled.  
<a href="#_details">More...</a>
<p>
<div class="dynheader">
Inheritance diagram for Gio::Cancellable:</div>
<div class="dynsection">
<p><center><img src="classGio_1_1Cancellable__inherit__graph.png" border="0" usemap="#Gio_1_1Cancellable__inherit__map" alt="Inheritance graph"></center>
<map name="Gio_1_1Cancellable__inherit__map">
<area shape="rect" href="classGlib_1_1Object.html" title="Glib::Object" alt="" coords="21,161,115,188"><area shape="rect" href="classGlib_1_1ObjectBase.html" title="Glib::ObjectBase is a common base class for Objects and Interfaces." alt="" coords="5,84,131,111"><area shape="rect" href="classsigc_1_1trackable.html" title="sigc::trackable" alt="" coords="12,7,124,33"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>

<p>
<a href="classGio_1_1Cancellable-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#97c7c4d728865129bc6f0cd3f4ecfce7">~Cancellable</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">GCancellable*&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#e19ec1e85fd9cd7893914d4d7c20120d">gobj</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Provides access to the underlying C GObject.  <a href="#e19ec1e85fd9cd7893914d4d7c20120d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const GCancellable*&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#668176a01f7ad3cc13c7448378f37b41">gobj</a> () const </td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Provides access to the underlying C GObject.  <a href="#668176a01f7ad3cc13c7448378f37b41"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">GCancellable*&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#379e6394bad0fff1eb11e1a160f30235">gobj_copy</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.  <a href="#379e6394bad0fff1eb11e1a160f30235"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#47ce5f2f16541b7ae18bc5114b366d8c">is_cancelled</a> () const </td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Checks if a cancellable job has been cancelled.  <a href="#47ce5f2f16541b7ae18bc5114b366d8c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#80df23049daf594fda884f2932ce3b95">get_fd</a> () const </td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Gets the file descriptor for a cancellable job.  <a href="#80df23049daf594fda884f2932ce3b95"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#86adae0645cec20d09d1a2903fe46cc0">cancel</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Will set <em>cancellable</em> to cancelled, and will emit the CANCELLED signal.  <a href="#86adae0645cec20d09d1a2903fe46cc0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#d893da5aebfb4baf34ecdbdad7a3608b">push_current</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Pushes <em>cancellable</em> onto the cancellable stack.  <a href="#d893da5aebfb4baf34ecdbdad7a3608b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#93b5a39447d2b4eb9fb56748cb687fc8">pop_current</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Pops <em>cancellable</em> off the cancellable stack (verifying that <em>cancellable</em> is on the top of the stack).  <a href="#93b5a39447d2b4eb9fb56748cb687fc8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#2285370aea5d98141e742e73743b9c3e">reset</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Resets <em>cancellable</em> to its uncancelled state.  <a href="#2285370aea5d98141e742e73743b9c3e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classGlib_1_1SignalProxy0.html">Glib::SignalProxy0</a><br>
&lt;void&gt;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#5a34d4782ccec014684c4eb6c20cf0a6">signal_cancelled</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight"><dl class="user" compact><dt><b>Prototype:</b></dt><dd><code>void on_my_cancelled()</code> </dd></dl>
 <a href="#5a34d4782ccec014684c4eb6c20cf0a6"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a><br>
&lt;<a class="el" href="classGio_1_1Cancellable.html">Cancellable</a>&gt;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#8d59324b4c253f8c890901cd934203a7">create</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a><br>
&lt;<a class="el" href="classGio_1_1Cancellable.html">Cancellable</a>&gt;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#af923ce91ddf21fc03bf2902e12cd4e1">get_current</a> ()</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Gets the top cancellable from the stack.  <a href="#af923ce91ddf21fc03bf2902e12cd4e1"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#ab7733b6e915e4ebe280fbb669b6af2a">Cancellable</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#ff017e200824997b9c26d82f147e078f">on_cancelled</a> ()</td></tr>

<tr><td colspan="2"><br><h2>Related Functions</h2></td></tr>
<tr><td colspan="2">(Note that these are not member functions.) <br><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a><br>
&lt;<a class="el" href="classGio_1_1Cancellable.html">Gio::Cancellable</a>&gt;&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classGio_1_1Cancellable.html#c45875da91c9c870a0f154a8249047c0">wrap</a> (GCancellable* object, bool take_copy=false)</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">A <a class="el" href="namespaceGlib.html#671306f4a3a0cae5ab4d7a9d54886592">Glib::wrap()</a> method for this object.  <a href="#c45875da91c9c870a0f154a8249047c0"></a><br></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Allows actions to be cancelled. 
<p>
<a class="el" href="classGio_1_1Cancellable.html" title="Allows actions to be cancelled.">Cancellable</a> is a thread-safe operation cancellation stack used throughout GIO to allow for cancellation of synchronous and asynchronous operations.<p>
<dl compact><dt><b><a class="el" href="newin2p16s.html#_newin2p16s000015">Since glibmm 2.16:</a></b></dt><dd></dd></dl>
<hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="97c7c4d728865129bc6f0cd3f4ecfce7"></a><!-- doxytag: member="Gio::Cancellable::~Cancellable" ref="97c7c4d728865129bc6f0cd3f4ecfce7" args="()" -->
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          <td class="memname">virtual Gio::Cancellable::~Cancellable           </td>
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          <td width="100%"><code> [virtual]</code></td>
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<p>

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<a class="anchor" name="ab7733b6e915e4ebe280fbb669b6af2a"></a><!-- doxytag: member="Gio::Cancellable::Cancellable" ref="ab7733b6e915e4ebe280fbb669b6af2a" args="()" -->
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          <td class="memname">Gio::Cancellable::Cancellable           </td>
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          <td width="100%"><code> [protected]</code></td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="e19ec1e85fd9cd7893914d4d7c20120d"></a><!-- doxytag: member="Gio::Cancellable::gobj" ref="e19ec1e85fd9cd7893914d4d7c20120d" args="()" -->
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          <td class="memname">GCancellable* Gio::Cancellable::gobj           </td>
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<p>
Provides access to the underlying C GObject. 
<p>

<p>Reimplemented from <a class="el" href="classGlib_1_1ObjectBase.html#4c6efc18be8cb9c56e58fc0bd20fafbe">Glib::ObjectBase</a>.</p>

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<a class="anchor" name="668176a01f7ad3cc13c7448378f37b41"></a><!-- doxytag: member="Gio::Cancellable::gobj" ref="668176a01f7ad3cc13c7448378f37b41" args="() const " -->
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          <td class="memname">const GCancellable* Gio::Cancellable::gobj           </td>
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<p>
Provides access to the underlying C GObject. 
<p>

<p>Reimplemented from <a class="el" href="classGlib_1_1ObjectBase.html#778a94181132976bbfb0519793f3b32e">Glib::ObjectBase</a>.</p>

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<a class="anchor" name="379e6394bad0fff1eb11e1a160f30235"></a><!-- doxytag: member="Gio::Cancellable::gobj_copy" ref="379e6394bad0fff1eb11e1a160f30235" args="()" -->
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          <td class="memname">GCancellable* Gio::Cancellable::gobj_copy           </td>
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<p>
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. 
<p>

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<a class="anchor" name="8d59324b4c253f8c890901cd934203a7"></a><!-- doxytag: member="Gio::Cancellable::create" ref="8d59324b4c253f8c890901cd934203a7" args="()" -->
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          <td class="memname">static <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a>&lt;<a class="el" href="classGio_1_1Cancellable.html">Cancellable</a>&gt; Gio::Cancellable::create           </td>
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<a class="anchor" name="47ce5f2f16541b7ae18bc5114b366d8c"></a><!-- doxytag: member="Gio::Cancellable::is_cancelled" ref="47ce5f2f16541b7ae18bc5114b366d8c" args="() const " -->
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<p>
Checks if a cancellable job has been cancelled. 
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd><code>true</code> if <em>cancellable</em> is cancelled, <code>false</code> if called with <code>0</code> or if item is not cancelled. </dd></dl>

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<a class="anchor" name="80df23049daf594fda884f2932ce3b95"></a><!-- doxytag: member="Gio::Cancellable::get_fd" ref="80df23049daf594fda884f2932ce3b95" args="() const " -->
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<p>
Gets the file descriptor for a cancellable job. 
<p>
This can be used to implement cancellable operations on Unix systems. The returned fd will turn readable when <em>cancellable</em> is cancelled. <dl class="return" compact><dt><b>Returns:</b></dt><dd>A valid file descriptor. -1 if the file descriptor is not supported, or on errors. </dd></dl>

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<a class="anchor" name="86adae0645cec20d09d1a2903fe46cc0"></a><!-- doxytag: member="Gio::Cancellable::cancel" ref="86adae0645cec20d09d1a2903fe46cc0" args="()" -->
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<p>
Will set <em>cancellable</em> to cancelled, and will emit the CANCELLED signal. 
<p>
This function is thread-safe. In other words, you can safely call it from another thread than the one running an operation that was passed the <em>cancellable</em>. 
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<a class="anchor" name="af923ce91ddf21fc03bf2902e12cd4e1"></a><!-- doxytag: member="Gio::Cancellable::get_current" ref="af923ce91ddf21fc03bf2902e12cd4e1" args="()" -->
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          <td class="memname">static <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a>&lt;<a class="el" href="classGio_1_1Cancellable.html">Cancellable</a>&gt; Gio::Cancellable::get_current           </td>
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<p>
Gets the top cancellable from the stack. 
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>A <a class="el" href="classGio_1_1Cancellable.html" title="Allows actions to be cancelled.">Cancellable</a> from the top of the stack, or <code>0</code> if the stack is empty. </dd></dl>

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<a class="anchor" name="d893da5aebfb4baf34ecdbdad7a3608b"></a><!-- doxytag: member="Gio::Cancellable::push_current" ref="d893da5aebfb4baf34ecdbdad7a3608b" args="()" -->
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<p>
Pushes <em>cancellable</em> onto the cancellable stack. 
<p>
The current cancllable can then be recieved using g_cancellable_get_current().<p>
This is useful when implementing cancellable operations in code that does not allow you to pass down the cancellable object.<p>
This is typically called automatically by e.g. <a class="el" href="classGio_1_1File.html" title="File and directory handling.">File</a> operations, so you rarely have to call this yourself. 
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<a class="anchor" name="93b5a39447d2b4eb9fb56748cb687fc8"></a><!-- doxytag: member="Gio::Cancellable::pop_current" ref="93b5a39447d2b4eb9fb56748cb687fc8" args="()" -->
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Pops <em>cancellable</em> off the cancellable stack (verifying that <em>cancellable</em> is on the top of the stack). 
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<a class="anchor" name="2285370aea5d98141e742e73743b9c3e"></a><!-- doxytag: member="Gio::Cancellable::reset" ref="2285370aea5d98141e742e73743b9c3e" args="()" -->
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<p>
Resets <em>cancellable</em> to its uncancelled state. 
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<a class="anchor" name="5a34d4782ccec014684c4eb6c20cf0a6"></a><!-- doxytag: member="Gio::Cancellable::signal_cancelled" ref="5a34d4782ccec014684c4eb6c20cf0a6" args="()" -->
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          <td class="memname"><a class="el" href="classGlib_1_1SignalProxy0.html">Glib::SignalProxy0</a>&lt;void&gt; Gio::Cancellable::signal_cancelled           </td>
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<dl class="user" compact><dt><b>Prototype:</b></dt><dd><code>void on_my_cancelled()</code> </dd></dl>

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<a class="anchor" name="ff017e200824997b9c26d82f147e078f"></a><!-- doxytag: member="Gio::Cancellable::on_cancelled" ref="ff017e200824997b9c26d82f147e078f" args="()" -->
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          <td class="memname">virtual void Gio::Cancellable::on_cancelled           </td>
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          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [protected, virtual]</code></td>
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<hr><h2>Friends And Related Function Documentation</h2>
<a class="anchor" name="c45875da91c9c870a0f154a8249047c0"></a><!-- doxytag: member="Gio::Cancellable::wrap" ref="c45875da91c9c870a0f154a8249047c0" args="(GCancellable *object, bool take_copy=false)" -->
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          <td class="memname"><a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a>&lt;<a class="el" href="classGio_1_1Cancellable.html">Gio::Cancellable</a>&gt; wrap           </td>
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          <td class="paramtype">GCancellable *&nbsp;</td>
          <td class="paramname"> <em>object</em>, </td>
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          <td class="paramtype">bool&nbsp;</td>
          <td class="paramname"> <em>take_copy</em> = <code>false</code></td><td>&nbsp;</td>
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          <td></td><td></td><td width="100%"><code> [related]</code></td>
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A <a class="el" href="namespaceGlib.html#671306f4a3a0cae5ab4d7a9d54886592">Glib::wrap()</a> method for this object. 
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>object</em>&nbsp;</td><td>The C instance. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>take_copy</em>&nbsp;</td><td>False if the result should take ownership of the C instance. True if it should take a new copy or ref. </td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>A C++ instance that wraps this C instance. </dd></dl>

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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="cancellable_8h.html">cancellable.h</a></ul>
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