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<title>glibmm: Glib::RefPtr< T_CppObject > Class Template Reference</title>
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 <span id="projectnumber">2.42.0</span>
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<li class="navelem"><a class="el" href="namespaceGlib.html">Glib</a></li><li class="navelem"><a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">Glib::RefPtr< T_CppObject > Class Template Reference</div> </div>
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<p>RefPtr<> is a reference-counting shared smartpointer.
<a href="classGlib_1_1RefPtr.html#details">More...</a></p>
<p><code>#include <glibmm/refptr.h></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a8b6c39656dbc5d452933b35faf352f74"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a8b6c39656dbc5d452933b35faf352f74">RefPtr</a> ()</td></tr>
<tr class="memdesc:a8b6c39656dbc5d452933b35faf352f74"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <a href="#a8b6c39656dbc5d452933b35faf352f74">More...</a><br /></td></tr>
<tr class="separator:a8b6c39656dbc5d452933b35faf352f74"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a36b7fbe4a04bfe51f56b3c7062bb1316"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a36b7fbe4a04bfe51f56b3c7062bb1316">~RefPtr</a> ()</td></tr>
<tr class="memdesc:a36b7fbe4a04bfe51f56b3c7062bb1316"><td class="mdescLeft"> </td><td class="mdescRight">Destructor - decrements reference count. <a href="#a36b7fbe4a04bfe51f56b3c7062bb1316">More...</a><br /></td></tr>
<tr class="separator:a36b7fbe4a04bfe51f56b3c7062bb1316"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aca71e4ac99f37bf901ca3709a4bcf487"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#aca71e4ac99f37bf901ca3709a4bcf487">RefPtr</a> (T_CppObject* pCppObject)</td></tr>
<tr class="memdesc:aca71e4ac99f37bf901ca3709a4bcf487"><td class="mdescLeft"> </td><td class="mdescRight">For use only by the ::create() methods. <a href="#aca71e4ac99f37bf901ca3709a4bcf487">More...</a><br /></td></tr>
<tr class="separator:aca71e4ac99f37bf901ca3709a4bcf487"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abaf32caf7deadcabeec0fd7f95bd1d7f"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#abaf32caf7deadcabeec0fd7f95bd1d7f">RefPtr</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src)</td></tr>
<tr class="memdesc:abaf32caf7deadcabeec0fd7f95bd1d7f"><td class="mdescLeft"> </td><td class="mdescRight">Copy constructor. <a href="#abaf32caf7deadcabeec0fd7f95bd1d7f">More...</a><br /></td></tr>
<tr class="separator:abaf32caf7deadcabeec0fd7f95bd1d7f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5a8465a0045d0d7310acfc21ae318b6e"><td class="memTemplParams" colspan="2">template<class T_CastFrom > </td></tr>
<tr class="memitem:a5a8465a0045d0d7310acfc21ae318b6e"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a5a8465a0045d0d7310acfc21ae318b6e">RefPtr</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CastFrom >& src)</td></tr>
<tr class="memdesc:a5a8465a0045d0d7310acfc21ae318b6e"><td class="mdescLeft"> </td><td class="mdescRight">Copy constructor (from different, but castable type). <a href="#a5a8465a0045d0d7310acfc21ae318b6e">More...</a><br /></td></tr>
<tr class="separator:a5a8465a0045d0d7310acfc21ae318b6e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab54eb64fe0e872a0b88119107a5ba1f3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#ab54eb64fe0e872a0b88119107a5ba1f3">swap</a> (<a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& other)</td></tr>
<tr class="memdesc:ab54eb64fe0e872a0b88119107a5ba1f3"><td class="mdescLeft"> </td><td class="mdescRight">Swap the contents of two RefPtr<>. <a href="#ab54eb64fe0e872a0b88119107a5ba1f3">More...</a><br /></td></tr>
<tr class="separator:ab54eb64fe0e872a0b88119107a5ba1f3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a80ea91e3e0e0c460f941266980e14416"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a80ea91e3e0e0c460f941266980e14416">operator=</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src)</td></tr>
<tr class="memdesc:a80ea91e3e0e0c460f941266980e14416"><td class="mdescLeft"> </td><td class="mdescRight">Copy from another <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a>: <a href="#a80ea91e3e0e0c460f941266980e14416">More...</a><br /></td></tr>
<tr class="separator:a80ea91e3e0e0c460f941266980e14416"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9ea2f146765b25efa95b38d59a38f410"><td class="memTemplParams" colspan="2">template<class T_CastFrom > </td></tr>
<tr class="memitem:a9ea2f146765b25efa95b38d59a38f410"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a9ea2f146765b25efa95b38d59a38f410">operator=</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CastFrom >& src)</td></tr>
<tr class="memdesc:a9ea2f146765b25efa95b38d59a38f410"><td class="mdescLeft"> </td><td class="mdescRight">Copy from different, but castable type). <a href="#a9ea2f146765b25efa95b38d59a38f410">More...</a><br /></td></tr>
<tr class="separator:a9ea2f146765b25efa95b38d59a38f410"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a94830ac72b547040600ba157af592a93"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a94830ac72b547040600ba157af592a93">operator==</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src) const </td></tr>
<tr class="memdesc:a94830ac72b547040600ba157af592a93"><td class="mdescLeft"> </td><td class="mdescRight">Tests whether the RefPtr<> point to the same underlying instance. <a href="#a94830ac72b547040600ba157af592a93">More...</a><br /></td></tr>
<tr class="separator:a94830ac72b547040600ba157af592a93"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a18d79f08aeea24f8fdc6ed6f94c428fb"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a18d79f08aeea24f8fdc6ed6f94c428fb">operator!=</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src) const </td></tr>
<tr class="memdesc:a18d79f08aeea24f8fdc6ed6f94c428fb"><td class="mdescLeft"> </td><td class="mdescRight">See <a class="el" href="classGlib_1_1RefPtr.html#a94830ac72b547040600ba157af592a93" title="Tests whether the RefPtr<> point to the same underlying instance. ">operator==()</a>. <a href="#a18d79f08aeea24f8fdc6ed6f94c428fb">More...</a><br /></td></tr>
<tr class="separator:a18d79f08aeea24f8fdc6ed6f94c428fb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a62cd21eed81024435a6ec778e991365c"><td class="memItemLeft" align="right" valign="top">T_CppObject* </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a62cd21eed81024435a6ec778e991365c">operator-></a> () const </td></tr>
<tr class="memdesc:a62cd21eed81024435a6ec778e991365c"><td class="mdescLeft"> </td><td class="mdescRight">Dereferencing. <a href="#a62cd21eed81024435a6ec778e991365c">More...</a><br /></td></tr>
<tr class="separator:a62cd21eed81024435a6ec778e991365c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8a7604cb37dea79a1f3e4015621bce46"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a8a7604cb37dea79a1f3e4015621bce46">operator bool</a> () const </td></tr>
<tr class="memdesc:a8a7604cb37dea79a1f3e4015621bce46"><td class="mdescLeft"> </td><td class="mdescRight">Test whether the RefPtr<> points to any underlying instance. <a href="#a8a7604cb37dea79a1f3e4015621bce46">More...</a><br /></td></tr>
<tr class="separator:a8a7604cb37dea79a1f3e4015621bce46"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab7fb103f02d4a0fb21d7a8d0824047cc"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#ab7fb103f02d4a0fb21d7a8d0824047cc">clear</a> ()</td></tr>
<tr class="separator:ab7fb103f02d4a0fb21d7a8d0824047cc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abdcc38a6aeef7ae330c045eaf9324b71"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#abdcc38a6aeef7ae330c045eaf9324b71">reset</a> ()</td></tr>
<tr class="memdesc:abdcc38a6aeef7ae330c045eaf9324b71"><td class="mdescLeft"> </td><td class="mdescRight">Set underlying instance to 0, decrementing reference count of existing instance appropriately. <a href="#abdcc38a6aeef7ae330c045eaf9324b71">More...</a><br /></td></tr>
<tr class="separator:abdcc38a6aeef7ae330c045eaf9324b71"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5ea9b5eed0b4169b85f0c46f5ee0378c"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c">operator<</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src) const </td></tr>
<tr class="memdesc:a5ea9b5eed0b4169b85f0c46f5ee0378c"><td class="mdescLeft"> </td><td class="mdescRight">Compare based on the underlying instance address. <a href="#a5ea9b5eed0b4169b85f0c46f5ee0378c">More...</a><br /></td></tr>
<tr class="separator:a5ea9b5eed0b4169b85f0c46f5ee0378c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4120ad849d5fc65b4cbff8ee1aed06e5"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a4120ad849d5fc65b4cbff8ee1aed06e5">operator<=</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src) const </td></tr>
<tr class="memdesc:a4120ad849d5fc65b4cbff8ee1aed06e5"><td class="mdescLeft"> </td><td class="mdescRight">See <a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c" title="Compare based on the underlying instance address. ">operator<()</a>. <a href="#a4120ad849d5fc65b4cbff8ee1aed06e5">More...</a><br /></td></tr>
<tr class="separator:a4120ad849d5fc65b4cbff8ee1aed06e5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8cc2e82247955778cf663c9f5a9ece0a"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a8cc2e82247955778cf663c9f5a9ece0a">operator></a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src) const </td></tr>
<tr class="memdesc:a8cc2e82247955778cf663c9f5a9ece0a"><td class="mdescLeft"> </td><td class="mdescRight">See <a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c" title="Compare based on the underlying instance address. ">operator<()</a>. <a href="#a8cc2e82247955778cf663c9f5a9ece0a">More...</a><br /></td></tr>
<tr class="separator:a8cc2e82247955778cf663c9f5a9ece0a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a722711d362140718fd745f36124f9e75"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a722711d362140718fd745f36124f9e75">operator>=</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& src) const </td></tr>
<tr class="memdesc:a722711d362140718fd745f36124f9e75"><td class="mdescLeft"> </td><td class="mdescRight">See <a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c" title="Compare based on the underlying instance address. ">operator<()</a>. <a href="#a722711d362140718fd745f36124f9e75">More...</a><br /></td></tr>
<tr class="separator:a722711d362140718fd745f36124f9e75"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:a07c06c5c305e65d6149a139c462a78d1"><td class="memTemplParams" colspan="2">template<class T_CastFrom > </td></tr>
<tr class="memitem:a07c06c5c305e65d6149a139c462a78d1"><td class="memTemplItemLeft" align="right" valign="top">static <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a07c06c5c305e65d6149a139c462a78d1">cast_dynamic</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CastFrom >& src)</td></tr>
<tr class="memdesc:a07c06c5c305e65d6149a139c462a78d1"><td class="mdescLeft"> </td><td class="mdescRight">Dynamic cast to derived class. <a href="#a07c06c5c305e65d6149a139c462a78d1">More...</a><br /></td></tr>
<tr class="separator:a07c06c5c305e65d6149a139c462a78d1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2930d8c0eaa2610ee58cd267d325cc6e"><td class="memTemplParams" colspan="2">template<class T_CastFrom > </td></tr>
<tr class="memitem:a2930d8c0eaa2610ee58cd267d325cc6e"><td class="memTemplItemLeft" align="right" valign="top">static <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a2930d8c0eaa2610ee58cd267d325cc6e">cast_static</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CastFrom >& src)</td></tr>
<tr class="memdesc:a2930d8c0eaa2610ee58cd267d325cc6e"><td class="mdescLeft"> </td><td class="mdescRight">Static cast to derived class. <a href="#a2930d8c0eaa2610ee58cd267d325cc6e">More...</a><br /></td></tr>
<tr class="separator:a2930d8c0eaa2610ee58cd267d325cc6e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2162d6e2813b95c19866f6a03b0c9154"><td class="memTemplParams" colspan="2">template<class T_CastFrom > </td></tr>
<tr class="memitem:a2162d6e2813b95c19866f6a03b0c9154"><td class="memTemplItemLeft" align="right" valign="top">static <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject > </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a2162d6e2813b95c19866f6a03b0c9154">cast_const</a> (const <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CastFrom >& src)</td></tr>
<tr class="memdesc:a2162d6e2813b95c19866f6a03b0c9154"><td class="mdescLeft"> </td><td class="mdescRight">Cast to non-const. <a href="#a2162d6e2813b95c19866f6a03b0c9154">More...</a><br /></td></tr>
<tr class="separator:a2162d6e2813b95c19866f6a03b0c9154"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="related"></a>
Related Functions</h2></td></tr>
<tr><td class="ititle" colspan="2"><p>(Note that these are not member functions.) </p>
</td></tr>
<tr class="memitem:a5d6b2cc2157904a53cab15d4e9b96524"><td class="memTemplParams" colspan="2">template<class T_CppObject > </td></tr>
<tr class="memitem:a5d6b2cc2157904a53cab15d4e9b96524"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classGlib_1_1RefPtr.html#a5d6b2cc2157904a53cab15d4e9b96524">swap</a> (<a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& lhs, <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a>< T_CppObject >& rhs)</td></tr>
<tr class="separator:a5d6b2cc2157904a53cab15d4e9b96524"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<class T_CppObject><br />
class Glib::RefPtr< T_CppObject ></h3>
<p>RefPtr<> is a reference-counting shared smartpointer. </p>
<p>Some objects in gtkmm are obtained from a shared store. Consequently you cannot instantiate them yourself. Instead they return a <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a> which behaves much like an ordinary pointer in that members can be reached with the usual <code>object_ptr->member</code> notation. Unlike most other smart pointers, <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a> doesn't support dereferencing through <code>* object_ptr</code>.</p>
<p>Reference counting means that a shared reference count is incremented each time a <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a> is copied, and decremented each time a <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a> is destroyed, for instance when it leaves its scope. When the reference count reaches zero, the contained object is deleted, meaning you don't need to remember to delete the object.</p>
<p>RefPtr<> can store any class that has reference() and unreference() methods. In gtkmm, that is anything derived from <a class="el" href="classGlib_1_1ObjectBase.html" title="Glib::ObjectBase is a common base class for Objects and Interfaces. ">Glib::ObjectBase</a>, such as Gdk::Pixmap.</p>
<p>See the "Memory Management" section in the "Programming with gtkmm" book for further information. </p>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="thread_2dispatcher_8cc-example.html#_a5">thread/dispatcher.cc</a>.</dd>
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<p>Default constructor. </p>
<p>Afterwards it will be null and use of -> will cause a segmentation fault. </p>
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<p>Destructor - decrements reference count. </p>
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<p>For use only by the ::create() methods. </p>
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<p>Copy constructor. </p>
<p>This increments the shared reference count. </p>
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<p>Copy constructor (from different, but castable type). </p>
<p>Increments the reference count. </p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<p>Cast to non-const. </p>
<p>The <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a> can't be cast with the usual notation so instead you can use </p><div class="fragment"><div class="line">ptr_unconst = <a class="code" href="classGlib_1_1RefPtr.html#a2162d6e2813b95c19866f6a03b0c9154">RefPtr<UnConstType>::cast_const</a>(ptr_const);</div>
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<p>Dynamic cast to derived class. </p>
<p>The <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a> can't be cast with the usual notation so instead you can use </p><div class="fragment"><div class="line">ptr_derived = <a class="code" href="classGlib_1_1RefPtr.html#a07c06c5c305e65d6149a139c462a78d1">RefPtr<Derived>::cast_dynamic</a>(ptr_base);</div>
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<p>Static cast to derived class. </p>
<p>Like the dynamic cast; the notation is </p><div class="fragment"><div class="line">ptr_derived = <a class="code" href="classGlib_1_1RefPtr.html#a2930d8c0eaa2610ee58cd267d325cc6e">RefPtr<Derived>::cast_static</a>(ptr_base);</div>
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<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000036">Deprecated:</a></b></dt><dd>Use <a class="el" href="classGlib_1_1RefPtr.html#abdcc38a6aeef7ae330c045eaf9324b71" title="Set underlying instance to 0, decrementing reference count of existing instance appropriately. ">reset()</a> instead because this leads to confusion with <a class="el" href="classGlib_1_1RefPtr.html#ab7fb103f02d4a0fb21d7a8d0824047cc">clear()</a> methods on the underlying class. For instance, people use .<a class="el" href="classGlib_1_1RefPtr.html#ab7fb103f02d4a0fb21d7a8d0824047cc">clear()</a> when they mean -><a class="el" href="classGlib_1_1RefPtr.html#ab7fb103f02d4a0fb21d7a8d0824047cc">clear()</a>. </dd></dl>
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<p>Test whether the RefPtr<> points to any underlying instance. </p>
<p>Mimics usage of ordinary pointers: </p><div class="fragment"><div class="line"><span class="keywordflow">if</span> (ptr)</div>
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<p>See <a class="el" href="classGlib_1_1RefPtr.html#a94830ac72b547040600ba157af592a93" title="Tests whether the RefPtr<> point to the same underlying instance. ">operator==()</a>. </p>
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<p>Dereferencing. </p>
<p>Use the methods of the underlying instance like so: <code>refptr->memberfun()</code>. </p>
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<p>Compare based on the underlying instance address. </p>
<p>This is needed in code that requires an ordering on RefPtr<T_CppObject> instances, e.g. <a class="elRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00914.html">std::set</a><RefPtr<T_CppObject> >.</p>
<p>Without these, comparing two RefPtr<T_CppObject> instances is still syntactically possible, but the result is semantically wrong, as p1 REL_OP p2 is interpreted as (bool)p1 REL_OP (bool)p2. </p>
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<p>See <a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c" title="Compare based on the underlying instance address. ">operator<()</a>. </p>
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<p>Copy from another <a class="el" href="classGlib_1_1RefPtr.html" title="RefPtr<> is a reference-counting shared smartpointer. ">RefPtr</a>: </p>
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<p>Copy from different, but castable type). </p>
<p>Increments the reference count. </p>
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<p>Tests whether the RefPtr<> point to the same underlying instance. </p>
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<p>See <a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c" title="Compare based on the underlying instance address. ">operator<()</a>. </p>
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<td class="memname">bool <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a>< T_CppObject >::operator>= </td>
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<p>See <a class="el" href="classGlib_1_1RefPtr.html#a5ea9b5eed0b4169b85f0c46f5ee0378c" title="Compare based on the underlying instance address. ">operator<()</a>. </p>
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<td class="memname">void <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a>< T_CppObject >::reset </td>
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<p>Set underlying instance to 0, decrementing reference count of existing instance appropriately. </p>
<dl class="since_2_16"><dt><b><a class="el" href="since_2_16.html#_since_2_16000011">Since glibmm 2.16:</a></b></dt><dd></dd></dl>
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<td class="memname">void <a class="el" href="classGlib_1_1RefPtr.html">Glib::RefPtr</a>< T_CppObject >::swap </td>
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<p>Swap the contents of two RefPtr<>. </p>
<p>This method swaps the internal pointers to T_CppObject. This can be done safely without involving a reference/unreference cycle and is therefore highly efficient. </p>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<td class="memname">void swap </td>
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<td class="paramname"><em>lhs</em>, </td>
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