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<h1>Glib::RefPtr< T_CppObject > Class Template Reference</h1>RefPtr<> is a reference-counting shared smartpointer.
<a href="#_details">More...</a>
<p>
<a href="classGlib_1_1RefPtr-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 Methods</h2></td></tr>
<tr><td nowrap align=right valign=top> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a0">RefPtr</a> ()</td></tr>
<tr><td> </td><td><font size=-1><em>Default constructor.</em> <a href="#a0"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a1">~RefPtr</a> ()</td></tr>
<tr><td> </td><td><font size=-1><em>Destructor - decrements reference count.</em> <a href="#a1"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a2">RefPtr</a> (T_CppObject* pCppObject)</td></tr>
<tr><td> </td><td><font size=-1><em>For use only by the ::create() methods.</em> <a href="#a2"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a3">RefPtr</a> (const RefPtr<T_CppObject>& src)</td></tr>
<tr><td> </td><td><font size=-1><em>Copy constructor.</em> <a href="#a3"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>template <class T_CastFrom> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a4">RefPtr</a> (const RefPtr<T_CastFrom>& src)</td></tr>
<tr><td> </td><td><font size=-1><em>Copy constructor (from different, but castable type).</em> <a href="#a4"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>void </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a5">swap</a> (RefPtr<T_CppObject>& other)</td></tr>
<tr><td> </td><td><font size=-1><em>Swap the contents of two RefPtr<>.</em> <a href="#a5"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>RefPtr<T_CppObject>& </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a6">operator=</a> (const RefPtr<T_CppObject>& src)</td></tr>
<tr><td> </td><td><font size=-1><em>Copy from another RefPtr:.</em> <a href="#a6"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>RefPtr<T_CppObject>& </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a7">operator=</a> (T_CppObject* pCppObject)</td></tr>
<tr><td> </td><td><font size=-1><em>For use only by the ::create() methods.</em> <a href="#a7"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>template <class T_CastFrom> RefPtr<T_CppObject>& </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a8">operator=</a> (const RefPtr<T_CastFrom>& src)</td></tr>
<tr><td> </td><td><font size=-1><em>Copy from different, but castable type).</em> <a href="#a8"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>bool </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a9">operator==</a> (const RefPtr<T_CppObject>& src) const</td></tr>
<tr><td> </td><td><font size=-1><em>Tests whether the RefPtr<> point to the same underlying instance.</em> <a href="#a9"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>bool </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a10">operator!=</a> (const RefPtr<T_CppObject>& src) const</td></tr>
<tr><td> </td><td><font size=-1><em>See <a class="el" href="classGlib_1_1RefPtr.html#a9">operator==()</a>.</em> <a href="#a10"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>T_CppObject* </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a11">operator-></a> () const</td></tr>
<tr><td> </td><td><font size=-1><em>Dereferencing.</em> <a href="#a11"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a12">operator bool</a> () const</td></tr>
<tr><td> </td><td><font size=-1><em>Test whether the RefPtr<> points to any underlying instance.</em> <a href="#a12"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>bool </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a13">is_null</a> () const</td></tr>
<tr><td> </td><td><font size=-1><em>Test whether the RefPtr<> points to any underlying instance.</em> <a href="#a13"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>void </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#a14">clear</a> ()</td></tr>
<tr><td> </td><td><font size=-1><em>Set underlying instance to 0, decrementing reference count of existing instance appropriately.</em> <a href="#a14"></a><em></em></font><br><br></td></tr>
<tr><td colspan=2><br><h2>Static Public Methods</h2></td></tr>
<tr><td nowrap align=right valign=top>template <class T_CastFrom> RefPtr<T_CppObject> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#d0">cast_dynamic</a> (const RefPtr<T_CastFrom>& src)</td></tr>
<tr><td> </td><td><font size=-1><em>Dynamic cast to derived class.</em> <a href="#d0"></a><em></em></font><br><br></td></tr>
<tr><td nowrap align=right valign=top>template <class T_CastFrom> RefPtr<T_CppObject> </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#d1">cast_static</a> (const RefPtr<T_CastFrom>& src)</td></tr>
<tr><td> </td><td><font size=-1><em>Static cast to derived class.</em> <a href="#d1"></a><em></em></font><br><br></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 nowrap align=right valign=top>void </td><td valign=bottom><a class="el" href="classGlib_1_1RefPtr.html#k0">swap</a> (RefPtr<T_CppObject>& lhs, RefPtr<T_CppObject>& rhs)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<h3>template <class T_CppObject><br>
class Glib::RefPtr< T_CppObject ></h3>
RefPtr<> is a reference-counting shared smartpointer.
<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">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">RefPtr</a> doesn't support dereferencing through <code>* object_ptr</code>.
<p>
Reference counting means that a shared reference count is incremented each time a <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a> is copied, and decremented each time a <a class="el" href="classGlib_1_1RefPtr.html">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>
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">Glib::ObjectBase</a>, such as <a class="el" href="classGdk_1_1Pixmap.html">Gdk::Pixmap</a>.
<p>
See the "Memory Management" section in the "Programming with gtkmm" book for further information.
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a name="a0" doxytag="Glib::RefPtr::RefPtr"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> Glib::RefPtr<T_CppObject>::RefPtr </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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<p>
Default constructor.
<p>
Afterwards <a class="el" href="classGlib_1_1RefPtr.html#a13">is_null()</a> will return true and use of -> will cause a segmentation fault. </td>
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<a name="a1" doxytag="Glib::RefPtr::~RefPtr"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> Glib::RefPtr<T_CppObject>::~RefPtr </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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Destructor - decrements reference count.
<p>
</td>
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<a name="a2" doxytag="Glib::RefPtr::RefPtr"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> Glib::RefPtr<T_CppObject>::RefPtr </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">T_CppObject* </td>
<td class="mdname1" valign="top" nowrap> <em>pCppObject</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline, explicit]</code></td>
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<p>
For use only by the ::create() methods.
<p>
</td>
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<a name="a3" doxytag="Glib::RefPtr::RefPtr"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> Glib::RefPtr<T_CppObject>::RefPtr </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CppObject>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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<p>
Copy constructor.
<p>
This increments the shared reference count. </td>
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<a name="a4" doxytag="Glib::RefPtr::RefPtr"></a><p>
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template <class T_CppObject> </td>
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<td class="md" colspan="4">
template <class T_CastFrom> </td>
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<tr>
<td class="md" nowrap valign="top"> Glib::RefPtr<T_CppObject>::RefPtr </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CastFrom>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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</td>
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<p>
Copy constructor (from different, but castable type).
<p>
Increments the reference count. </td>
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<hr><h2>Member Function Documentation</h2>
<a name="d0" doxytag="Glib::RefPtr::cast_dynamic"></a><p>
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template <class T_CppObject> </td>
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template <class T_CastFrom> </td>
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<td class="md" nowrap valign="top"> RefPtr<T_CppObject> Glib::RefPtr<T_CppObject>::cast_dynamic </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CastFrom>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline, static]</code></td>
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</td>
<td>
<p>
Dynamic cast to derived class.
<p>
The <a class="el" href="classGlib_1_1RefPtr.html">RefPtr</a> can't be cast with the usual notation so instead you can use <div class="fragment"><pre>
ptr_derived = RefPtr<Derived>::cast_dynamic(ptr_base);
</pre></div> </td>
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<a name="d1" doxytag="Glib::RefPtr::cast_static"></a><p>
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template <class T_CppObject> </td>
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template <class T_CastFrom> </td>
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<td class="md" nowrap valign="top"> RefPtr<T_CppObject> Glib::RefPtr<T_CppObject>::cast_static </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CastFrom>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline, static]</code></td>
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<p>
Static cast to derived class.
<p>
Like the dynamic cast; the notation is <div class="fragment"><pre>
ptr_derived = RefPtr<Derived>::cast_static(ptr_base);
</pre></div> </td>
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<a name="a14" doxytag="Glib::RefPtr::clear"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> void Glib::RefPtr<T_CppObject>::clear </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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Set underlying instance to 0, decrementing reference count of existing instance appropriately.
<p>
</td>
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<a name="a13" doxytag="Glib::RefPtr::is_null"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> bool Glib::RefPtr<T_CppObject>::is_null </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
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</td>
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<p>
Test whether the RefPtr<> points to any underlying instance.
<p>
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<a name="a12" doxytag="Glib::RefPtr::operator bool"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> Glib::RefPtr<T_CppObject>::operator bool </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
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<p>
Test whether the RefPtr<> points to any underlying instance.
<p>
Mimics usage of ordinary pointers: <div class="fragment"><pre>
<span class="keywordflow">if</span> (ptr)
do_something();
</pre></div> </td>
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<a name="a10" doxytag="Glib::RefPtr::operator!="></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> bool Glib::RefPtr<T_CppObject>::operator!= </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CppObject>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
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<p>
See <a class="el" href="classGlib_1_1RefPtr.html#a9">operator==()</a>.
<p>
</td>
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<a name="a11" doxytag="Glib::RefPtr::operator->"></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> T_CppObject* Glib::RefPtr<T_CppObject>::operator-> </td>
<td class="md" valign="top">(</td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
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Dereferencing.
<p>
Use the methods of the underlying instance like so: <code>refptr->memberfun()</code>. </td>
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<a name="a8" doxytag="Glib::RefPtr::operator="></a><p>
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template <class T_CppObject> </td>
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template <class T_CastFrom> </td>
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<td class="md" nowrap valign="top"> RefPtr<T_CppObject>& Glib::RefPtr<T_CppObject>::operator= </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CastFrom>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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<p>
Copy from different, but castable type).
<p>
Increments the reference count. </td>
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<a name="a7" doxytag="Glib::RefPtr::operator="></a><p>
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template <class T_CppObject> </td>
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<td class="md" nowrap valign="top"> RefPtr<T_CppObject>& Glib::RefPtr<T_CppObject>::operator= </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">T_CppObject* </td>
<td class="mdname1" valign="top" nowrap> <em>pCppObject</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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</td>
</tr>
</table>
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<tr>
<td>
</td>
<td>
<p>
For use only by the ::create() methods.
<p>
</td>
</tr>
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<a name="a6" doxytag="Glib::RefPtr::operator="></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" colspan="4">
template <class T_CppObject> </td>
</tr>
<tr>
<td class="md" nowrap valign="top"> RefPtr<T_CppObject>& Glib::RefPtr<T_CppObject>::operator= </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CppObject>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Copy from another RefPtr:.
<p>
</td>
</tr>
</table>
<a name="a9" doxytag="Glib::RefPtr::operator=="></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
<tr>
<td class="md">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" colspan="4">
template <class T_CppObject> </td>
</tr>
<tr>
<td class="md" nowrap valign="top"> bool Glib::RefPtr<T_CppObject>::operator== </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">const RefPtr<T_CppObject>& </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
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</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Tests whether the RefPtr<> point to the same underlying instance.
<p>
</td>
</tr>
</table>
<a name="a5" doxytag="Glib::RefPtr::swap"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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<td class="md">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" colspan="4">
template <class T_CppObject> </td>
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<tr>
<td class="md" nowrap valign="top"> void Glib::RefPtr<T_CppObject>::swap </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">RefPtr<T_CppObject>& </td>
<td class="mdname1" valign="top" nowrap> <em>other</em> </td>
<td class="md" valign="top">) </td>
<td class="md" nowrap><code> [inline]</code></td>
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</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Swap the contents of two RefPtr<>.
<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. </td>
</tr>
</table>
<hr><h2>Friends And Related Function Documentation</h2>
<a name="k0" doxytag="Glib::RefPtr::swap"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
<tr>
<td class="md">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" colspan="4">
template <class T_CppObject> </td>
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<tr>
<td class="md" nowrap valign="top"> void swap </td>
<td class="md" valign="top">(</td>
<td class="md" nowrap valign="top">RefPtr<T_CppObject>& </td>
<td class="mdname" nowrap> <em>lhs</em>, </td>
</tr>
<tr>
<td></td>
<td></td>
<td class="md" nowrap>RefPtr<T_CppObject>& </td>
<td class="mdname" nowrap> <em>rhs</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [related]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
</td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="refptr_8h.html">refptr.h</a></ul>
<hr><address><small>
Generated for gtkmm by <a href="http://www.doxygen.org/index.html">
Doxygen</a> 1.3-rc1 © 1997-2001</small></address>
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