.. wxPython Phoenix documentation

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   Copyright: (c) 2011-2017 by Total Control Software
   License:   wxWindows License

.. include:: headings.inc



.. _wx.RefCounter:

==========================================================================================================================================
|phoenix_title|  **wx.RefCounter**
==========================================================================================================================================

This class is used to manage reference-counting providing a simple interface and a counter.          

:ref:`wx.RefCounter`  can be easily used together with :ref:`ObjectDataPtr`  to ensure that no calls to :meth:`wx.RefCounter.DecRef`   are missed - thus avoiding memory leaks. 

:ref:`wx.ObjectRefData`  is a typedef to :ref:`wx.RefCounter`  and is used as the built-in reference counted storage for Object-derived classes. 







         



.. seealso:: :ref:`wx.Object`, :ref:`wx.ObjectRefData`, :ref:`ObjectDataPtr`, :ref:`Reference Counting <reference counting>`    







|

|class_hierarchy| Class Hierarchy
=================================

.. raw:: html

   <div id="toggleBlock" onclick="return toggleVisibility(this)" class="closed" style="cursor:pointer;">
   <img id="toggleBlock-trigger" src="_static/images/closed.png"/>
   Inheritance diagram for class <strong>RefCounter</strong>:
   </div>
   <div id="toggleBlock-summary" style="display:block;"></div>
   <div id="toggleBlock-content" style="display:none;">
   <p class="graphviz">
   <center><img src="_static/images/inheritance/wx.RefCounter_inheritance.png" alt="Inheritance diagram of RefCounter" usemap="#dummy" class="inheritance"/></center>
   </div>
   <script type="text/javascript">toggleVisibilityOnLoad(document.getElementById('toggleBlock'))</script>
   <map id="dummy" name="dummy"> <area shape="rect" id="node1" href="wx.RefCounter.html" title="wx.RefCounter" alt="" coords="4,5,115,35"/> </map> 
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|


|sub_classes| Known Subclasses
==============================

:ref:`wx.dataview.DataViewModel`, :ref:`wx.grid.GridCellAttr`, :ref:`wx.grid.GridCellEditor`, :ref:`wx.grid.GridCellRenderer`

|


|method_summary| Methods Summary
================================

================================================================================ ================================================================================
:meth:`~wx.RefCounter.__init__`                                                  Default constructor.
:meth:`~wx.RefCounter.DecRef`                                                    Decrements the reference count associated with this shared data and, if it reaches zero, destroys this instance of :ref:`wx.RefCounter`  releasing its memory.
:meth:`~wx.RefCounter.GetRefCount`                                               Returns the reference count associated with this shared data.
:meth:`~wx.RefCounter.IncRef`                                                    Increments the reference count associated with this shared data.
:meth:`~wx.RefCounter.~wxRefCounter`                                             Destructor.
================================================================================ ================================================================================


|


|property_summary| Properties Summary
=====================================

================================================================================ ================================================================================
:attr:`~wx.RefCounter.RefCount`                                                  See :meth:`~wx.RefCounter.GetRefCount`
================================================================================ ================================================================================


|


|api| Class API
===============


.. class:: wx.RefCounter(object)

   **Possible constructors**::

       RefCounter()
       
   
   This class is used to manage reference-counting providing a simple
   interface and a counter.



   .. method:: __init__(self)

      Default constructor.                  

      Initialises the internal reference count to 1.                   





   .. method:: DecRef(self)

      Decrements the reference count associated with this shared data and, if it reaches zero, destroys this instance of :ref:`wx.RefCounter`  releasing its memory.                  

      Please note that after calling this function, the caller should absolutely avoid to use the pointer to this instance since it may not be valid anymore.                   





   .. method:: GetRefCount(self)

      Returns the reference count associated with this shared data.                  

      When this goes to zero during a :meth:`DecRef`   call, the object will auto-free itself.                  

      :rtype: `int`








   .. method:: IncRef(self)

      Increments the reference count associated with this shared data.                   





   .. method:: ~wxRefCounter(self)

      Destructor.                  

      It's declared  ``protected``   so that  :ref:`wx.RefCounter`  instances will never be destroyed directly but only as result of a :meth:`DecRef`   call.                   





   .. attribute:: RefCount

      See :meth:`~wx.RefCounter.GetRefCount`

