\section{\class{wxObject}}\label{wxobject}
-This is the root class of all wxWidgets classes.
+This is the root class of many of the wxWidgets classes.
It declares a virtual destructor which ensures that
destructors get called for all derived class objects where necessary.
of {\bf new} and {\bf delete}, which can help trace memory allocation
and deallocation problems.
-wxObject can be used to implement reference counted objects, such as
-wxPen, wxBitmap and others.
+wxObject can be used to implement \helpref{reference counted}{trefcount} objects,
+such as wxPen, wxBitmap and others (see \helpref{this list}{refcountlist}).
\wxheading{See also}
\helpref{wxClassInfo}{wxclassinfo}, \helpref{Debugging overview}{debuggingoverview},\rtfsp
\helpref{wxObjectRefData}{wxobjectrefdata}
+\wxheading{Derived from}
+
+No base class
+
+\wxheading{Include files}
+
+<wx/object.h>
+
+\wxheading{Library}
+
+\helpref{wxBase}{librarieslist}
+
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxObject::wxObject}\label{wxobjectconstr}
+\membersection{wxObject::wxObject}\label{wxobjectctor}
\func{}{wxObject}{\void}
Default and copy constructors.
-\membersection{wxObject::\destruct{wxObject}}
+\membersection{wxObject::\destruct{wxObject}}\label{wxobjectdtor}
\func{}{wxObject}{\void}
bool tmp = obj->IsKindOf(CLASSINFO(wxFrame));
\end{verbatim}
+\membersection{wxObject::IsSameAs}\label{wxobjectissameas}
+
+\func{bool}{IsSameAs}{\param{const wxObject\& }{ obj}}
+
+Returns \true if this object has the same data pointer as \arg{obj}. Notice
+that \true is returned if the data pointers are \NULL in both objects.
+
+This function only does a \emph{shallow} comparison, i.e. it doesn't compare
+the objects pointed to by the data pointers of these objects.
+
\membersection{wxObject::Ref}\label{wxobjectref}
\func{void}{Ref}{\param{const wxObject\& }{clone}}
\helpref{wxObject::SetRefData}{wxobjectsetrefdata}, \helpref{wxObject::GetRefData}{wxobjectgetrefdata},\rtfsp
\helpref{wxObjectRefData}{wxobjectrefdata}
+\membersection{wxObject::UnShare}\label{wxobjectunshare}
+
+\func{void}{UnShare}{\void}
+
+Ensure that this object's data is not shared with any other object.
+
+if we have no
+data, it is created using CreateRefData() below, if we have shared data
+it is copied using CloneRefData(), otherwise nothing is done.
+
+
\membersection{wxObject::operator new}\label{wxobjectnew}
\func{void *}{new}{\param{size\_t }{size}, \param{const wxString\& }{filename = NULL}, \param{int}{ lineNum = 0}}
the identifier \_\_WXDEBUG\_\_ is defined. It takes over memory deallocation, allowing
wxDebugContext operations.
+
+
+%% wxObjectRefData
+
\section{\class{wxObjectRefData}}\label{wxobjectrefdata}
This class is used to store reference-counted data. Derive classes from this to
\wxheading{See also}
\helpref{wxObject}{wxobject}
+\helpref{wxObjectDataPtr<T>}{wxobjectdataptr}
+\helpref{Reference counting}{trefcount}
-\latexignore{\rtfignore{\wxheading{Members}}}
+\wxheading{Derived from}
+
+No base class
+
+\wxheading{Include files}
+
+<wx/object.h>
+
+\wxheading{Example}
+
+\begin{verbatim}
+
+// include file
+
+class MyCar: public wxObject
+{
+public:
+ MyCar() { }
+ MyCar( int price );
+
+ bool IsOk() const { return m_refData != NULL; }
+
+ bool operator == ( const MyCar& car ) const;
+ bool operator != (const MyCar& car) const { return !(*this == car); }
+
+ void SetPrice( int price );
+ int GetPrice() const;
+
+protected:
+ virtual wxObjectRefData *CreateRefData() const;
+ virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const;
+
+ DECLARE_DYNAMIC_CLASS(MyCar)
+};
-\membersection{wxObjectRefData::m\_count}
-\member{int}{m\_count}
+// implementation
-Reference count. When this goes to zero during a \helpref{wxObject::UnRef}{wxobjectunref}, an object
-can delete the {\bf wxObjectRefData} object.
+class MyCarRefData: public wxObjectRefData
+{
+public:
+ MyCarRefData()
+ {
+ m_price = 0;
+ }
-\membersection{wxObjectRefData::wxObjectRefData}\label{wxobjectrefdataconstr}
+ MyCarRefData( const MyCarRefData& data )
+ : wxObjectRefData()
+ {
+ m_price = data.m_price;
+ }
+
+ bool operator == (const MyCarRefData& data) const
+ {
+ return m_price == data.m_price;
+ }
+
+ int m_price;
+};
+
+
+#define M_CARDATA ((MyCarRefData *)m_refData)
+
+IMPLEMENT_DYNAMIC_CLASS(MyCar,wxObject)
+
+MyCar::MyCar( int price )
+{
+ m_refData = new MyCarRefData();
+ M_CARDATA->m_price = price;
+}
+
+wxObjectRefData *MyCar::CreateRefData() const
+{
+ return new MyCarRefData;
+}
+
+wxObjectRefData *MyCar::CloneRefData(const wxObjectRefData *data) const
+{
+ return new MyCarRefData(*(MyCarRefData *)data);
+}
+
+bool MyCar::operator == ( const MyCar& car ) const
+{
+ if (m_refData == car.m_refData) return true;
+
+ if (!m_refData || !car.m_refData) return false;
+
+ return ( *(MyCarRefData*)m_refData == *(MyCarRefData*)car.m_refData );
+}
+
+void MyCar::SetPrice( int price )
+{
+ UnShare();
+
+ M_CARDATA->m_price = price;
+}
+
+int MyCar::GetPrice() const
+{
+ wxCHECK_MSG( IsOk(), -1, "invalid car" );
+
+ return (M_CARDATA->m_price);
+}
+
+\end{verbatim}
+
+\wxheading{Library}
+
+\helpref{wxBase}{librarieslist}
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+
+\membersection{wxObjectRefData::wxObjectRefData}\label{wxobjectrefdatactor}
\func{}{wxObjectRefData}{\void}
-Default constructor. Initialises the {\bf m\_count} member to 1.
+Default constructor. Initialises the internal reference count to 1.
-\membersection{wxObjectRefData::\destruct{wxObjectRefData}}
+\membersection{wxObjectRefData::\destruct{wxObjectRefData}}\label{wxobjectrefdatadtor}
\func{}{wxObjectRefData}{\void}
-Destructor.
+Destructor. It's declared {\tt protected} so that wxObjectRefData instances will never
+be destroyed directly but only as result of a \helpref{DecRef}{wxobjectrefdatadecref} call.
+
+\membersection{wxObjectRefData::GetRefCount}\label{wxobjectrefdatagetrefcount}
+
+\constfunc{int}{GetRefCount}{\void}
+
+Returns the reference count associated with this shared data.
+When this goes to zero during a \helpref{DecRef}{wxobjectrefdatadecref} call, the object
+will auto-free itself.
+
+\membersection{wxObjectRefData::DecRef}\label{wxobjectrefdatadecref}
+
+\func{void}{DecRef}{\void}
+
+Decrements the reference count associated with this shared data and, if it reaches zero,
+destroys this instance of wxObjectRefData 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.
+
+\membersection{wxObjectRefData::IncRef}\label{wxobjectrefdataincref}
+
+\func{void}{IncRef}{\void}
+Increments the reference count associated with this shared data.
projects / wxWidgets.git / blobdiff