// Purpose: interface of wxRefCounter
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/** @class wxObjectRefData
This class is just a typedef to wxRefCounter and is used by wxObject.
- Derive classes from this to store your own data. When retrieving information
- from a wxObject's reference data, you will need to cast to your own derived class.
+ Derive classes from this to store your own data in wxObject-derived
+ classes. When retrieving information from a wxObject's reference data,
+ you will need to cast to your own derived class.
+
+ Below is an example illustrating how to store reference counted
+ data in a class derived from wxObject including copy-on-write
+ semantics.
@section objectrefdata_example Example
virtual wxObjectRefData *CreateRefData() const;
virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const;
- DECLARE_DYNAMIC_CLASS(MyCar)
+ wxDECLARE_DYNAMIC_CLASS(MyCar)
};
#define M_CARDATA ((MyCarRefData *)m_refData)
- IMPLEMENT_DYNAMIC_CLASS(MyCar,wxObject)
+ wxIMPLEMENT_DYNAMIC_CLASS(MyCar, wxObject);
MyCar::MyCar( int price )
{
m_refData = new MyCarRefData();
M_CARDATA->m_price = price;
}
-
+
wxObjectRefData *MyCar::CreateRefData() const
{
return new MyCarRefData;
{
if (m_refData == car.m_refData)
return true;
- if (!m_refData || !car.m_refData)
+ if (!m_refData || !car.m_refData)
return false;
// here we use the MyCarRefData::operator==() function.
}
@endcode
-
+
@library{wxbase}
@category{rtti}
/**
@class wxRefCounter
- This class is used to manage reference-counting.
+ This class is used to manage reference-counting providing a simple
+ interface and a counter. wxRefCounter can be easily used together
+ with wxObjectDataPtr<T> to ensure that no calls to wxRefCounter::DecRef()
+ are missed - thus avoiding memory leaks.
+
+ wxObjectRefData is a typedef to wxRefCounter and is used as the
+ built-in reference counted storage for wxObject-derived classes.
@library{wxbase}
@category{rtti}
@library{wxbase}
@category{rtti}
- @see wxClassInfo, @ref overview_debugging, @ref overview_refcount,
+ @see wxClassInfo, @ref overview_debugging, @ref overview_refcount,
wxObjectDataRef, wxObjectDataPtr<T>
*/
class wxObject
/**
This virtual function is redefined for every class that requires run-time
- type information, when using the ::DECLARE_CLASS macro (or similar).
+ type information, when using the ::wxDECLARE_CLASS macro (or similar).
*/
virtual wxClassInfo* GetClassInfo() const;
Example:
@code
- bool tmp = obj->IsKindOf(CLASSINFO(wxFrame));
+ bool tmp = obj->IsKindOf(wxCLASSINFO(wxFrame));
@endcode
@param info
A pointer to a class information object, which may be obtained
- by using the ::CLASSINFO macro.
+ by using the ::wxCLASSINFO macro.
@return @true if the class represented by info is the same class as this
one or is derived from it.
Ensure that this object's data is not shared with any other object.
If we have no data, it is created using CreateRefData();
- if we have shared data (i.e. data with a reference count greater than 1),
+ if we have shared data (i.e. data with a reference count greater than 1),
it is copied using CloneRefData(); otherwise nothing is done (the data
is already present and is not shared by other object instances).
-
+
If you use this function you should make sure that you override the
CreateRefData() and CloneRefData() functions in your class otherwise
an assertion will fail at runtime.
/**
Creates a new instance of the wxObjectRefData-derived class specific to
this object and returns it.
-
+
This is usually implemented as a one-line call:
@code
wxObjectRefData *MyObject::CreateRefData() const
/**
Creates a new instance of the wxObjectRefData-derived class specific to
this object and initializes it copying @a data.
-
+
This is usually implemented as a one-line call:
@code
wxObjectRefData *MyObject::CloneRefData(const wxObjectRefData *data) const
This class stores meta-information about classes.
Instances of this class are not generally defined directly by an application,
- but indirectly through use of macros such as ::DECLARE_DYNAMIC_CLASS and
- ::IMPLEMENT_DYNAMIC_CLASS.
+ but indirectly through use of macros such as ::wxDECLARE_DYNAMIC_CLASS and
+ ::wxIMPLEMENT_DYNAMIC_CLASS.
@library{wxbase}
@category{rtti}
/**
- This is an helper template class primarily written to avoid memory leaks because of
- missing calls to wxObjectRefData::DecRef().
+ This is an helper template class primarily written to avoid memory leaks because
+ of missing calls to wxRefCounter::DecRef() and wxObjectRefData::DecRef().
Despite the name this template can actually be used as a smart pointer for any
class implementing the reference counting interface which only consists of the two
counting to be in the class pointed to, where instead wxSharedPtr<T> implements the
reference counting itself.
+ Below is an example illustrating how to implement reference counted
+ data using wxRefCounter and wxObjectDataPtr<T> with copy-on-write
+ semantics.
+
@section objectdataptr_example Example
@code
- class MyCarRefData: public wxObjectRefData
+ class MyCarRefData: public wxRefCounter
{
public:
- MyCarRefData() { m_price = 0; }
-
- MyCarRefData( const MyCarRefData& data )
- : wxObjectRefData()
- {
- m_price = data.m_price;
- }
+ MyCarRefData( int price = 0 ) : m_price(price) { }
+ MyCarRefData( const MyCarRefData& data ) : m_price(data.m_price) { }
void SetPrice( int price ) { m_price = price; }
int GetPrice() const { return m_price; }
- bool operator == ( const MyCarRefData& other ) const
- {
- return m_price == other.m_price;
- }
-
protected:
int m_price;
};
public:
// initializes this MyCar assigning to the
// internal data pointer a new instance of MyCarRefData
- MyCar( int price ) : m_data( new MyCarRefData )
+ MyCar( int price = 0 ) : m_data( new MyCarRefData(price) )
{
- m_data->SetPrice( price );
}
MyCar& operator =( const MyCar& tocopy )
if (m_data.get() == other.m_data.get())
return true; // this instance and the 'other' one share the
// same MyCarRefData data...
-
- // rely on the MyCarRefData::operator==()
- return (*m_data.get()) == (*other.m_data.get());
+
+ return (m_data.GetPrice() == other.m_data.GetPrice());
}
void SetPrice( int price )
// make sure changes to this class do not affect other instances
// currently sharing our same refcounted data:
UnShare();
-
+
m_data->SetPrice( price );
}
@header{wx/object.h}
*/
-#define CLASSINFO( className )
-
-/**
- Used inside a class declaration to declare that the class should be made
- known to the class hierarchy, but objects of this class cannot be created
- dynamically. The same as DECLARE_ABSTRACT_CLASS().
-
- @header{wx/object.h}
-*/
-#define DECLARE_CLASS( className )
+#define wxCLASSINFO( className )
/**
Used inside a class declaration to declare that the class should be
made known to the class hierarchy, but objects of this class cannot be created
- dynamically. The same as DECLARE_CLASS().
+ dynamically.
@header{wx/object.h}
@code
class wxCommand: public wxObject
{
- DECLARE_ABSTRACT_CLASS(wxCommand)
+ wxDECLARE_ABSTRACT_CLASS(wxCommand);
private:
...
};
@endcode
*/
-#define DECLARE_ABSTRACT_CLASS( className )
+#define wxDECLARE_ABSTRACT_CLASS( className )
/**
Used inside a class declaration to make the class known to wxWidgets RTTI
system and also declare that the objects of this class should be
dynamically creatable from run-time type information. Notice that this
implies that the class should have a default constructor, if this is not
- the case consider using DECLARE_CLASS().
+ the case consider using wxDECLARE_ABSTRACT_CLASS().
@header{wx/object.h}
@code
class wxFrame: public wxWindow
{
- DECLARE_DYNAMIC_CLASS(wxFrame)
+ wxDECLARE_DYNAMIC_CLASS(wxFrame);
private:
const wxString& frameTitle;
};
@endcode
*/
-#define DECLARE_DYNAMIC_CLASS( className )
+#define wxDECLARE_DYNAMIC_CLASS( className )
/**
- Used in a C++ implementation file to complete the declaration of a class
- that has run-time type information. The same as IMPLEMENT_ABSTRACT_CLASS().
-
- @header{wx/object.h}
-*/
-#define IMPLEMENT_CLASS( className, baseClassName )
+ Used inside a class declaration to declare that the class should be made
+ known to the class hierarchy, but objects of this class cannot be created
+ dynamically.
-/**
- Used in a C++ implementation file to complete the declaration of a class
- that has run-time type information and two base classes. The same as
- IMPLEMENT_ABSTRACT_CLASS2().
+ The same as wxDECLARE_ABSTRACT_CLASS().
@header{wx/object.h}
*/
-#define IMPLEMENT_CLASS2( className, baseClassName1, baseClassName2 )
+#define wxDECLARE_CLASS( className )
/**
Used in a C++ implementation file to complete the declaration of a class
- that has run-time type information. The same as IMPLEMENT_CLASS().
-
+ that has run-time type information.
+
@header{wx/object.h}
Example:
@code
- IMPLEMENT_ABSTRACT_CLASS(wxCommand, wxObject)
+ wxIMPLEMENT_ABSTRACT_CLASS(wxCommand, wxObject);
wxCommand::wxCommand(void)
{
}
@endcode
*/
-#define IMPLEMENT_ABSTRACT_CLASS( className, baseClassName )
+#define wxIMPLEMENT_ABSTRACT_CLASS( className, baseClassName )
/**
Used in a C++ implementation file to complete the declaration of a class
- that has run-time type information and two base classes. The same as
- IMPLEMENT_CLASS2().
+ that has run-time type information and two base classes.
@header{wx/object.h}
*/
-#define IMPLEMENT_ABSTRACT_CLASS2( className, baseClassName1, baseClassName2 )
+#define wxIMPLEMENT_ABSTRACT_CLASS2( className, baseClassName1, baseClassName2 )
/**
Used in a C++ implementation file to complete the declaration of a class
Example:
@code
- IMPLEMENT_DYNAMIC_CLASS(wxFrame, wxWindow)
+ wxIMPLEMENT_DYNAMIC_CLASS(wxFrame, wxWindow);
wxFrame::wxFrame(void)
{
}
@endcode
*/
-#define IMPLEMENT_DYNAMIC_CLASS( className, baseClassName )
+#define wxIMPLEMENT_DYNAMIC_CLASS( className, baseClassName )
/**
Used in a C++ implementation file to complete the declaration of a class
@header{wx/object.h}
*/
-#define IMPLEMENT_DYNAMIC_CLASS2( className, baseClassName1, baseClassName2 )
+#define wxIMPLEMENT_DYNAMIC_CLASS2( className, baseClassName1, baseClassName2 )
+
+/**
+ Used in a C++ implementation file to complete the declaration of a class
+ that has run-time type information, and whose instances can be created
+ dynamically. The same as wxIMPLEMENT_DYNAMIC_CLASS().
+
+ @header{wx/object.h}
+*/
+#define wxIMPLEMENT_CLASS( className, baseClassName )
+
+/**
+ Used in a C++ implementation file to complete the declaration of a class
+ that has run-time type information and two base classes, and whose instances
+ can be created dynamically. The same as wxIMPLEMENT_DYNAMIC_CLASS2().
+
+ @header{wx/object.h}
+*/
+#define wxIMPLEMENT_CLASS2( className, baseClassName1, baseClassName2 )
/**
Same as @c const_cast<T>(x) if the compiler supports const cast or @c (T)x for
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