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/////////////////////////////////////////////////////////////////////////////
// Name: wx/dfb/dfbptr.h
// Purpose: wxDfbPtr<T> for holding objects declared in wrapdfb.h
// Author: Vaclav Slavik
// Created: 2006-08-09
// Copyright: (c) 2006 REA Elektronik GmbH
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_DFB_DFBPTR_H_
#define _WX_DFB_DFBPTR_H_
//-----------------------------------------------------------------------------
// wxDFB_DECLARE_INTERFACE
//-----------------------------------------------------------------------------
/**
Forward declares wx wrapper around DirectFB interface @a name.
Also declares wx##name##Ptr typedef for wxDfbPtr<wx##name> pointer.
@param name name of the DirectFB interface
*/
#define wxDFB_DECLARE_INTERFACE(name) \
class wx##name; \
typedef wxDfbPtr<wx##name> wx##name##Ptr;
//-----------------------------------------------------------------------------
// wxDfbPtr<T>
//-----------------------------------------------------------------------------
class wxDfbWrapperBase;
class WXDLLIMPEXP_CORE wxDfbPtrBase
{
protected:
static void DoAddRef(wxDfbWrapperBase *ptr);
static void DoRelease(wxDfbWrapperBase *ptr);
};
/**
This template implements smart pointer for keeping pointers to DirectFB
wrappers (i.e. wxIFoo classes derived from wxDfbWrapper<T>). Interface's
reference count is increased on copying and the interface is released when
the pointer is deleted.
*/
template<typename T>
class wxDfbPtr : private wxDfbPtrBase
{
public:
/**
Creates the pointer from raw pointer to the wrapper.
Takes ownership of @a ptr, i.e. AddRef() is @em not called on it.
*/
wxDfbPtr(T *ptr = NULL) : m_ptr(ptr) {}
/// Copy ctor
wxDfbPtr(const wxDfbPtr& ptr) { InitFrom(ptr); }
/// Dtor. Releases the interface
~wxDfbPtr() { Reset(); }
/// Resets the pointer to NULL, decreasing reference count of the interface.
void Reset()
{
if ( m_ptr )
{
this->DoRelease((wxDfbWrapperBase*)m_ptr);
m_ptr = NULL;
}
}
/// Cast to the wrapper pointer
operator T*() const { return m_ptr; }
// standard operators:
wxDfbPtr& operator=(T *ptr)
{
Reset();
m_ptr = ptr;
return *this;
}
wxDfbPtr& operator=(const wxDfbPtr& ptr)
{
Reset();
InitFrom(ptr);
return *this;
}
T& operator*() const { return *m_ptr; }
T* operator->() const { return m_ptr; }
private:
void InitFrom(const wxDfbPtr& ptr)
{
m_ptr = ptr.m_ptr;
if ( m_ptr )
this->DoAddRef((wxDfbWrapperBase*)m_ptr);
}
private:
T *m_ptr;
};
#endif // _WX_DFB_DFBPTR_H_
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