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b3c86150 1/////////////////////////////////////////////////////////////////////////////
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2// Name: wx/dfb/dfbptr.h
3// Purpose: wxDfbPtr<T> for holding objects declared in wrapdfb.h
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4// Author: Vaclav Slavik
5// Created: 2006-08-09
6// RCS-ID: $Id$
7// Copyright: (c) 2006 REA Elektronik GmbH
8// Licence: wxWindows licence
9/////////////////////////////////////////////////////////////////////////////
10
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11#ifndef _WX_DFB_DFBPTR_H_
12#define _WX_DFB_DFBPTR_H_
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13
14//-----------------------------------------------------------------------------
15// wxDFB_DECLARE_INTERFACE
16//-----------------------------------------------------------------------------
17
18/**
52c8d32a 19 Forward declares wx wrapper around DirectFB interface @a name.
b3c86150 20
52c8d32a 21 Also declares wx##name##Ptr typedef for wxDfbPtr<wx##name> pointer.
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22
23 @param name name of the DirectFB interface
24 */
25#define wxDFB_DECLARE_INTERFACE(name) \
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26 class wx##name; \
27 typedef wxDfbPtr<wx##name> wx##name##Ptr;
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28
29
30//-----------------------------------------------------------------------------
52c8d32a 31// wxDfbPtr<T>
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32//-----------------------------------------------------------------------------
33
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34class wxDfbWrapperBase;
35
50b2d544 36class WXDLLIMPEXP_CORE wxDfbPtrBase
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37{
38protected:
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39 static void DoAddRef(wxDfbWrapperBase *ptr);
40 static void DoRelease(wxDfbWrapperBase *ptr);
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41};
42
43/**
44 This template implements smart pointer for keeping pointers to DirectFB
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45 wrappers (i.e. wxIFoo classes derived from wxDfbWrapper<T>). Interface's
46 reference count is increased on copying and the interface is released when
47 the pointer is deleted.
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48 */
49template<typename T>
50class wxDfbPtr : private wxDfbPtrBase
51{
52public:
53 /**
52c8d32a 54 Creates the pointer from raw pointer to the wrapper.
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55
56 Takes ownership of @a ptr, i.e. AddRef() is @em not called on it.
57 */
58 wxDfbPtr(T *ptr = NULL) : m_ptr(ptr) {}
59
60 /// Copy ctor
61 wxDfbPtr(const wxDfbPtr& ptr) { InitFrom(ptr); }
62
63 /// Dtor. Releases the interface
64 ~wxDfbPtr() { Reset(); }
65
66 /// Resets the pointer to NULL, decreasing reference count of the interface.
67 void Reset()
68 {
69 if ( m_ptr )
70 {
52c8d32a 71 this->DoRelease((wxDfbWrapperBase*)m_ptr);
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72 m_ptr = NULL;
73 }
74 }
75
52c8d32a 76 /// Cast to the wrapper pointer
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77 operator T*() const { return m_ptr; }
78
52c8d32a 79 // standard operators:
b3c86150 80
52c8d32a 81 wxDfbPtr& operator=(T *ptr)
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82 {
83 Reset();
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84 m_ptr = ptr;
85 return *this;
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86 }
87
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88 wxDfbPtr& operator=(const wxDfbPtr& ptr)
89 {
90 Reset();
91 InitFrom(ptr);
92 return *this;
93 }
94
95 T& operator*() const { return *m_ptr; }
96 T* operator->() const { return m_ptr; }
97
98private:
99 void InitFrom(const wxDfbPtr& ptr)
100 {
101 m_ptr = ptr.m_ptr;
102 if ( m_ptr )
52c8d32a 103 this->DoAddRef((wxDfbWrapperBase*)m_ptr);
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104 }
105
106private:
107 T *m_ptr;
108};
109
52c8d32a 110#endif // _WX_DFB_DFBPTR_H_