projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| 5200ca36 RR |
1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: wx/ptr_shrd.h | |
| 3 | // Purpose: Shared pointer based on the counted_ptr<> template, which | |
| 4 | // is in the public domain | |
| 5 | // Author: Robert Roebling, Yonat Sharon | |
| 6 | // RCS-ID: $Id: object.h 47254 2007-07-09 10:09:52Z VS $ | |
| 7 | // Copyright: Robert Roebling | |
| 8 | // Licence: wxWindows licence | |
| 9 | ///////////////////////////////////////////////////////////////////////////// | |
| 10 | ||
| 11 | #ifndef _WX_SHARED_PTRH__ | |
| 12 | #define _WX_SHARED_PTRH__ | |
| 13 | ||
| 14 | #include "wx/defs.h" | |
| 15 | #include "wx/atomic.h" | |
| 16 | ||
| 17 | // ---------------------------------------------------------------------------- | |
| 18 | // wxSharedPtr: A smart pointer with non-intrusive reference counting. | |
| 19 | // ---------------------------------------------------------------------------- | |
| 20 | ||
| 21 | template <class T> | |
| 22 | class wxSharedPtr | |
| 23 | { | |
| 24 | public: | |
| 25 | typedef T element_type; | |
| 26 | ||
| 27 | wxEXPLICIT wxSharedPtr( T* ptr = NULL ) | |
| 28 | : m_ref(NULL) | |
| 29 | { | |
| 30 | if (ptr) | |
| 31 | m_ref = new reftype(ptr); | |
| 32 | } | |
| 33 | ||
| 34 | ~wxSharedPtr() { Release(); } | |
| 35 | wxSharedPtr(const wxSharedPtr& tocopy) { Acquire(tocopy.m_ref); } | |
| 36 | ||
| 37 | wxSharedPtr& operator=( const wxSharedPtr& tocopy ) | |
| 38 | { | |
| 39 | if (this != &tocopy) | |
| 40 | { | |
| 41 | Release(); | |
| 42 | Acquire(tocopy.m_ref); | |
| 43 | } | |
| 44 | return *this; | |
| 45 | } | |
| 46 | ||
| 47 | wxSharedPtr& operator=( T* ptr ) | |
| 48 | { | |
| 49 | if (get() != ptr) | |
| 50 | { | |
| 51 | Release(); | |
| 52 | if (ptr) | |
| 53 | m_ref = new reftype(ptr); | |
| 54 | } | |
| 55 | return *this; | |
| 56 | } | |
| 57 | ||
| 58 | T& operator*() const | |
| 59 | { | |
| 60 | wxASSERT(m_ref != NULL); | |
| 61 | wxASSERT(m_ref->m_ptr != NULL); | |
| 62 | return *(m_ref->m_ptr); | |
| 63 | } | |
| 64 | ||
| 65 | T* operator->() const | |
| 66 | { | |
| 67 | wxASSERT(m_ref != NULL); | |
| 68 | wxASSERT(m_ref->m_ptr != NULL); | |
| 69 | return m_ref->m_ptr; | |
| 70 | } | |
| 71 | ||
| 72 | T* get() const | |
| 73 | { | |
| 74 | return m_ref ? m_ref->m_ptr : NULL; | |
| 75 | } | |
| 76 | ||
| 77 | void reset( T* ptr = NULL ) | |
| 78 | { | |
| 79 | Release(); | |
| 80 | if (ptr) | |
| 81 | m_ref = new reftype(ptr); | |
| 82 | } | |
| 83 | ||
| 84 | bool unique() const { return (m_ref ? m_ref->m_count == 1 : true); } | |
| 85 | long use_count() const { return (m_ref ? (long)m_ref->m_count : 0); } | |
| 86 | operator bool() const { return (get() != NULL); } | |
| 87 | ||
| 88 | private: | |
| 89 | ||
| 90 | struct reftype | |
| 91 | { | |
| 92 | reftype( T* ptr = NULL, unsigned count = 1 ) : m_ptr(ptr), m_count(count) {} | |
| 93 | T* m_ptr; | |
| 94 | wxAtomicInt m_count; | |
| 95 | }* m_ref; | |
| 96 | ||
| 97 | void Acquire(reftype* ref) | |
| 98 | { | |
| 99 | m_ref = ref; | |
| 100 | if (ref) | |
| 101 | wxAtomicInc( ref->m_count ); | |
| 102 | } | |
| 103 | ||
| 104 | void Release() | |
| 105 | { | |
| 106 | if (m_ref) | |
| 107 | { | |
| 108 | wxAtomicDec( m_ref->m_count ); | |
| 109 | if (m_ref->m_count == 0) | |
| 110 | { | |
| 111 | delete m_ref->m_ptr; | |
| 112 | delete m_ref; | |
| 113 | } | |
| 114 | m_ref = NULL; | |
| 115 | } | |
| 116 | } | |
| 117 | }; | |
| 118 | ||
| 119 | template <class T, class U> | |
| 120 | bool operator == (wxSharedPtr<T> const &a, wxSharedPtr<U> const &b ) | |
| 121 | { | |
| 122 | return a.get() == b.get(); | |
| 123 | } | |
| 124 | ||
| 125 | template <class T, class U> | |
| 126 | bool operator != (wxSharedPtr<T> const &a, wxSharedPtr<U> const &b ) | |
| 127 | { | |
| 128 | return a.get() != b.get(); | |
| 129 | } | |
| 130 | ||
| 131 | ||
| 132 | ||
| 133 | #endif // _WX_SHARED_PTRH__ |