/src/wxwidgets/include/wx/scopedarray.h
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1 | | ///////////////////////////////////////////////////////////////////////////// |
2 | | // Name: wx/scopedarray.h |
3 | | // Purpose: scoped smart pointer class |
4 | | // Author: Vadim Zeitlin |
5 | | // Created: 2009-02-03 |
6 | | // Copyright: (c) Jesse Lovelace and original Boost authors (see below) |
7 | | // (c) 2009 Vadim Zeitlin |
8 | | // Licence: wxWindows licence |
9 | | ///////////////////////////////////////////////////////////////////////////// |
10 | | |
11 | | #ifndef _WX_SCOPED_ARRAY_H_ |
12 | | #define _WX_SCOPED_ARRAY_H_ |
13 | | |
14 | | #include "wx/defs.h" |
15 | | #include "wx/checkeddelete.h" |
16 | | |
17 | | // ---------------------------------------------------------------------------- |
18 | | // wxScopedArray: A scoped array |
19 | | // ---------------------------------------------------------------------------- |
20 | | |
21 | | template <class T> |
22 | | class wxScopedArray |
23 | | { |
24 | | public: |
25 | | typedef T element_type; |
26 | | |
27 | 0 | explicit wxScopedArray(T * array = nullptr) : m_array(array) { } |
28 | | explicit wxScopedArray(size_t count) : m_array(new T[count]) { } |
29 | | |
30 | 0 | ~wxScopedArray() { delete [] m_array; } |
31 | | |
32 | | // test for pointer validity: defining conversion to unspecified_bool_type |
33 | | // and not more obvious bool to avoid implicit conversions to integer types |
34 | | typedef T *(wxScopedArray<T>::*unspecified_bool_type)() const; |
35 | | operator unspecified_bool_type() const |
36 | | { |
37 | | return m_array ? &wxScopedArray<T>::get : nullptr; |
38 | | } |
39 | | |
40 | | void reset(T *array = nullptr) |
41 | | { |
42 | | if ( array != m_array ) |
43 | | { |
44 | | delete [] m_array; |
45 | | m_array = array; |
46 | | } |
47 | | } |
48 | | |
49 | | T& operator[](size_t n) const { return m_array[n]; } |
50 | | |
51 | | T *get() const { return m_array; } |
52 | | |
53 | | void swap(wxScopedArray &other) |
54 | | { |
55 | | T * const tmp = other.m_array; |
56 | | other.m_array = m_array; |
57 | | m_array = tmp; |
58 | | } |
59 | | |
60 | | private: |
61 | | T *m_array; |
62 | | |
63 | | wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxScopedArray, T); |
64 | | }; |
65 | | |
66 | | // ---------------------------------------------------------------------------- |
67 | | // old macro based implementation |
68 | | // ---------------------------------------------------------------------------- |
69 | | |
70 | | // the same but for arrays instead of simple pointers |
71 | | #define wxDECLARE_SCOPED_ARRAY(T, name)\ |
72 | | class name \ |
73 | | { \ |
74 | | private: \ |
75 | | T * m_ptr; \ |
76 | | name(name const &); \ |
77 | | name & operator=(name const &); \ |
78 | | \ |
79 | | public: \ |
80 | | explicit name(T * p = nullptr) : m_ptr(p) \ |
81 | | {} \ |
82 | | \ |
83 | | ~name(); \ |
84 | | void reset(T * p = nullptr); \ |
85 | | \ |
86 | | T & operator[](long int i) const\ |
87 | | { \ |
88 | | wxASSERT(m_ptr != nullptr); \ |
89 | | wxASSERT(i >= 0); \ |
90 | | return m_ptr[i]; \ |
91 | | } \ |
92 | | \ |
93 | | T * get() const \ |
94 | | { \ |
95 | | return m_ptr; \ |
96 | | } \ |
97 | | \ |
98 | | void swap(name & ot) \ |
99 | | { \ |
100 | | T * tmp = ot.m_ptr; \ |
101 | | ot.m_ptr = m_ptr; \ |
102 | | m_ptr = tmp; \ |
103 | | } \ |
104 | | }; |
105 | | |
106 | | #define wxDEFINE_SCOPED_ARRAY(T, name) \ |
107 | | name::~name() \ |
108 | | { \ |
109 | | wxCHECKED_DELETE_ARRAY(m_ptr); \ |
110 | | } \ |
111 | | void name::reset(T * p){ \ |
112 | | if (m_ptr != p) \ |
113 | | { \ |
114 | | wxCHECKED_DELETE_ARRAY(m_ptr); \ |
115 | | m_ptr = p; \ |
116 | | } \ |
117 | | } |
118 | | |
119 | | #endif // _WX_SCOPED_ARRAY_H_ |
120 | | |