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1\section{\class{wxScopedPtr}}\label{wxscopedptr}
2
3This is a simple scoped smart pointer implementation that is similar to
4the \urlref{Boost}{http://www.boost.org} smart pointers but rewritten to
5use macros instead.
6
7\wxheading{Example}
8
9Below is an example of using a wxWindows scoped smart pointer and
10pointer array.
11
12\begin{verbatim}
13 class MyClass { /* ... */ };
14
15 // declare a smart pointer to a MyClass called wxMyClassPtr
16 wxDECLARE_SCOPED_PTR(MyClass, wxMyClassPtr)
17 // declare a smart pointer to an array of chars
18 wxDECLARE_SCOPED_ARRAY(char, wxCharArray)
19
20 ...
21
22 // define the first pointer class, must be complete
23 wxDEFINE_SCOPED_PTR(MyClass, wxMyClassPtr)
24 // define the second pointer class
25 wxDEFINE_SCOPED_ARRAY(char, wxCharArray)
26
27 // create an object with a new pointer to MyClass
28 wxMyClassPtr theObj(new MyClass());
29 // reset the pointer (deletes the previous one)
30 theObj.reset(new MyClass());
31
32 // access the pointer
33 theObj->MyFunc();
34
35 // create an object with a new array of chars
36 wxCharArray theCharObj(new char[100]);
37
38 // access the array
39 theCharObj[0] = "!";
40\end{verbatim}
41
42\wxheading{Declaring new smart pointer types}
43
44\begin{verbatim}
45 wxDECLAR_SCOPED_PTR( TYPE, // type of the values
46 CLASSNAME ); // name of the class
47\end{verbatim}
48
49A smart pointer holds a pointer to an object (which must be complete
50when wxDEFINE\_SCOPED\_PTR() is called). The memory used by the object is
51deleted when the smart pointer goes out of scope. The first argument
52of the macro is the pointer type, the second is the name of the new
53smart pointer class being created. Below we will use wxScopedPtr to
54represent the scoped pointer class, but the user may create the class with any
55legal name.
56
57\wxheading{Include files}
58
59<wx/ptr\_scpd.h>
60
61\wxheading{See also}
62
63\helpref{wxScopedArray}{wxscopedarray}\rtfsp
64
65\latexignore{\rtfignore{\wxheading{Members}}}
66
67\membersection{wxScopedPtr::wxScopedPtr}
68
69\func{}{wxScopedPtr}{\param{type}{ * T = NULL}}
70
71Creates the smart pointer with the given pointer or none if NULL. On
72compilers that support it, this uses the explicit keyword.
73
74\membersection{wxScopedPtr::release}
75
76\func{T *}{release}{\void}
77
78Returns the currently hold pointer and resets the smart pointer object to
79{\tt NULL}. After a call to this function the caller is responsible for
80deleting the pointer.
81
82
83\membersection{wxScopedPtr::reset}
84
85\func{\void}{reset}{\param{T}{ p * = NULL}}
86
87Deletes the currently held pointer and sets it to {\it p} or to NULL if no
88arguments are specified. This function does check to make sure that the
89pointer you are assigning is not the same pointer that is already stored.
90
91\membersection{wxScopedPtr::operator *}
92
93\func{const T\&}{operator *}{\void}
94
95This operator works like the standard C++ pointer operator to return the object
96being pointed to by the pointer. If the pointer is NULL or invalid this will
97crash.
98
99\membersection{wxScopedPtr::operator -$>$} % TODO
100
101\func{const T*}{operator -$>$}{\void} % TODO
102
103This operator works like the standard C++ pointer operator to return the pointer
104in the smart pointer or NULL if it is empty.
105
106\membersection{wxScopedPtr::get}
107
108\func{const T*}{get}{\void}
109
110This operator gets the pointer stored in the smart pointer or returns NULL if
111there is none.
112
113\membersection{wxScopedPtr::swap}
114
115\func{\void}{swap}{\param{wxScopedPtr}{ \& other}}
116
117Swap the pointer inside the smart pointer with {\it other}. The pointer being
118swapped must be of the same type (hence the same class name).
119