762e199741
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18432 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
111 lines
3.2 KiB
TeX
111 lines
3.2 KiB
TeX
\section{\class{wxScopedPtr}}\label{wxscopedptr}
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This is a simple scoped smart pointer implementation that is similar to
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the \urlref{Boost}{http://www.boost.org} smart pointers but rewritten to
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use macros instead.
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\wxheading{Example}
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Below is an example of using a wxWindows scoped smart pointer and
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pointer array.
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\begin{verbatim}
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class MyClass { /* ... */ };
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// declare a smart pointer to a MyClass called wxMyClassPtr
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wxDECLARE_SCOPED_PTR(MyClass, wxMyClassPtr)
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// declare a smart pointer to an array of chars
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wxDECLARE_SCOPED_ARRAY(char, wxCharArray)
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...
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// define the first pointer class, must be complete
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wxDEFINE_SCOPED_PTR(MyClass, wxMyClassPtr)
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// define the second pointer class
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wxDEFINE_SCOPED_ARRAY(char, wxCharArray)
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// create an object with a new pointer to MyClass
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wxMyClassPtr theObj(new MyClass());
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// reset the pointer (deletes the previous one)
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theObj.reset(new MyClass());
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// access the pointer
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theObj->MyFunc();
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// create an object with a new array of chars
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wxCharArray theCharObj(new char[100]);
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// access the array
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theCharObj[0] = "!";
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\end{verbatim}
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\wxheading{Declaring new smart pointer types}
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\begin{verbatim}
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wxDECLAR_SCOPED_PTR( TYPE, // type of the values
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CLASSNAME ); // name of the class
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\end{verbatim}
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A smart pointer holds a pointer to an object (which must be complete
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when wxDEFINE\_SCOPED\_PTR() is called). The memory used by the object is
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deleted when the smart pointer goes out of scope. The first argument
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of the macro is the pointer type, the second is the name of the new
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smart pointer class being created. Below we will use wxScopedPtr to
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represent the scoped pointer class, but the user may create the class with any
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legal name.
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\wxheading{Include files}
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<wx/ptr\_scpd.h>
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\wxheading{See also}
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\helpref{wxScopedArray}{wxscopedarray}\rtfsp
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxScopedPtr::wxScopedPtr}
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\func{}{wxScopedPtr}{\param{type}{ * T = NULL}}
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Creates the smart pointer with the given pointer or none if NULL. On
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compilers that support it, this uses the explicit keyword.
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\membersection{wxScopedPtr::reset}
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\func{\void}{reset}{\param{T}{ p * = NULL}}
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Deletes the currently held pointer and sets it to 'p' or to NULL if no
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arguments are specified. This function does check to make sure that the
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pointer you are assigning is not the same pointer that is already stored.
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\membersection{wxScopedPtr::operator *}
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\func{const T\&}{operator *}{\void}
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This operator works like the standard C++ pointer operator to return the object
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being pointed to by the pointer. If the pointer is NULL or invalid this will
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crash.
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\membersection{wxScopedPtr::operator -\>}
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\func{const T*}{operator -\>}{\void}
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This operator works like the standard C++ pointer operator to return the pointer
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in the smart pointer or NULL if it is empty.
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\membersection{wxScopedPtr::get}
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\func{const T*}{get}{\void}
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This operator gets the pointer stored in the smart pointer or returns NULL if
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there is none.
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\membersection{wxScopedPtr::swap}
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\func{\void}{swap}{\param{wxScopedPtr}{ \& ot}}
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Swap the pointer inside the smart pointer with 'ot'. The pointer being swapped
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must be of the same type (hence the same class name).
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