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[wxWidgets.git] / docs / latex / wx / truntime.tex

diff --git a/docs/latex/wx/truntime.tex b/docs/latex/wx/truntime.tex
index 2d1da9c0217ddd3f4c8c3ecb01c89473e49a231d..a0dc67d8d3b18687994a002ce2cb2a70bdaec660 100644 (file)
--- a/docs/latex/wx/truntime.tex
+++ b/docs/latex/wx/truntime.tex
@@ -2,16 +2,31 @@
 
 Classes: \helpref{wxObject}{wxobject}, \helpref{wxClassInfo}{wxclassinfo}.
 
 
 Classes: \helpref{wxObject}{wxobject}, \helpref{wxClassInfo}{wxclassinfo}.
 

-One of the failings of C++ is that no run-time information is provided
+One of the failings of C++ used to be that no run-time information was provided

 about a class and its position in the inheritance hierarchy.
 about a class and its position in the inheritance hierarchy.

-Another is that instances of a class cannot be created just by knowing the name of a class,
-which makes facilities such as persistent storage hard to implement.
+Another, which still persists, is that instances of a class cannot be created
+just by knowing the name of a class, which makes facilities such as persistent
+storage hard to implement.

 
 Most C++ GUI frameworks overcome these limitations by means of a set of
 
 Most C++ GUI frameworks overcome these limitations by means of a set of

-macros and functions and wxWindows (from version 1.62) is no exception.
+macros and functions and wxWindows is no exception. As it originated before the
+addition of RTTI to the standard C++ and as support for it still missing from
+some (albeit old) compilers, wxWindows doesn't (yet) use it, but provides its
+own macro-based RTTI system.
+
+In the future, the standard C++ RTTI will be used though and you're encouraged
+to use whenever possible \helpref{wxDynamicCast()}{wxdynamiccast} macro which,
+for the implementations that support it, is defined just as dynamic\_cast<> and
+uses wxWindows RTTI for all the others. This macro is limited to wxWindows
+classes only and only works with pointers (unlike the real dynamic\_cast<> which
+also accepts references).
+

 Each class that you wish to be known the type system should have
 a macro such as DECLARE\_DYNAMIC\_CLASS just inside the class declaration.
 The macro IMPLEMENT\_DYNAMIC\_CLASS should be in the implementation file.
 Each class that you wish to be known the type system should have
 a macro such as DECLARE\_DYNAMIC\_CLASS just inside the class declaration.
 The macro IMPLEMENT\_DYNAMIC\_CLASS should be in the implementation file.

+Note that these are entirely optional; use them if you wish to check object
+types, or create instances of classes using the class name. However,
+it is good to get into the habit of adding these macros for all classes.

 
 Variations on these \helpref{macros}{macros} are used for multiple inheritance, and abstract
 classes that cannot be instantiated dynamically or otherwise.
 
 Variations on these \helpref{macros}{macros} are used for multiple inheritance, and abstract
 classes that cannot be instantiated dynamically or otherwise.


@@ -28,9 +43,9 @@ dynamic object of the class in question. A pointer to this function is
 stored in wxClassInfo, and is used when an object should be created
 dynamically.
 
 stored in wxClassInfo, and is used when an object should be created
 dynamically.
 

-wxObject::IsKindOf uses the linked list of wxClassInfo. It takes
-a wxClassInfo argument, so use CLASSINFO(className) to return an
-appropriate wxClassInfo pointer to use in this function.
+\helpref{wxObject::IsKindOf}{wxobjectiskindof} uses the linked list of
+wxClassInfo. It takes a wxClassInfo argument, so use CLASSINFO(className)
+to return an appropriate wxClassInfo pointer to use in this function.

 
 The function \helpref{wxCreateDynamicObject}{wxcreatedynamicobject} can be used
 to construct a new object of a given type, by supplying a string name.
 
 The function \helpref{wxCreateDynamicObject}{wxcreatedynamicobject} can be used
 to construct a new object of a given type, by supplying a string name.


@@ -65,26 +80,27 @@ See also \helpref{wxObject}{wxobject} and \helpref{wxCreateDynamicObject}{wxcrea
 
 \subsection{Example}
 
 
 \subsection{Example}
 

-In a header file wx\_frame.h:
+In a header file frame.h:

 
 \begin{verbatim}
 
 \begin{verbatim}

-class wxFrame: public wxWindow
+class wxFrame : public wxWindow

 {
 {

-  DECLARE_DYNAMIC_CLASS(wxFrame)
+DECLARE_DYNAMIC_CLASS(wxFrame)
+
+private:
+    wxString m_title;

 
 

- private:
-  char *frameTitle;
- public:
-  ...
+public:
+    ...

 };
 \end{verbatim}
 
 };
 \end{verbatim}
 

-In a C++ file wx\_frame.cc:
+In a C++ file frame.cpp:

 
 \begin{verbatim}
 IMPLEMENT_DYNAMIC_CLASS(wxFrame, wxWindow)
 
 
 \begin{verbatim}
 IMPLEMENT_DYNAMIC_CLASS(wxFrame, wxWindow)
 

-wxFrame::wxFrame(void)
+wxFrame::wxFrame()

 {
 ...
 }
 {
 ...
 }