use wx_static_cast() inside wxDynamicCast to catch impossible casts at compile-time instead of run-time

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26832 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -92,6 +92,9 @@ OTHER CHANGES
 All:
 
 - Hindi translations added (Dhananjaya Sharma)
+- wxDynamicCast() now uses static_cast<wxObject *> internally and so using it
+  with anything not deriving from wxObject will fail at compile time (instead
+  of run-time) now
 
 All (GUI):
 

include/wx/object.h

@@ -333,7 +333,10 @@ name##PluginSentinel  m_pluginsentinel;
 
 // to be replaced by dynamic_cast<> in the future
 #define wxDynamicCast(obj, className) \
- ((className *) wxCheckDynamicCast((wxObject*)(obj), &className::ms_classInfo))
+    ((className *) wxCheckDynamicCast( \
+        wx_const_cast(wxObject *, wx_static_cast(const wxObject *, \
+          wx_const_cast(className *, wx_static_cast(const className *, obj)))), \
+        &className::ms_classInfo))
 
 // The 'this' pointer is always true, so use this version
 // to cast the this pointer and avoid compiler warnings.