+#ifdef __WXCOCOA__
+
+// NOTE: This ought to work with other compilers too, but I'm being cautious
+#if defined(__GNUC__) && defined(__APPLE__)
+/* It's desirable to have type safety for Objective-C(++) code as it does
+at least catch typos of method names among other things. However, it
+is not possible to declare an Objective-C class from plain old C or C++
+code. Furthermore, because of C++ name mangling, the type name must
+be the same for both C++ and Objective-C++ code. Therefore, we define
+what should be a pointer to an Objective-C class as a pointer to a plain
+old C struct with the same name. Unfortunately, because the compiler
+does not see a struct as an Objective-C class we cannot declare it
+as a struct in Objective-C(++) mode.
+*/
+#if defined(__OBJC__)
+#define DECLARE_WXCOCOA_OBJC_CLASS(klass) \
+@class klass; \
+typedef klass *WX_##klass
+#else // not defined(__OBJC__)
+#define DECLARE_WXCOCOA_OBJC_CLASS(klass) \
+typedef struct klass *WX_##klass
+#endif // defined(__OBJC__)
+
+#else // not GNU
+#warning "Objective-C types will not be checked by the compiler."
+// NOTE: typedef struct objc_object *id;
+// IOW, we're declaring these using the id type without using that name,
+// since "id" is used extensively not only within wxWindows itself, but
+// also in wxWindows application code. The following works fine when
+// compiling C(++) code, and works without typesafety for Obj-C(++) code
+#define DECLARE_WXCOCOA_OBJC_CLASS(klass) \
+typedef struct objc_object *WX_##klass
+
+#endif // defined(__GNUC__) && defined(__APPLE__)
+
+DECLARE_WXCOCOA_OBJC_CLASS(NSApplication);
+DECLARE_WXCOCOA_OBJC_CLASS(NSBitmapImageRep);
+DECLARE_WXCOCOA_OBJC_CLASS(NSBox);
+DECLARE_WXCOCOA_OBJC_CLASS(NSButton);
+DECLARE_WXCOCOA_OBJC_CLASS(NSColor);
+DECLARE_WXCOCOA_OBJC_CLASS(NSControl);
+DECLARE_WXCOCOA_OBJC_CLASS(NSEvent);
+DECLARE_WXCOCOA_OBJC_CLASS(NSImage);
+DECLARE_WXCOCOA_OBJC_CLASS(NSLayoutManager);
+DECLARE_WXCOCOA_OBJC_CLASS(NSMenu);
+DECLARE_WXCOCOA_OBJC_CLASS(NSMenuItem);
+DECLARE_WXCOCOA_OBJC_CLASS(NSPanel);
+DECLARE_WXCOCOA_OBJC_CLASS(NSTableView);
+DECLARE_WXCOCOA_OBJC_CLASS(NSTextContainer);
+DECLARE_WXCOCOA_OBJC_CLASS(NSTextField);
+DECLARE_WXCOCOA_OBJC_CLASS(NSTextStorage);
+DECLARE_WXCOCOA_OBJC_CLASS(NSThread);
+DECLARE_WXCOCOA_OBJC_CLASS(NSWindow);
+DECLARE_WXCOCOA_OBJC_CLASS(NSView);
+typedef WX_NSView WXWidget; // wxWindows BASE definition
+#endif // __WXCOCOA__
+