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Restored Objective-C typesafety while retaining proper C++ name mangling

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21005 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
David Elliott
2003-06-08 03:25:42 +00:00
parent 085c39b402
commit 6444e22daa
1 changed files with 26 additions and 1 deletions
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27
include/wx/defs.h
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@@ -1911,14 +1911,39 @@ typedef ControlHandle WXWidget;
#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
// 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(NSBox);
DECLARE_WXCOCOA_OBJC_CLASS(NSButton);