diff options
Diffstat (limited to 'OpenAL32/Include/alMain.h')
| -rw-r--r-- | OpenAL32/Include/alMain.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h index ad305c4e..8b66e4e7 100644 --- a/OpenAL32/Include/alMain.h +++ b/OpenAL32/Include/alMain.h @@ -348,8 +348,15 @@ static const union { #define DERIVE_FROM_TYPE(t) t t##_parent #define STATIC_CAST(to, obj) (&(obj)->to##_parent) +#ifdef __GNUC__ +#define STATIC_UPCAST(to, from, obj) __extension__({ \ + static_assert(__builtin_types_compatible_p(from, __typeof(*(obj))), \ + "Invalid upcast object from type"); \ + (to*)((char*)(obj) - offsetof(to, from##_parent)); \ +}) +#else #define STATIC_UPCAST(to, from, obj) ((to*)((char*)(obj) - offsetof(to, from##_parent))) - +#endif #define DECLARE_FORWARD(T1, T2, rettype, func) \ rettype T1##_##func(T1 *obj) \ |