It seem to be impossible for now. You can find a discussion about “Intersection” type in python/typing#123 repository. There is a similar feature on PEP-544 called Protocol, and you can merge mixins by merging mixin protocols. There is an implementation of PEP-544 called typing_extensions. Maybe you can try that with this library.
For “handle” types (opaque pointers), Microsoft uses the trick of declaring structures and then typedef’ing a pointer to the structure: #define DECLARE_HANDLE(name) struct name##__ { int unused; }; \ typedef struct name##__ *name Then instead of typedef void* FOOHANDLE; typedef void* BARHANDLE; They do: DECLARE_HANDLE(FOOHANDLE); DECLARE_HANDLE(BARHANDLE); So now, this works: FOOHANDLE make_foo(); BARHANDLE make_bar(); void … Read more
You can use a helper class to fine tune specializations: template <typename F> struct wrapper {}; template <typename Res, typename… Args> struct wrapper<Res(Args…)> { static Res wrap(Res (WINAPI *f)(Args…), Args&& args…) { Res r = f(std::forward<Args>(args)…); // Blah blah return r; } }; template <typename… Args> struct wrapper<void(Args…)> { static void wrap(void (WINAPI *f)(Args…), Args&& … Read more
The error message says it all. At runtime, the type is gone, there is no way to check for it. You could catch it by making a factory for your object like this: public static <T> MyObject<T> createMyObject(Class<T> type) { return new MyObject<T>(type); } And then in the object’s constructor store that type, so variable … Read more
What happens if somebody passes a unicode string to your function? Or a class derived from dict? Or a class implementing a dict-like interface? Following code covers first two cases. If you are using Python 2.6 you might want to use collections.Mapping instead of dict as per the ABC PEP. def value_list(x): if isinstance(x, dict): … Read more
Swift 3 version: type(of: yourObject)