Casting to a C++11 lambda doesn't really make any sense; each lambda function is a unique anonymous type. There's also no need to do any casting to use an Obj-C

Casting to a C++11 lambda doesn't really make any sense; each lambda function is a unique anonymous type. There's also no need to do any casting to use an Obj-C block anywhere that you can use a C++11 lambda, since they obviously already implement the Callable concept.