* This is very similar to simcall() right above, but the calling actor will not get rescheduled until
* actor->simcall_answer() is called explicitely.
*
+ * Since the return value does not come from the lambda directly, its type cannot be guessed automatically and must
+ * be provided as template parameter.
+ *
* This is meant for blocking actions. For example, locking a mutex is a blocking simcall.
* First it's a simcall because that's obviously a modification of the world. Then, that's a blocking simcall because if
* the mutex happens not to be free, the actor is added to a queue of actors in the mutex. Every mutex->unlock() takes
*
* If your code never calls actor->simcall_answer() itself, the actor will never return from its simcall.
*/
-template <class F> typename std::result_of<F()>::type simcall_blocking(F&& code, mc::SimcallInspector* t = nullptr)
+template <class R, class F> R simcall_blocking(F&& code, mc::SimcallInspector* t = nullptr)
{
// If we are in the maestro, we take the fast path and execute the
// code directly without simcall mashalling/unmarshalling/dispatch:
// If we are in the application, pass the code to the maestro which
// executes it for us and reports the result. We use a std::future which
// conveniently handles the success/failure value for us.
- typedef typename std::result_of<F()>::type R;
simgrid::xbt::Result<R> result;
simcall_run_blocking([&result, &code] { simgrid::xbt::fulfill_promise(result, std::forward<F>(code)); }, t);
return result.get();
