Cleanup

cpp/include/kvikio/utils.hpp

@@ -152,18 +152,16 @@ std::tuple<void*, std::size_t, std::size_t> get_alloc_info(const void* devPtr,
 template <typename T>
 bool is_future_done(const T& future)
 {
-  // If the future does not refer to a valid shared state.
   if (!future.valid()) { return true; }
 
-  // If the future is returned from std::async(std::launch::deferred), its
-  // state is always deferred until wait() is called.
+  // If the future is returned from std::async(std::launch::deferred, ...), its state is always
+  // deferred until wait() is called to make it ready.
   if (future.wait_for(std::chrono::seconds(0)) == std::future_status::deferred) {
     future.wait();
     return true;
   }
 
-  // If the future is returned from std::async(std::launch:async).
-  return future.wait_for(std::chrono::seconds(0)) != std::future_status::timeout;
+  return future.wait_for(std::chrono::seconds(0)) == std::future_status::ready;
 }
 
 #ifdef KVIKIO_CUDA_FOUND