chore: import upstream snapshot with attribution

cpp/include/ray/api/wait_result.h

@@ -0,0 +1,37 @@
+// Copyright 2020-2021 The Ray Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <ray/api/object_ref.h>
+
+#include <list>
+
+namespace ray {
+
+/// \param T The type of object.
+template <typename T>
+class WaitResult {
+ public:
+  /// The object id list of ready objects
+  std::list<ObjectRef<T>> ready;
+  /// The object id list of unready objects
+  std::list<ObjectRef<T>> unready;
+  WaitResult(){};
+  WaitResult(std::list<ObjectRef<T>> &&ready_objects,
+             std::list<ObjectRef<T>> &&unready_objects)
+      : ready(ready_objects), unready(unready_objects){};
+};
+
+}  // namespace ray