nearby sdk refactor

PiperOrigin-RevId: 425434260

internal/platform/implementation/cancelable.h

@@ -0,0 +1,35 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_API_CANCELABLE_H_
+#define PLATFORM_API_CANCELABLE_H_
+
+namespace location {
+namespace nearby {
+namespace api {
+
+// An interface to provide a cancellation mechanism for objects that represent
+// long-running operations.
+class Cancelable {
+ public:
+  virtual ~Cancelable() = default;
+
+  virtual bool Cancel() = 0;
+};
+
+}  // namespace api
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_API_CANCELABLE_H_