nearby: snapshot as of cl/296436629

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I2cf5bf225b76f4c1541954651f3a7544a14e0cec

cpp/platform/api/settable_future.h

@@ -0,0 +1,23 @@
+#ifndef PLATFORM_API_SETTABLE_FUTURE_H_
+#define PLATFORM_API_SETTABLE_FUTURE_H_
+
+#include "platform/api/future.h"
+
+namespace location {
+namespace nearby {
+
+// A SettableFuture is a type of Future whose result can be set.
+//
+// https://google.github.io/guava/releases/20.0/api/docs/com/google/common/util/concurrent/SettableFuture.html
+template <typename T>
+class SettableFuture : public Future<T> {
+ public:
+  ~SettableFuture() override {}
+
+  virtual bool set(T value) = 0;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_API_SETTABLE_FUTURE_H_