nearby: snapshot of cl/304428753

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I0023ac6e40456fc4a8169c3173bcbff3b5ccc476

cpp/platform/api2/settable_future.h

@@ -0,0 +1,24 @@
+#ifndef PLATFORM_API2_SETTABLE_FUTURE_H_
+#define PLATFORM_API2_SETTABLE_FUTURE_H_
+
+#include "platform/api2/listenable_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 ListenableFuture<T> {
+ public:
+  ~SettableFuture() override = default;
+
+  virtual bool Set(const T& value) = 0;
+  virtual bool SetException(Exception exception) = 0;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_API2_SETTABLE_FUTURE_H_