Remove a small allocation, at the cost of a little uglier header file.

This commit may or may not be a great tradeoff.

1 files changed, 14 insertions, 0 deletions

diff --git a/include/grpc++/alarm.h b/include/grpc++/alarm.h
index f0ab546cb2..9979c34e4f 100644
--- a/include/grpc++/alarm.h
+++ b/include/grpc++/alarm.h
@@ -36,6 +36,7 @@
 #ifndef GRPCXX_ALARM_H
 #define GRPCXX_ALARM_H
 
+#include <grpc++/impl/codegen/completion_queue_tag.h>
 #include <grpc++/impl/codegen/grpc_library.h>
 #include <grpc++/impl/codegen/time.h>
 
@@ -63,6 +64,19 @@ class Alarm : private GrpcLibrary {
   void Cancel();
 
  private:
+  class AlarmEntry : public CompletionQueueTag {
+   public:
+    AlarmEntry(void* tag) : tag_(tag) {}
+    bool FinalizeResult(void** tag, bool* status) GRPC_OVERRIDE {
+      *tag = tag_;
+      return true;
+    }
+
+   private:
+    void* tag_;
+  };
+
+  AlarmEntry tag_;
   grpc_alarm* const alarm_;  // owned
 };