[alohalytics] Moved reusable NoOpDeleter into event_base.h

3party/Alohalytics/src/cpp/alohalytics.cc

@@ -52,12 +52,6 @@ namespace alohalytics {
 
 static constexpr const char * kAlohalyticsHTTPContentType = "application/alohalytics-binary-blob";
 
-// Used for cereal smart-pointers polymorphic serialization.
-struct NoOpDeleter {
-  template <typename T>
-  void operator()(T *) {}
-};
-
 // Use alohalytics::Stats::Instance() to access statistics engine.
 Stats::Stats()
     : messages_queue_(

3party/Alohalytics/src/event_base.h

@@ -39,6 +39,15 @@
 
 #include "location.h"
 
+// Small helper, used for cereal smart-pointers polymorphic serialization.
+// TODO(AlexZ): Remove it later together with Cereal.
+namespace alohalytics {
+struct NoOpDeleter {
+  template <typename T>
+  void operator()(T *) {}
+};
+}  // namespace alohalytics
+
 // For easier processing on a server side, every statistics event should derive from this base class.
 struct AlohalyticsBaseEvent {
   uint64_t timestamp;