From b6f853d0658397ad13c3fb6032114fa179738c70 Mon Sep 17 00:00:00 2001
From: yang-g <yangg@google.com>
Date: Tue, 10 May 2016 13:10:25 -0700
Subject: [PATCH] Add comment

---
 include/grpc++/impl/codegen/call.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/grpc++/impl/codegen/call.h b/include/grpc++/impl/codegen/call.h
index c10c834b040..d457f03fa64 100644
--- a/include/grpc++/impl/codegen/call.h
+++ b/include/grpc++/impl/codegen/call.h
@@ -329,6 +329,8 @@ class CallOpGenericRecvMessage {
 
   template <class R>
   void RecvMessage(R* message) {
+    // Use an explicit base class pointer to avoid resolution error in the
+    // following unique_ptr::reset for some old implementations.
     CallOpGenericRecvMessageHelper::DeserializeFunc* func =
         new CallOpGenericRecvMessageHelper::DeserializeFuncType<R>(message);
     deserialize_.reset(func);