From 1c32292c7be078303f4bb59e635319773c5012c2 Mon Sep 17 00:00:00 2001
From: Vijay Pai <vpai@google.com>
Date: Mon, 11 Sep 2017 09:05:59 -0700
Subject: [PATCH] Address reviewer comments

---
 include/grpc++/impl/codegen/call.h | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/include/grpc++/impl/codegen/call.h b/include/grpc++/impl/codegen/call.h
index bbd277f288f..0bf33cb88f1 100644
--- a/include/grpc++/impl/codegen/call.h
+++ b/include/grpc++/impl/codegen/call.h
@@ -303,14 +303,18 @@ class CallOpSendMessage {
   WriteOptions write_options_;
 };
 
+namespace internal {
+template <class T>
+T Example();
+}  // namespace internal
+
 template <class M>
 class CallOpSendMessage::MessageSerializer<
     M, typename std::enable_if<std::is_same<
-           ::grpc::Status,
-           decltype(SerializationTraits<M>::Serialize(
-               static_cast<const M&>(*(static_cast<const M*>(nullptr))),
-               static_cast<grpc_byte_buffer**>(nullptr),
-               static_cast<bool*>(nullptr)))>::value>::type> {
+           ::grpc::Status, decltype(SerializationTraits<M>::Serialize(
+                               internal::Example<const M&>(),
+                               internal::Example<grpc_byte_buffer**>(),
+                               internal::Example<bool*>()))>::value>::type> {
  public:
   static Status SendMessageInternal(const M& message, ByteBuffer* bbuf,
                                     bool* own_buf) {
@@ -322,11 +326,10 @@ class CallOpSendMessage::MessageSerializer<
 template <class M>
 class CallOpSendMessage::MessageSerializer<
     M, typename std::enable_if<std::is_same<
-           ::grpc::Status,
-           decltype(SerializationTraits<M>::Serialize(
-               static_cast<const M&>(*(static_cast<const M*>(nullptr))),
-               static_cast<::grpc::ByteBuffer*>(nullptr),
-               static_cast<bool*>(nullptr)))>::value>::type> {
+           ::grpc::Status, decltype(SerializationTraits<M>::Serialize(
+                               internal::Example<const M&>(),
+                               internal::Example<::grpc::ByteBuffer*>(),
+                               internal::Example<bool*>()))>::value>::type> {
  public:
   static Status SendMessageInternal(const M& message, ByteBuffer* bbuf,
                                     bool* own_buf) {