From deb3d2255dac7da1131a40bc028fbdc977a43e44 Mon Sep 17 00:00:00 2001
From: yang-g <yangg@google.com>
Date: Tue, 1 Sep 2015 12:51:28 -0700
Subject: [PATCH] Add missed header

---
 src/cpp/util/string_ref.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/cpp/util/string_ref.cc b/src/cpp/util/string_ref.cc
index 9adc0920135..c42033f61fe 100644
--- a/src/cpp/util/string_ref.cc
+++ b/src/cpp/util/string_ref.cc
@@ -36,6 +36,7 @@
 #include <string.h>
 
 #include <algorithm>
+#include <iostream>
 
 namespace grpc {