From d36c0c538a545fac5d9db6ba65c525246d4efa95 Mon Sep 17 00:00:00 2001
From: Feng Xiao <xfxyjwf@gmail.com>
Date: Wed, 29 Mar 2017 14:32:48 -0700
Subject: Down-integrate from google3.

---
 src/google/protobuf/arenastring.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/google/protobuf/arenastring.h')

diff --git a/src/google/protobuf/arenastring.h b/src/google/protobuf/arenastring.h
index a7efb752..63fd00e5 100755
--- a/src/google/protobuf/arenastring.h
+++ b/src/google/protobuf/arenastring.h
@@ -310,5 +310,21 @@ struct LIBPROTOBUF_EXPORT ArenaStringPtr {
 
 
 
+namespace protobuf {
+namespace internal {
+
+inline void ArenaStringPtr::AssignWithDefault(const ::std::string* default_value,
+                                       ArenaStringPtr value) {
+  const ::std::string* me = *UnsafeRawStringPointer();
+  const ::std::string* other = *value.UnsafeRawStringPointer();
+  // If the pointers are the same then do nothing.
+  if (me != other) {
+    SetNoArena(default_value, value.GetNoArena());
+  }
+}
+
+}  // namespace internal
+}  // namespace protobuf
+
 }  // namespace google
 #endif  // GOOGLE_PROTOBUF_ARENASTRING_H__
-- 
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