From 46e8ff63cb67a6520711da5317aaaef04d0414d0 Mon Sep 17 00:00:00 2001
From: Jisi Liu <jisi.liu@gmail.com>
Date: Mon, 5 Oct 2015 11:59:43 -0700
Subject: Down-integrate from google internal.

---
 src/google/protobuf/stubs/stringpiece.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/google/protobuf/stubs/stringpiece.h')

diff --git a/src/google/protobuf/stubs/stringpiece.h b/src/google/protobuf/stubs/stringpiece.h
index 353a60d3..ec3ffd5b 100644
--- a/src/google/protobuf/stubs/stringpiece.h
+++ b/src/google/protobuf/stubs/stringpiece.h
@@ -149,6 +149,7 @@
 #include <string>
 
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/hash.h>
 
 namespace google {
 namespace protobuf {
@@ -437,4 +438,16 @@ extern std::ostream& operator<<(std::ostream& o, StringPiece piece);
 }  // namespace protobuf
 }  // namespace google
 
+GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_START
+template<> struct hash<StringPiece> {
+  size_t operator()(const StringPiece& s) const {
+    size_t result = 0;
+    for (const char *str = s.data(), *end = str + s.size(); str < end; str++) {  
+      result = 5 * result + *str;
+    }
+    return result;
+  }
+};
+GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_END
+
 #endif  // STRINGS_STRINGPIECE_H_
-- 
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