Remove HashStr and HashStringPiece (a one-off).

Now that we have tensorflow::hash and it's the default hasher for
FlatMap and FlatSet, we can get rid of HashStr and HashStringPiece.

PiperOrigin-RevId: 161560034

1 files changed, 11 insertions, 7 deletions

diff --git a/tensorflow/core/lib/hash/hash.h b/tensorflow/core/lib/hash/hash.h
index b45391fac5..73b7c94d1f 100644
--- a/tensorflow/core/lib/hash/hash.h
+++ b/tensorflow/core/lib/hash/hash.h
@@ -23,6 +23,7 @@ limitations under the License.
 
 #include <string>
 
+#include "tensorflow/core/lib/core/stringpiece.h"
 #include "tensorflow/core/platform/types.h"
 
 namespace tensorflow {
@@ -42,12 +43,6 @@ inline uint64 Hash64Combine(uint64 a, uint64 b) {
   return a ^ (b + 0x9e3779b97f4a7800ULL + (a << 10) + (a >> 4));
 }
 
-struct HashStr {
-  size_t operator()(const string& s) const {
-    return static_cast<size_t>(Hash64(s));
-  }
-};
-
 // Hash functor suitable for use with power-of-two sized hashtables.  Use
 // instead of std::hash<T>.
 //
@@ -70,7 +65,16 @@ struct hash<T*> {
 
 template <>
 struct hash<string> {
-  size_t operator()(const string& s) const { return HashStr()(s); }
+  size_t operator()(const string& s) const {
+    return static_cast<size_t>(Hash64(s));
+  }
+};
+
+template <>
+struct hash<StringPiece> {
+  size_t operator()(StringPiece sp) const {
+    return static_cast<size_t>(Hash64(sp.data(), sp.size()));
+  }
 };
 
 }  // namespace tensorflow