diff --git a/lib/cpp/src/TReflectionLocal.h b/lib/cpp/src/TReflectionLocal.h
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+++ b/lib/cpp/src/TReflectionLocal.h
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef _THRIFT_TREFLECTIONLOCAL_H_
+#define _THRIFT_TREFLECTIONLOCAL_H_ 1
+
+#include <stdint.h>
+#include <cstring>
+#include <protocol/TProtocol.h>
+
+/**
+ * Local Reflection is a blanket term referring to the the structure
+ * and generation of this particular representation of Thrift types.
+ * (It is called local because it cannot be serialized by Thrift).
+ *
+ */
+
+namespace apache { namespace thrift { namespace reflection { namespace local {
+
+using apache::thrift::protocol::TType;
+
+// We include this many bytes of the structure's fingerprint when serializing
+// a top-level structure.  Long enough to make collisions unlikely, short
+// enough to not significantly affect the amount of memory used.
+const int FP_PREFIX_LEN = 4;
+
+struct FieldMeta {
+  int16_t tag;
+  bool is_optional;
+};
+
+struct TypeSpec {
+  TType ttype;
+  uint8_t    fp_prefix[FP_PREFIX_LEN];
+
+  // Use an anonymous union here so we can fit two TypeSpecs in one cache line.
+  union {
+    struct {
+      // Use parallel arrays here for denser packing (of the arrays).
+      FieldMeta* metas;
+      TypeSpec** specs;
+    } tstruct;
+    struct {
+      TypeSpec *subtype1;
+      TypeSpec *subtype2;
+    } tcontainer;
+  };
+
+  // Static initialization of unions isn't really possible,
+  // so take the plunge and use constructors.
+  // Hopefully they'll be evaluated at compile time.
+
+  TypeSpec(TType ttype) : ttype(ttype) {
+    std::memset(fp_prefix, 0, FP_PREFIX_LEN);
+  }
+
+  TypeSpec(TType ttype,
+           const uint8_t* fingerprint,
+           FieldMeta* metas,
+           TypeSpec** specs) :
+    ttype(ttype)
+  {
+    std::memcpy(fp_prefix, fingerprint, FP_PREFIX_LEN);
+    tstruct.metas = metas;
+    tstruct.specs = specs;
+  }
+
+  TypeSpec(TType ttype, TypeSpec* subtype1, TypeSpec* subtype2) :
+    ttype(ttype)
+  {
+    std::memset(fp_prefix, 0, FP_PREFIX_LEN);
+    tcontainer.subtype1 = subtype1;
+    tcontainer.subtype2 = subtype2;
+  }
+
+};
+
+}}}} // apache::thrift::reflection::local
+
+#endif // #ifndef _THRIFT_TREFLECTIONLOCAL_H_