update code

include/google/protobuf/metadata.h

@@ -0,0 +1,78 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// This header file defines an internal class that encapsulates internal message
+// metadata (Unknown-field set, Arena pointer, ...) and allows its
+// representation to be made more space-efficient via various optimizations.
+//
+// Note that this is distinct from google::protobuf::Metadata, which encapsulates
+// Descriptor and Reflection pointers.
+
+#ifndef GOOGLE_PROTOBUF_METADATA_H__
+#define GOOGLE_PROTOBUF_METADATA_H__
+
+#include <google/protobuf/metadata_lite.h>
+#include <google/protobuf/unknown_field_set.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+class InternalMetadataWithArena
+    : public InternalMetadataWithArenaBase<UnknownFieldSet,
+                                           InternalMetadataWithArena> {
+ public:
+  InternalMetadataWithArena() {}
+  explicit InternalMetadataWithArena(Arena* arena)
+      : InternalMetadataWithArenaBase<UnknownFieldSet,
+                                           InternalMetadataWithArena>(arena) {}
+
+  void DoSwap(UnknownFieldSet* other) {
+    mutable_unknown_fields()->Swap(other);
+  }
+
+  void DoMergeFrom(const UnknownFieldSet& other) {
+    mutable_unknown_fields()->MergeFrom(other);
+  }
+
+  void DoClear() {
+    mutable_unknown_fields()->Clear();
+  }
+
+  static const UnknownFieldSet& default_instance() {
+    return *UnknownFieldSet::default_instance();
+  }
+};
+
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_METADATA_H__