third_party/protobuf/3.6.1/src/google/protobuf/metadata.h

// Protocol Buffers - Google's data interchange format
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// 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__