Method MapValueBuilderImpl

common/values/value_builder.cc:947–950

class MapValueBuilderImpl final : public MapValueBuilder {
 public:
  explicit MapValueBuilderImpl(google::protobuf::Arena* absl_nonnull arena)
      : arena_(arena) {
    map_.Construct(arena_);
  }

  ~MapValueBuilderImpl() override {
    if (!entries_trivially_destructible_) {