Method complete

src/test/ObjectMap/KeyValueDBMemory.h:143–150

    }

    int complete() {
      for (auto i = on_commit.begin();
	   i != on_commit.end();
	   on_commit.erase(i++)) {
	(*i)->complete(0);
      }
      return 0;
    }

    ~TransactionImpl_() override {
      for (auto i = on_commit.begin();