The interviewer was indifferent and did not try to guide you through the question even though you are apparently lost about the question.
You need to be very well prepared for fundamental stuff in computer science/engineering.
What is the low-level implementation of virtual functions in C++?
The following metrics were computed from 1 interview experience for the Tencent Game Developer role in Germany.
Tencent's interview process for their Game Developer roles in Germany is extremely selective, failing the vast majority of engineers.
Candidates reported having very negative feelings for Tencent's Game Developer interview process in Germany.