it seems that we don't have a c++ client sdk here, do we? In my senario, I might use c++ to build my web server that connected to typesense for fully control over latency and memory cost

Don't have an official SDK but you can check core_api.h which maps all public APIs. So you can just use that directly.

was there any plan supporting c++ client sdk? If so, I would like to contribute to the project when I finish

So far we have not had any asks, understandably because most people integrate via API from web app or mobile apps so that largely rules out CPP :)

got it