@JKSH Hi! I came across this too. I feel that it has worked for me in the past, e.g. using a simple std::vector<QString> and then expecting code completion on typing myVector[0]. But it's not working in QtCreator 3.4.0, not even with the plugin you mentioned... Anything else I can try? EDIT: Nevermind, found out that I have to enable it in the preferences too... it's working but a bit slow...