If you have a tags file set up, vim omnicomplete (<C-x><C-o>) for C and C++ (at least) will also be able to complete struct/class members and other context sens

If you have a tags file set up, vim omnicomplete (<C-x><C-o>) for C and C++ (at least) will also be able to complete struct/class members and other context sensitive. Additionally, I set the user complete mode (<C-x><C-u>) to use vim's built in syntax complete (`:set completefunc=syntaxcomplete#Complete`), which is super helpful with e.g. config files because Vim is aware of all the available completion options. Of course there's filename complete too (<C-x><C-f>). These three modes can get some intelligent completion done but quite frankly the default local keyword completion covers 90% of my use cases.