I remember being a little impressed when in some version of C++ Builder i used a symbol from another source file and when i pressed Ctrl+S to save it, the edito

I remember being a little impressed when in some version of C++ Builder i used a symbol from another source file and when i pressed Ctrl+S to save it, the editor automatically added the necessary #include file at the top. This is the mark of an IDE that actually knows the language it is editing. The closest i've seen elsewhere is QtCreator littering the code with red error messages about the unknown symbol while i'm typing the code together with a lightbulb next to the line with it which, if i click on, it adds the #include. From a technical perspective the ability seems to be there, it just doesn't feel as smooth and seamless. Not to mention all these errors that appear while i'm typing make me anxious - like, STFU, i know the code is wrong, i'll fix it once i finish typing this part :-P.