How to generate c++ tags automatically


I used ctags to generate indexes for my local project, but I was looking for something that can automatically update indexes while I coding.
In case, if there isn’t any plug-in to automatically updates indexes, Is there a way to load all the ctags for all my libraries globally? so that I can have autocompletion when I type std:: without having a local copy of my all tags



Thanks! I can use it to navigate in my own project, but it does not support go to std functions implementation.