A vim script that does this can be found here: script#5545, and is called CurtineIncSw.vim. * Ease of use. * Zero configuration, just put the file in your ~/.vim/plugins directory * Available on github, feel free to contribute * Works with different extension styles (.C .c .cxx .cpp .CPP, .cc <--> .h .hpp .H .HPP) all at the same time - a switch will work from any source to any header extension and vice-versa. * Simple implementation * Caches file, so you can switch back quickly