You could always write your own program to do it. The syntax elements in C++ shouldn't be that difficult to deal with.
Not really... with some functions with many parameters, and/or long names, ideally, I would like to simply highlight them, hit a hot-key, and convert it from one format to the other. Visual C++ does have an auto-format hotkey, but it does not handle this case.
Sometimes, the function may already have multi-lines, and I would prefer to condense it back down to a single line. Doing it manually is tedious, hence I am looking for a solution.
As for doing it myself, I fear that it would defeat the point of trying to save time, especially if a solution already exists. It's always better to not re-invent the wheel when possible :D :D :D
Indeed, I do use Artistic Style (astyle) as mentioned above, but as far as I know, it does not contain an option for making long function calls multi-line. If there is an option to do that, I'd love to hear about it. I LOVE Artistic Style :D