Quote Originally Posted by superbonzo View Post
taken by a sudden spirit of rebellion I reread the paragraph on for_each and it (implicitly) allows side effects on its functor argument... mah...

I feel your pain. I wonder why the C++ standard is so vague about this. I mean why else would for_each return a functor if not to allow the functor to accumulate data that can be retrieved after the algorithm finishes? Yet the std does not explicitly state anything about that. It reads,
Notes: If f returns a result, the result is ignored.
What does that mean? Ignored by who or what?