Re: [boost] Re: [optional]output

David Abrahams wrote:

If you want to be unambiguous, it has to be more like:

[hello] <- a non-empty optional<std::string> [] <- a non-empty optional<std::string> (the string is empty) _ <- an empty optional<T>

My preference is hello _ A string can never be output "correctly", no matter what the delimiters are ("a] [b"). I'd concentrate on making optional<X> (reasonably) bi-directional when X is bi-directional.