Joel de Guzman wrote:
Now...
std::for_each(x, f) // x is a variant std::for_each(y, f) // y is a variant
Darned. I meant a vector of variants of course ;-)
in addition to what fusion does (zero overhead), the variant code will also have to emit some switch code to dispatch to the correct 'f' (visitor) overload.
Anyway, having said all that, vector of variants do have their place. Its most important property is the ability to dynamically resize the container. Fusion sequences will always have fixed sizes. So, bottom line, use the right tool for the job. Both have their place and comparing one to the other is like comparing std::vector with boost::array. There's reason for the existence of both. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net