"Arkadiy Vertleyb" <vertleyb@hotmail.com> writes:
"David Abrahams" <dave@boost-consulting.com> wrote
MPL vectors contain optimizations that a naive type vector (and _especially_ a typelist) does not
Just out of curiosity, what's a "naive type vector"?
A type vector you might implement after thinking about it for 5 minutes.
You mean iterators? What makes you think their presence is going to cause compilation to slow down?
Well, iterators are separate templates, and require to be instantiated...
Only if used. The template does need to be parsed, but that's not a big hit. mpl::at<some_mpl_vector, N>::type doesn't use iterators.
Also if you dereference them through meta-function, like mpl::dereference<Iter>::type, that's one more instantiation.
Of course, but only if you use iterators. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com