In our last exciting episode Thomas Witt wrote: > User-Agent: KMail/1.5
> On Wednesday 09 July 2003 21:09, Jaakko Jarvi wrote: > > Where we've used enable_if, it has been very common that the condition > > is not just a single traits lookup, but rather a logical expression, > > e.g.: > > > > template <class T, class U> > > typename enable_if<is_matrix<T>::value && is_vector<U>::value,...>::type > > operator*(const T& t, const U& u); > Ok I can see the problem, but what about > template <class T, class U> > typename enable_if< mpl::and<is_matrix<T>, is_vector<U> >,...>::type > operator*(const T& t, const U& u); Would work. Requires some knowledge of mpl and a tiny file to be included, though. Our view is still that at least the enable_if<bool, T> version is needed. The mpl-aware enable_if would be good to have too. Jaakko & Jeremiah _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
