Hi, thanks for both answers! Jeffreys suggestion is just perfect and so extremely nice, that i just have to link it :) http://www.boost.org/doc/libs/1_52_0/doc/html/proto/appendices.html#boost_pr... awesome stuff! Also thanks Mathias. Your trick using F::result< F(Block<T>) >::type instead of boost::result_of is a nice way to solve the problem pre C++11, however it would not generalize to C++11 compilers where I would not be able to require the existence of the struct. As I want to support both, this is unfortunately ruled out. But many thanks! Greetings, Oswin First of all, I can't use C++11, so i am bit a in a disadvantage. On 08.02.2013 18:26, Mathias Gaunard wrote:
Both can be done using SFINAE, the latter will require a recent enough compiler that supports generalized SFINAE (GCC does it since 4.6 I believe). _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users