Hi! Started out with tuple but soon moved to fusion as it suits my needs much better, so thanks for fusion! My problem is the following: list seq2(1,2,3); list seq1; struct fa { typedef unsigned int result_type; template result_type operator()(const S1& s1, const S2& s2) const { return s1(s2); // this calls W<A>(A), W<B>(B), W<C>(C) } }; struct fb { typedef std::vector<unsigned int> result_type; template <typename T> result_type operator()(const result_type& a, const T& t) const { result_type a2(a); a2.push_back(t); return a2; } }; accumulate( transform(seq1,seq2,fa()),fb() ); /* The above yields an error: no matching function for call to ‘accumulate(boost::fusion::transform_view, const boost::fusion::list, database::histogram::fb>) */ How can I use a transform_view (the result of transform(S1,S2,F)) as input for accumulate? Thank you, Thomas