[assign] Some basic questions (lengthy code example)

Hi all, I could use some advice regarding this lengthy code example: ---------- <code> ------------ #include <vector> #include <map> #include <boost/function.hpp> #include <boost/assign.hpp> struct E1 {}; struct E2 {}; enum State { eS1 = 1, eS2 }; typedef boost::function< bool (const E1 &, int) > function0_t; typedef boost::function< bool (const E2 &, int) > function1_t; struct Functions { // Functions(std::vector< function0_t > af0 , std::vector< function1_t > af1) // : f0(af0) , f1(af1) // { // } std::vector< function0_t > f0; std::vector< function1_t > f1; }; struct Handler1 { bool operator()(const E1&, int) {return true;} }; struct Handler1a { bool operator()(const E1&, int) {return true;} }; struct Handler2 { bool operator()(const E2&, int) {return true;} }; typedef std::map< State, Functions > InitDesc; using namespace boost::assign; int main() { // [1] this works just fine Functions f1 = { list_of(Handler1()), list_of(Handler2())}; // [2] this doesn't work cause Handler1 and Handler1a have different types Functions f2 = { list_of(Handler1())(Handler1a()), list_of(Handler2())}; // [3] don't know how to do this InitDesc desc = map_list_of(eS1, {list_of(Handler1()), list_of(Handler2())}) (eS2, {list_of(Handler1a()), list_of(Handler2())}); } ---------- </code> ------------ The places marked with [1], [2] and [3] are of special interest for me. I like [1] very much thanks to what bost::assign offers me. Unfortunately I can get [2] only to work, if I explicitly create instances of function0_t from Handler1 and Handler1a. Are there more elegant ways to make this work? [3] is obviously broken, but I don't know how to come up with a similarly compact way to initialise an InitDesc instance. I can uncomment Funtions' constructor above and call it explicitely with what I've written into curly braces but that unfortunately breaks [1] (because Functions is no longer aggregate then). Is there a better way to do it prefarably without breaking [1]? TIA, aa -- Andreas Ames | Programmer | Comergo GmbH | Voice: +49 69 7505 3213 | andreas . ames AT comergo . com