Hello alltogether, I've posted this already in Stackoverflow a week ago with no answer up to now, so I thougth I try it here again. I want to set a value in a fusion::vector at a specific location. This works normaly very well with fusion::at_c(seq) = value, as at_c returns a reference to the object at this position. However, this is not garanted, the documentation only states about the return type: "In most cases, this is a reference". I've encounterd a case where it is not a reference, when the objects are of type boost::shared_ptr<anytype>. Therefore I cant set the values as I'm only overriding a temporary. Minimal example: struct Object1{}; struct Object2{}; typedef fusion::vector<boost::shared_ptr<Object1>, boost::shared_ptr<Object2>

seq_type;

seq_type seq; boost::shared_ptr<Object1> value(new Object1()); fusion::at_c<0>(seq) = value; assert(fusion::at_c<0>(seq) ); //assert will be executed because the default constructed empty pointer was not overridden with a valid one BOOST_MPL_ASSERT(( boost::is_reference< result_of::at_c<seq_type, 0>::type > )) //compilation fails because the returned type is not a reference What is a valid alternative of setting the pointers in an fusion sequence? Any help would be appreciated! Thanks, Stefan