[Boost-users] boost::parameter -- merging two ArgPacks

hello, here's what i'm looking to do: template<typename ArgPack> result_type unary_fun(const ArgPack& args){ //typically calls args[some_tag] } template result_type binary_fun(const ArgPack1& args1,const ArgPack2& args2){ return unary_fun(merge(args1,args2)); } i'm looking to define merge. not familiar enough with arg_list.hpp any help would be appreciated. thanks.