AMDG Skelly, Luke wrote:
Please ignore my last message. I somehow accidentally sent it while still editing!
I am trying to create a std::map from an mpl::map. I've been trying to figure out how to use mpl::for_each to accomplish this. The problem I have is that the runtime function is passed to for_each by value and returns void. All the examples I've seen for mpl::for_each involve printing and not creating any new objects. Here is the attempt I've made:
<snip>
The problem is in the call to mpl::for_each in the MapMaker constructor. The std::map is created, but never returned. I've considered making func_map static, but that complicates things quite a bit, especially since MapMaker it is a class template.
Have MapMaker store a reference to map. (Warning untested code) typedef std::map<std::size_t, std::size_t> map_type; struct MapMaker { map_type& m; template<class T> void operator()(T) const { func_map[U::first::value]=U::second::value; } }; template<class MplMap> map_type makeMap() { map_type result; MapMaker f = { result }; boost::mpl::for_each<MplMap>(f); return result; } In Christ, Steven Watanabe