Am 15.03.2013 08:52, schrieb Daniele Barzotti:
// Map of types. The key is the Message opCode typedef typename mpl::map< mpl::pair<mpl::int_[100], PBMessage<MSG_METHOD_CONNECT> >, mpl::pair<mpl::int_[101], PBMessage<MSG_EVENT_CONNECT> >, > TMessageMap;
typedef mpl::map< mpl::pair<mpl::int_<100>, PBMessage<MSG_METHOD_CONNECT> >, mpl::pair<mpl::int_<101>, PBMessage<MSG_EVENT_CONNECT> > > TMessageMap;
// The Message type template < typename MessageMap, int opCode > typedef typename mpl::at<MessageMap, mpl::int_<opCode> >::type::value TMessage;
there are no templated typedefs, just use mpl::at<TMessageMap,mpl::int_<100> >::type to look up the type for an "opcode". However, IIUC what you're trying to do, you won't know the op code at compile time, as you're reading it at runtime from some kind of message stream. Maybe the following code is helpful to you. it does something very similar (read log entries of different types from a file). http://pastebin.com/Q2XGz2R2 it uses a MPL vector instead of a map though and assigns the Ids ("op codes") continuously, so the first entry has id 1, the second Id 2, ...