[Boost-users] [MPL] How to use a mpl::map

Subject: [Boost-users] [MPL] How to use a mpl::map
From: Daniele Barzotti (daniele.barzotti_at_[hidden])
Date: 2013-03-15 03:52:49

Hi,

I'm new to MPL and I have difficulties to use the map container.
I need to map (and then retrieve) some types based on they ID:
I try the following code but it does not work..

sturct MSG_METHOD_CONNECT {
 ....
}

template<class MESSAGE>
class PBMessage
{
public:
  PBMessage() {};
  /* ... other methods ... */
private:
  MESSAGE m_Msg;
};

// 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;

// The Message type
template < typename MessageMap, int opCode >
typedef typename mpl::at<MessageMap, mpl::int_<opCode> >::type::value
TMessage;

And to retrieve the type:
TMessage<TMessageMap, opCode> msg;

Could someone give me some suggestions?
Regards,
Daniele.