Accepts a message that was offered by this multitype_join block, transferring ownership to the caller.
virtual message<_Destination_type> * accept( runtime_object_identity _MsgId, _Inout_ ITarget<_Destination_type> * _PTarget );
The runtime_object_identity of the offered message object.
A pointer to the target block that is calling the accept method.
A pointer to the message that the caller now has ownership of.