Messenger( Messenger&& soi ); // move construction
Messenger& operator=( Messenger&& soi ); // move operator
~Messenger(); // destroyer
void Add_msg_cb( int mtype, user_callback fun_name, void* data );
Messenger( Messenger&& soi ); // move construction
Messenger& operator=( Messenger&& soi ); // move operator
~Messenger(); // destroyer
void Add_msg_cb( int mtype, user_callback fun_name, void* data );