[Boost-users] Is this possible with boost::multi_index?

Below is a small piece of code that I can't get to compile. gcc says: error: forward declaration of 'class search_node' Is there a way to get around this, or can I not embed a multi_index_container like that? I'm using boost 1_32_0 and gcc version 4.0.1 The code below is for a node within a search tree. Each node stores a

class search_node{ int objective_value; // Objective function position my_position; // Move location for this step in the search std::list<position> positions_to_visit; // Future moves to consider in search boost::multi_index_container < search_node, indexed_by< ordered_unique , ordered_non_unique > > search_results; };

... or am I just going down a wrong path? I'm trying to build a search tree. I know boost::graph exists, but don't know if it'd be more appropriate.