Hi,
I have the following concept:
template < class GRAPH, class EDGE_PREDICATE, class VERTEX_PREDICATE >
class FilteredGraph
{
public:
/// Defines an alias type to represent the filtered_graph
typedef filtered_graph< GRAPH, EDGE_PREDICATE, VERTEX_PREDICATE >
FilteredGraphContainer;
//
// some c'tors, member functions etc.
//
template< class VERTEXPROPERTIES >
VERTEXPROPERTIES& properties(const Vertex& v) const
{
typename property_map::const_type param = get(vertex_properties, graph_);
return (param[v]);
}
//
// some more stuff
//
};
When I want to use this code to access the properties of a vertex of the
FilteredGraph, the compiler says that it can't find this function.
I searched around and found some notes about returning a template. The most
prevalent is that the compiler simply does not know which type the function
should return and thus can't find a valid signature and complains.
Is there a way to let it find the type via the property_map? Or some other
ideas how to solve this issue?
I experimented with:
template< class VERTEXPROPERTIES >
VERTEXPROPERTIES& properties(const Vertex& v) const
{
typename property_map::const_type param = get(vertex_properties, graph_);
property_traits< typename property_map::const_type > prop_trait;
return prop_trait.reference(param[v]);
}
but with no success.
Except for this, I have no reason to include a template for VERTEXPROPERTIES
generally to the class. So I would really like to keep that concept as it is.
Thank you.
Best,
Cedric
