Re: [Boost-users] BGL problem, originally [Another C++inheritence/polymorphism problem]

On Feb 11, 2005, at 6:00 PM, Welson Sun wrote:

template <typename Vertex> void operator()(std::ostream& out, Vertex& v) { out << "[label=\"" << g[v].toString() << "\"]"; [snip] template <typename Edge> void operator()(std::ostream& out, Edge& v) { out << "[label=\"" << "E" << "\"]"; }

I think it's a problem with the reference... typically, you just accept vertex and edge descriptors by-value (not by-reference), because they're small and cheap to copy. So the second operator() would start with: template<typename Edge> void operator()(std::ostream& out, Edge v) { Doug