Re: [Boost-users] [graph] How to find out at compile time if a graph has some concrete internal property?

What about runtime detection? Would get(property_tag,graph) compile correctly for an unexistant property? What would it return, then, at runtime if the property does not exist? a 0 pointer?

Unfortunately, I don't think such a function actually exists. However, if you can detect these at compile time, you can easily reflect that as a runtime query: template <typename Graph, typename Prop> bool has_property(Graph const& g) { return has_property_metafunc<Prop, Graph>::value; } Andrew Sutton andrew.n.sutton@gmail.com