Hi Andrew, Thanks very much for the help, I've got it working now. I had to use a non-const reference though. Here are the options I tried: // Option A: Graph &nonConstGraph = const_cast<Graph&>(graph); typedef boost::property_map<Graph, double EdgeProp::*>::type EdgeWeightMap; EdgeWeightMap edgeWeightMap = get(&EdgeProp::cost, nonConstGraph); // Option B: // typedef boost::property_map<Graph, double const EdgeProp::*>::type EdgeWeightMap; // EdgeWeightMap edgeWeightMap = get(&EdgeProp::cost, graph); Option A works, but is a bit ugly. Option B is what you suggested, but it gives the following error: /home/a.brooks/shh/src/libs/prm/test/stupid.cpp:70: error: conversion from 'boost::bundle_property_map<const boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, Point*, EdgeProp, boost::no_property, boost::listS>, boost::detail::edge_desc_impl<boost::undirected_tag, unsigned int>, EdgeProp, const double>' to non-scalar type 'searchThroughGraph(const Graph&, VertexRef, VertexRef, std::vector<unsigned int, std::allocator<unsigned int> >&)::EdgeWeightMap' requested Do I also need to modify the 'get()' line?
It's pointer-to-member syntax. Read from right to left You're saying that the type is a "pointer to a member of EdgeProp that is of type double." Or in this case, a pointer to a const EdgeProp that's a double.
Awesome, thanks for the pointer. Cheers, Alex