Re: [Boost-users] Retrieving edge weights

On Sat, 11 Jun 2011, David Doria wrote:

I found one way to get edge weights:

typedef boost::property_map::type EdgeWeightMap; EdgeWeightMap edgeWeightMap = get(boost::edge_weight, g);

std::pair edgePair = boost::edge(v0, v1, g); Graph::edge_descriptor edge = edgePair.first;

That seems like a lot of work though. It looks like there is a operator[](edge_descriptor), but I don't understand how to use it:

I tried:

g[edge]->edge_weight

That syntax only works for bundled properties. If you had used a struct with an edge_weight member as your vertex property type, you could use the [] syntax. With the old-style property syntax, however, you will need to use the version you posted at the top. You can use a three-parameter version of get (get(boost::edge_weight, g, v) is the order, I think) if you are not getting a lot of weights. -- Jeremiah Willcock