Hi!
For the project I'm working on I need to calculate distances on a graph
from a couple of vertices to all other vertices. The
topology.shortest_distance can only do either from all vertices or from a
single one, and to save time I'd like this to run in parallel, so I set out
to implement this in C++. I took inspiration from graphtool's
implementation of shortest_distance for pairwise distances in unweighted
graphs (running BFS from all vertices in parallel), and managed to modify
that to only run from some vertices. However I ran into a problem trying to
do the same for weighted graphs. I think the problem I have is that when
passing the vector for distances to all vertices it is supposed to be a
property map and not a vector, but I cannot figure out how to get a 1d
property map from a 2d property map on a C++ level, basically I pass a
vector<double> property map to my function but I need to pass a simple
double property map to the dijskstra function from boost. Could anyone
please help me point to how would I do that? Or is my approach wrong
completely? What most confuses me that the same approach works fine for
breadth_first_search.
The errors I'm getting in compilation:
/usr/include/boost/graph/dijkstra_shortest_paths_no_color_map.hpp:43:63:
error: no type named ‘value_type’ in ‘struct
boost::property_traits<std::vector<double> >’
43  typedef typename property_traits<DistanceMap>::value_type
Distance;
/usr/include/boost/pending/indirect_cmp.hpp:32:78: error: no type named
‘value_type’ in ‘struct boost::property_traits<std::vector<double> >’
32  typedef typename
boost::property_traits<ReadablePropertyMap>::value_type T;

^
/usr/include/boost/pending/indirect_cmp.hpp:33:76: error: no type named
‘key_type’ in ‘struct boost::property_traits<std::vector<double> >’
33  typedef typename
boost::property_traits<ReadablePropertyMap>::key_type K;
Thank you,
Mikuláš