Re: [Boost-users] seg fault

typedef string Colour;

struct edge_properties {

vector < set< Colour > & > eColours;

}

No, it won't compile. Template arguments of a vector are required to be default constructible. Reference types (set<color>&) are not default constructible. See: set<color>& x; // Error. Andrew Sutton andrew.n.sutton@gmail.com