The following compiles and runs.
typedef string Colour;
struct edge_properties
{
vector < set< Colour
> > eColours;
}
//get a reference to the vector of the sets of colours of some edge.
vector < set<Colour> > & v_colour_outset = get(m_eColours_map,*out_iter); // Here *out_iter is some edge.
//Add a set<Colour> to v_colour_outset ie. to get(m_eColours_map,*out_iter) .
set<Colour> colour_set;
v_colour_outset.push_back(colour_set);
// get a reference to one of the set<colour> in get(m_eColours_map,*out_iter) .
set<Colour> & outcset = v_colour_outset[1]; //or [0], or any elt.
But when I try to add a new colour to this set
outcset.insert("Blue");
I get segfault.
My
guess is that there is a predetermined size for colour_set, and when it
is push_backed into v_colour_outset, a new colour cannot be added into
it.
I tried to create a vector of set<Colour> references as follows.
struct edge_properties
{
vector < set< Colour
> & > eColours;
}
But it did not compile. ( shouldn't it? )
Whats the best solution to this problem.
Thanks
- JR