[BGL] seg fault : more readable

22 Oct 2009

      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

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John Robertson

Brian Budge

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