At least before C++0X, a vector of references is not allowed. I'm not sure
about after C++0X (haven't dabbled much there yet).
Brian
On Thu, Oct 22, 2009 at 3:41 PM, John Robertson
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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