Re: [Boost-users] [BGL] seg fault : more readable

Subject: Re: [Boost-users] [BGL] seg fault : more readable
From: Brian Budge (brian.budge_at_[hidden])
Date: 2009-10-22 19:08:34

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 <jrobertson7711_at_[hidden]>wrote:

> 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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