Question

So here’s an example. The star’s mLocation and mSpeed are a Vector3 custom type.

I’v tried:

Star &star = *iStar;
Star star = *iStar;

Using iStar-> directly doesn’t work with my operators, not sure why.
So whats the proper way to do that?

   void UniverseManager::ApplySpeedVector()
   { 
   std::list <Star>::const_iterator iStar;

       for (iStar = mStars.begin(); iStar != mStars.end(); ++iStar)
       {
           // how to I get a hold on the object the iterator is pointing to so I can modify its values
                   // i tried  Star &star = *iStar;  this is illegal
                   // tried just using the iStar->mLocation += iStar->mSpeed this also fails due to the operator not accepting the values not sure why
                   // tried other things as well, so what is the proper way to do this?

           iStar->SetLocationData( iStar->mLocation += iStar->mSpeed);
       }
   }

Answer 1

std::list<Star>::const_iterator iStar;

You cannot modify the objects in a container via a const_iterator. If you want to modify the objects, you need to use an iterator (i.e., std::list<Star>::iterator).