Question

Im holding an iterator that points to an element of a vector, and I would like to compare it to the next element of the vector.

Here is what I have

Class Point{
public:
 float x,y;
}

//Somewhere in my code I do this

vector<Point> points = line.getPoints();

foo (points.begin(),points.end());

where foo is:

void foo (Vector<Point>::iterator begin,Vector<Point>::iterator end)
{
    std::Vector<Point>::iterator current = begin;

    for(;current!=end-1;++current)
    {
        std::Vector<Point>::iterator next = current + 1;

        //Compare between current and next.
    }
}

I thought that this would work, but current + 1 is not giving me the next element of the vector.

I though operator+ was the way to go, but doesnt seem so. Is there a workaround on this?

THanks

Answer 1

current + 1 is valid for random access iterators (which include vector iterators), and it is the iterator after current (i.e., what you think it does). Check (or post!) your comparison code, you’re probably doing something wrong in there.