I am getting a lot of errors trying to use an iterator for three dimensional vector of sets of ints. See the following code (which is just select pieces, because the whole thing is too long; I think this should be enough to see what is wrong, but let me know if it isn't):

```
vector<vector<vector<set<int> > > > particles_celllist;
vector<vector<vector<set<int> > > >::iterator cell_iter;
map<int,map<int,Particle> > particle_grid;

for (cell_iter=particles_celllist[wx][wy][wz].begin();cell_iter!=particles_celllist[wx][wy][wz].end();cell_iter++)
{
    double distance_to_cell=sqrt(pow(particles[*cell_iter].position().y()-(wy)*ygridlength,2)+
        pow(particles[*cell_iter].position().z()-(wz)*zgridlength,2));
    if (distance_to_cell<input_data.diam_large())
    {
        particle_grid[box_counter][*cell_iter]=particles[*cell_iter];
    }
}

```

Note: wx, wy, wz, and box\_counter are ints, ygridlength and zgridlength are doubles, and Particle::position::y (or ::z) and input\_data::diam\_large return doubles.

I get a multitude of errors:

> 
> no match for operator "=" in
>  "cell\_iter=particles\_celllist[wx][wy][wz].begin()"
> 
> 
> no match for operator "!=" in
>  "cell\_iter!=particles\_celllist[wx][wy][wz].end()"
> 
> 
> no match for operator "[]" whenever I used [\*cell\_iter] to call
>  something
> 
> 
> 

I get the feeling like the error somehow stems from the iterator itself, but I haven't been able to figure it out.