List of vectors [closed]

Question

I am trying to figure out how to properly use a list of vectors.

I understand how to declare

list< vector<int> > variableName;

but I do not know how to actually set anything to it or pull any information out of it.

More specifically, I am trying to make a list of vectors of objects and I would like to be able to set and pull information from this.

list< vector<ClassObject> > listOfVectorsOfClass;

Can anyone help me out?

Answer 1

You can access information with iterators:

 list< vector<ClassObject> >::iterator list_it;
 vector<ClassObject>::iterator vec_it;
 for (list_it = listOfVectorOfClass.begin(); list_it != listOfVectorOfClass.end(); 
         ++ list_it)
 {

     for (vec_it = list_it->begin(); vec_it != list_it->end(); ++ vec_it)
     {
          //do something with vec_it
          //for example call member function of Class
          (*vec_it).print();
     }
}//can use const_iterator depends on what you will do on class objects

It is the same thing as you access list of vectors of int.

Answer 2

Do you want a sample ?!

list< vector<int> > variableName;

variableName.push_back({1, 2, 3});
variableName.push_back({4, 2, 6});

for (auto &v : variableName)
{
    for (auto &x : v)
        cout << x << " ";
    cout << endl;
}