Question

For example if I had one or more 2D vectors and I just want to store them in a data base for example.

 vector<vector<double>> one2DVector;
 vector<vector<double>> two2DVector;

 //Obviously can't do that but this is what I want to do
 vector<vector> dataBase;

 dataBase.push_back(one2DVector);
 dataBase.push_back(one2DVector);

Answer 1

You need to declare it like this:

vector<vector<vector<double>>> dataBase;

Note that if you using C++98 and not C++11, you need to put spaces between the > brackets.