Initializing a two dimensional std vector

Question

So, I have the following:

std::vector< std::vector <int> > fog;

and I am initializing it very naively like:

  for(int i=0; i<A_NUMBER; i++)
    {
            std::vector <int> fogRow;
            for(int j=0; j<OTHER_NUMBER; j++)
            {
                 fogRow.push_back( 0 );
            }
            fog.push_back(fogRow);
    }

And it feels very wrong... Is there another way of initializing a vector like this?

Answer 1

Assume you wish to start a 2D vector, m*n, with a value of 0.

We could do it.

#include<iostream>
int main(){ 
    int m = 2, n = 5;

    vector<vector<int>> vec(m, vector<int> (n, 0));

    return 0;
}