how to iterate over 2d vector c++ code example

Example: how to iterate over 2d vector c++

#include
#include
using namespace std;
/*
Iterate over vector of vectors and for each of the 
nested vector print its contents
*/
template 
void print_2d_vector(const vector< vector > & matrix)
{
    for(auto row_obj : matrix)
    {
        for (auto elem: row_obj)
        {
            cout<