Question

Thanks for all the help, I have moved my initializations down to the Constructor, however, I’m having difficulties defining the 2D vector:

Here is what I have done:

private:
        vector < vector <int> > Matrix;
        vector < vector <int> > temp_m;
        vector <int> elements
        string input;
        int value;
function()
{
//Initialize Both Matrices (one which holds the puzzle and the
//other which holds the values between 1 and 9
//Create a vector of vectors:
for(int i = 0; i < 9; i++)
    elements.push_back(i+1);
for(int i = 0; i < 9; i++)
    Matrix[i].push_back(elements);  //ERROR HERE
}

I’m getting an error in the line where I define the 2D matrix. I want to push back matrix into its indices since its a matrix of a matrix.

Answer 1

The declaration of “row” and its construction are not in the same place. Construction belongs on an initializer list:

class MyClass
{
public:
    MyClass::MyClass()
      : row(9,0), elements(9)
    {
    }

private:
        vector < vector <int> > Matrix;
        vector < vector <int> > temp_m;
        vector <int> row;
        vector <int> elements;
        string input;
        int value;
}

If you have any other special sizing or initialization of member variables the require construction parameters (such as your Matrix and temp_e above) they belong in the initializer list as well.