Filling up a 2d vector containing scruct

Question

I have a small struct containing a bool, char & two ints. But when I try to run this code, I get into a problem.

struct Struct
{
  bool check;
  char display;
  int x,y;
};

typedef vector<Struct> Array;

vector<Array> Matrix;

for (int i = 0; i < rows; i++)
{
    vector<Struct> temp;

    for (int j = 0; j < cols; j++)
    {
        temp[i].push_back(Matrix);
    }

    Matrix.push_back(temp);
}

I want to fill my 2D array so that I would later be able to write something in terms of:

for (int i = 0; i < rows; i++)
{
    for (int j = 0; j < cols; j++)
    {

            Matrix[i][j].display = '*';

    }

}

However, as of now, I get the error: "temp has no member push_back()".

Answer 1

You are referring temp[i]. As temp is not an array or a vector of vectors it can't be used like that. When you do temp[i] you are getting the i'th element of vector temp, which is a Struct, which has not a push_back method.

You can do something like this to initialize the Matrix:

....
for (int i = 0; i < rows; i++)
{
    vector<Struct> temp;

    for (int j = 0; j < cols; j++)
    {
        Struct s;
        s.check = true;
        s.display = 'c';
        s.x = i;
        s.y = j;  
        temp.push_back(s);
    }

    Matrix.push_back(temp);
}
....