Question

this may be a very basic c++ question but I am a bit rusty. I am trying to set up a maze type data structure with points. Here is my code.

class Point{

    public :

    int xCoord;
    int yCoord;
    bool visited;

    //constructors
    Point(){}
    Point(int x, int y){
        xCoord = x;
        yCoord = y;
        visited = false;
    }
    int makeVisited(){
        visited = true;
    }

    int makeUnvisited(){
        visited = false;
    }
};



class Maze{

    public :

    int width;
    int height;
    Point ** grid; 

    //constructors
    Maze(){}
    Maze(int X, int Y){
        width = X;
        height = Y;
        grid = new Point*[width];
        for(int i = 0; i < width; i++){
            grid[i] = new Point[height];
            for(int j = 0; j < height; j++){
                grid[i][j] = new Point(i, j);
            }
        }
    }
}; //end of Maze class

When I try to asign grid[i][j] a new point instance, I get an error saying

“error no operator “=” matches these operands”

Can someone tell me what I did wrong with the initialization of the point object?

Answer 1

Since grid is declared as a Point**, then grid[i][j] is of type Point. So you can’t assign a new Point to this.

---

One thing you can do is to define a setter member function, like:

void Point::set(int x, int y) {
  xCoord = x;
  yCoord = y;
}

And then in your loop you can use:

grid[i][j].set(i, j);