Question

I have a class that contains a few multi-dimensional arrays. I am trying to initialize these arrays in the constructor, but I am having trouble figuring our how to do it. The array is always of a fixed size. Here’s what I have so far:

class foo {
  private: 
    int* matrix; //a 10x10 array

  public:
    foo();

  foo:foo() {
    matrix = new int[10][10]; //throws error
  }

the error I get is:

cannot convert `int (*)[10]' to `int*' in assignment 

how can I accomplish this? preferably, I would like the array to default to a 10×10 array of all 0s.

Answer 1

#include <memory.h>
class foo
{
    public:
        foo()
        {
            memset(&matrix, 100*sizeof(int), 0);
        }
    private:
        int matrix[10][10];
};

That is, if you’re not binding yourself to doing it with pointers (otherwise you can just pass in the pointer to memset, rather than a reference to the array).