Creating 2D-Array inside a constuctor in C++ - c++

Question

I am trying to do the following:
class Test{
private:
int x;
int y;
// Create array[][] here
public:
Test(const int x, const int y){
this->x = x;
this->y = y;
// set: array[x][y] here
}
};
As you see I would like to create a 2d-Array, while the bounds will be given in the constructor.
How can I achieve this?
It works with an usual array:
class Test{
private:
int x;
int y;
int *array;
public:
Test(const int x, const int y){
this->array = new int[x]; // works
// this->array = new int[x][y] does not work
this->x = x;
this->y = y;
}
};

Answer 1

You may be bumping into the problem of "All dimensions must be constants except the leftmost" discussed here.
Instead, try the following:
class Test {
private:
int x;
int y;
int** myArray;
public:
Test(const int x, const int y) : x(x), y(y) {
myArray = new int*[x];
for (int firstDimension = 0; firstDimension < x; firstDimension++) {
myArray[firstDimension] = new int[y];
for (int secondDimension = 0; secondDimension < y; secondDimension++) {
myArray[firstDimension][secondDimension] = secondDimension;
}
}
}
~Test() {
for(int i = 0; i < x; i++)
delete[] myArray[i];
delete[] myArray;
}
};

Answer 2

you should consider allocating memory with pointers, should be as follows:
class Test{
private:
int x;
int y;
int **array;
public:
Test(const int x, const int y){
int i;
this->array = new int*[x]; // first level pointer asignation
for(i=0;i<x;i++){
this->array[x] = new int[y]; // second level pointer asignation
}
// this->array = new int[x][y] does not work
this->x = x;
this->y = y;
}
};
see this.