Классы, указатель на динамический массив

class Triangle
{
    Point*mA;
    Point*mB;
    Point*mC;
}
class TriangleCollection
{
    int _cnt;
    Triangle* _triangles;
public:
TriangleCollection(int n);
}
 
Реализация метода:
 
TriangleCollection::TriangleCollection(int n_
{
_cnt=n;
_triangles=new Triangle[n];
    
for(int i=0; i<n; i++)
    _triangles[i]=new Triangle(rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1);
}

std::vector<Triangle> v;

std::list<Triangle> l;

Triangle(const Triangle & obj)

const Triangle & operator=(const Triangle& obj)

Triangle ** _arr
 
arr = new Triangle*[n];
//
arr[i] = new Triangle(rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1);
//и т.д

Triangle * _arr
arr = new Triangle[n];
//
arr[i] = Triangle(rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1, rand()%20+1);