Question

In the code below I would like array to be defined as an array of size x when the Class constructor is called. How can I do that?

class Class { public:   int array[];   Class(int x) : ??? { } } 

Answer 1

You can’t initialize the size of an array with a non-const dimension that can’t be calculated at compile time (at least not in current C++ standard, AFAIK).

I recommend using std::vector<int> instead of array. It provides array like syntax for most of the operations.