How does memory get allocated to class member variables?

Question

 please clear me in this basic issue.

when the memory will be allocated to class member variables?
Kindly, note here that I am only concerned about class member variables memory allocation and not class object.
Is it at compile time or runtime?

eg:
class one
{
public:
int i; // Where will it get stored on Stack or Heap?
private:
one();
onemore();
}

int main()
{
one ob1;
retun 0;
}


Thanking you,
VyankateshS.