#include <iostream>

class Abstract
{
public:
  virtual void pureVirt() = 0;
};

void func(Abstract ** b);

int main()
{
    Abstract * array[99];
    
    func(array);
    
    if(array[0]==NULL)
        std::cout << "is NULL\n";
    
    return 0;
}

void func(Abstract ** b)
{
    b[0]=NULL;
}