How can we prevent instantiation a class

You can use the Singleton Pattern & its implementation with C++[^].

The functionality can be achieved by making the constructor private. You will still need a static function to get the heap allocated handle. This is how i usually do it (the same behavior you asked for)

P.S. this is not complete code, just half baked solution to show you the direction.

#include <iostream>

using namespace std;

class A
{
private:
	A()
	{

	}
	
public:

	static A* CreateAndGetInstancePointer()
	{
		return new A();
	}

	int test()
	{
		return 2;
	}

};

int _tmain(int argc, _TCHAR* argv[])
{
	// This will give compile time error
	//A a;
	
	//cout << a.test();

	A *pa = A::CreateAndGetInstancePointer();
	
	cout << pa->test();
	
	return 0;
}

</iostream>