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#include <iostream>
using namespace std;
 
class Base 
{
public:
    Base() {}
    virtual ~Base() {}
 
    virtual void interfaceFunction1() = 0;
private:
    Base(const Base&);            // all derived classes should be uncopyable
    Base& operator=(const Base&);
 
    // no data members
};
 
struct Derived : Base
{
  	virtual void interfaceFunction1() {}
};
 
 
int main() {
	// your code goes here
	Derived d0, d1;
	//Derived d2(d0); // error: use of deleted function 'Derived::Derived(const Derived&)'
	d1 = d0; // error: use of deleted function 'Derived& Derived::operator=(const Derived&)'
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:28:5: error: use of deleted function 'Derived& Derived::operator=(const Derived&)'
  d1 = d0;
     ^
prog.cpp:18:8: note: 'Derived& Derived::operator=(const Derived&)' is implicitly deleted because the default definition would be ill-formed:
 struct Derived : Base
        ^
prog.cpp:13:11: error: 'Base& Base::operator=(const Base&)' is private
     Base& operator=(const Base&);
           ^
prog.cpp:18:8: error: within this context
 struct Derived : Base
        ^

Standard output is empty