fork download

copy

#include <iostream>
using namespace std;
 
class baseclass {
	protected:
	int field; 
 
	public:
	baseclass(baseclass const&) = delete;
	baseclass& operator=(baseclass const&) = delete;
 
	baseclass() : field(0) {}
	baseclass(int a) : field(a) {}
};
 
class derived1 : private baseclass {};
 
class derived2 : private baseclass {
	public:
	derived2() = default;
	derived2(derived2 const & other) {
		baseclass(other.field);
	}
	derived2& operator=(derived2 const& other) {
		field = other.field;
		return *this;
	}
};
 
 
int main() {
	// your code goes here
 
	derived1 d1;
	auto d1c = d1;
 
	derived2 d2;
	auto d2c = d2;
 
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:35:13: error: use of deleted function 'derived1::derived1(const derived1&)'
  auto d1c = d1;
             ^
prog.cpp:16:7: note: 'derived1::derived1(const derived1&)' is implicitly deleted because the default definition would be ill-formed:
 class derived1 : private baseclass {};
       ^
prog.cpp:16:7: error: use of deleted function 'baseclass::baseclass(const baseclass&)'
prog.cpp:9:2: note: declared here
  baseclass(baseclass const&) = delete;
  ^

Standard output is empty