#include <iostream>
#include <string>
using namespace std;
 
struct base
{
	string &s;
	base(string &s1) : s(s1) {}
	//base(base&&) = default;
};
 
struct base2
{
	string &s;
	base2(string &s1) : s(s1) {}
	//base2(base2&&) = default;
};
 
struct derived
    :base
    ,base2
{
    derived(string &arg)
        :base(arg)
        ,base2(arg)
    {}
 
    //derived(derived&&) = default;
    //derived(const derived&) = delete;
};
 
int main() {
	string s;
	derived d1(s);
	derived d2(std::move(d1));
	return 0;
}
 
 

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