#include <iostream>
using namespace std;

struct X {
const int x;
X(const int& x): x(x) {}
X(const X&) = delete;
X& operator=(const X&) = delete;
X(X&& rhs): x(move(rhs.x)) {
cout << "called X(X&&)" << endl;
}
X& operator=(X&& rhs) {
cout << "called operator=(X&&)" << endl;
return *this = X(move(rhs));
}
};

int main()
{
X a = X(2);
cout << a.x << endl;
}

・・・誰が呼ばれたの？・・・