struct S
{
  S() = default;
  S(S const& rhs) = delete;
  S& operator=(S const& rhs) = delete;
 
  S(int x) : x_(x) {}
  int x_;
};
 
int main()
{
  S s0;
  S s1 = { 1 };
  // S s2 = 2; copy deleted   
  // s0 = s1;  = deleted 
}