#include <memory>   // for std::unique_ptr
#include <cstdlib>  // for EXIT_SUCCESS

using std::unique_ptr;

int main(int argc, char **argv) {
  unique_ptr<int> x(new int(5));  // Success: constructor takes raw pointer

  unique_ptr<int> y(x);           // Failure: no copy constructor

  unique_ptr<int> z;              // Success: default constructor initializes
                                  // to nullptr

  z = x;                          // Failure: no assignment operator

  return EXIT_SUCCESS;
}