Const reference field as readonly property in C++ class

Is it good to use a const reference field as a readonly getter in C++ classes?

I mean, does this code meet good practices?

class check{
private:
    int _x;
public:
    const int& x = _x;
    void setX(int v){
        _x = v;
    }
};

It is working very much like C# properties, IMHO, and very easy and clean in class usage code:

  check s;
  int i;
  std::cin >> i;
  s.setX(i);
  std::cout << s.x << '\n';
  s.setX(7);
  // s.x = i; // Error
  std::cout<<s.x<<'\n';