Const reference field as readonly property in C++ class

Question

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';

Answer 1

do this code meet good practices?

Not really, since it introduces unnecessary complexity and space overhead.

Moreover, you wouldn't be able to perform runtime checks and/or assertions, regardless of the value being accessed.

Furthermore, what happens with the lifetime and semantics?

Try assigning one check in your code to another and see what happens. The assignment is ill-formed because the class is non-assignable. You should provide a copy and move constructor to take care of the reference, so that it won't refer to the old object's data member.

Better use _x directly and have a straightforward inline getter function.

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PS: C#-like properties in native C++?