In 2018 with C++11 and higher, are helper init() functions considered bad form?

Pre C++11 you had no non-static member initializion nor did you have construction delegation, so people often used private helper functions to help with initializtion to reduce code replication.

Is this good code in 2018?

class A  {
  int a1 = 0;
  double a2 = 0.0;
  string a3 = "";
  unique_ptr<DatabaseHandle> upDBHandle;

  init(){
      upDBHandle = open_database(a1, a2, a3);
  }

public:
    A() { init(); }
    explicit A(int i):a1(i) {  init(); }
    explicit A(double d):a2(d) {  init(); }
    explicit A(std::string s):a3(std::move(s)) {  init(); } 
    A(int i, double d, std::string s) : a1(i), a2(d), a3(std::move(s)) { init(); }
};

How can this code be improved?