example inherit/crtp forwarding ctr for derived from base

crtp.cc

#include <iostream>
#include <string>
using namespace std;

template <typename Child>
struct Routing {
  Routing() = delete;

  explicit Routing(std::string s) : t(s) {}
  void Get() { static_cast<Child*>(this)->FacadeGet(); }
  void Hello() { std::cerr << t; }
  string t;
};

template <typename Child>
struct MaidMgr {
  void interface() {
    static_cast<Child*>(this)->FacadeGet();
    CallHello();
  }
  void CallHello() { static_cast<Child*>(this)->Hello(); }
  void Get() {
    std::cerr << "MaidMgr Get\n";
    static_cast<Child*>(this)->Hello();
  }
};

template <typename Child>
struct DataMgr {
  void interface() {
    static_cast<Child*>(this)->FacadeGet();
    CallHello();
  }
  void CallHello() { static_cast<Child*>(this)->Hello(); }
};

struct Facade : public MaidMgr<Facade>, public DataMgr<Facade>, public Routing<Facade> {
  Facade() = delete;
  Facade(std::string s) : Routing(s) {}  // forwarding ctr - unsure msvc will allow this
  void FacadeGet() { cerr << "Derived implementation " << x << "\n"; }
  string x = "test";
};

int main() {
  Facade d(std::string("hello"));

  d.template MaidMgr<Facade>::Get();
}