CPP

c++ class constructor variable arguments

struct A {
     template<typename ... Args>
     A(const char * fmt, Args&& ... args) {
          printf(fmt,std::forward<Args>(args) ...);
     };
};

struct B: public A {
  template<typename ... Args>
  B(const char * fmt, Args&& ... args) : A(fmt, std::forward<Args>(args) ...) {}
};

c++ define constructor with parameters

class House {
private:
  std::string location;
  int rooms;
 
public:
  // Default constructor
  House() {
    location = "New York";
    rooms = 5;
  }
 
  // Constructor with parameters
  House(std::string loc, int num) {
    location = loc;
    rooms = num;
  }
 
  void summary() {
    std::cout << location << " house with " << rooms << " rooms.
";
  }
};