- Example

#include <iostream>
#include <string>
class Base{
 public:
    Base() = default;
    Base(int i){
      std::cout << "Base::Base("<< i << ")" << std::endl;
    }
    Base(std::string s){
      std::cout << "Base::Base("<< s << ")" << std::endl;
    }
};
class Derived: public Base{
  public:
    using Base::Base;
    Derived(double d){
      std::cout << "Derived::Derived("<< d << ")" << std::endl;
    }
};
int main(){
  // inheriting Base
  Derived(2011);         // Base::Base(2011)
  // inheriting Base     // Base::Base(C++0x)
  Derived("C++0x");
  // using Derived
  Derived(0.33);         // Derived::Derived(0.33)
}