variadic constructor?

[JUAN DENT]

Hi,

I have a variadic template factory function that accepts an unknown number of arguments. This is supposed to call a private constructor, but I don't know how to connect the factory to the actor.

Something like this is what I have:

class X : public std::enable_shared_from_this<X> {
int i;
double d;
public:
template<typename...Ts>
static std::shared_ptr<X> create( Ts&&...params) {
/// HERE!! how do I code this???
/// Assume I have to keep this factory's signature
}
private:
// constructor is private:
X(int x, double y) : i{x}, d{y} {}

};

Thanks
Juan

[Cubbi]

seems as easy as

  template<typename...Ts>
  static std::shared_ptr<X> create( Ts&&...params) {
    return std::shared_ptr<X>{new X(params...)};
  }

(or, better, X(std::forward<Ts>(params)...) since you took forwarding refs)

[JUAN DENT]

Great!! Thank you, beautiful!!!

One doubt: what happens if we ommit the forward?

Thanks again,
Juan

[Cubbi]

if you omit the forward, you might be copying where you could have moved.