http://www.two-sdg.demon.co.uk/curbralan/papers/accu/CloneAlone.pdf なるほどねぇ。 template <typename Derived, typename Base> Cloner : public Base { public: virtual Base* Clone() const { return new Derived(static_cast<Derived&>(*this)); } }; class Rectangle : public Cloner<Rectangle, Graphic> { public:</rectangle,></derived&></typename>…

http://www.two-sdg.demon.co.uk/curbralan/papers/accu/CloneAlone.pdf なるほどねぇ。

http://en.wikipedia.org/wiki/Command_pattern やっぱり、こういうスタイルの方がいいのかなぁ... namespace EditorCommand { class Base { public: virtual void Execute(TextEditor& target) = 0; virtual ~Base() { } }; /** Cut Command */ class Cut :…