[C++ Korea] Effective Modern C++ Study item 22,28 Item 22 : When using Pimple Idiom, define special member functions in the implementation file. +제한재 Item 28 : Understand reference collapsing. +이동우

1. Effective Modern C++ Study
C++ Korea

3. Effective Modern C++ Study
C++ Korea3
widget.h
string vector gadget.h

4. Effective Modern C++ Study
C++ Korea4
widget.cpp
string vector gadget.h widget.h

5. Effective Modern C++ Study
C++ Korea5
조금 더 나은 모양

7. Effective Modern C++ Study
C++ Korea7

8. Effective Modern C++ Study
C++ Korea8
header에서는 정의만 할 수 있도록 할 것.
???

9. Effective Modern C++ Study
C++ Korea9

10. Effective Modern C++ Study
C++ Korea10

12. Effective Modern C++ Study
C++ Korea
template<typename T>
void func(T&& param);
 T가 아닌 param의 type

13. Effective Modern C++ Study
C++ Korea
template<typename T>
void func(T&& param);
Widget widgetFactory(); // function returning rvalue
Widget w; // a variable (an lvalue)
func(w); // call func with lvalue; T deduced
// to be Widget&
func(widgetFactory()); // call func with rvalue; T deduced
// to be Widget

14. Effective Modern C++ Study
C++ Korea
int x;
auto& & rx = x; // error! can't declare reference to reference

15. Effective Modern C++ Study
C++ Korea
void func(Widget& && param);
 void func(Widget& param);

16. Effective Modern C++ Study
C++ Korea
template<typename T>
void f(T&& fParam)
{
someFunc(std::forward<T>(fParam)); // forward fParam to
} // someFunc
template<typename T>
T&& forward(typename remove_reference<T>::type& param)
{
return static_cast<T&&>(param);
}

17. Effective Modern C++ Study
C++ Korea
Widget& && forward(typename
remove_reference<Widget&>::type& param)
{
return static_cast<Widget& &&>(param);
}
Widget& && forward(Widget& param)
{
return static_cast<Widget& &&>(param);
}
Widget& forward(Widget& param)
{
return static_cast<Widget&>(param);
}

18. Effective Modern C++ Study
C++ Korea
Widget&& forward(typename
remove_reference<Widget>::type& param)
{
return static_cast<Widget&&>(param);
}
Widget&& forward(Widget& param)
{
return static_cast<Widget&&>(param);
}

19. Effective Modern C++ Study
C++ Korea
template<typename T>
T&& forward(remove_reference_t<T>& param)
{
return static_cast<T&&>(param);
}

20. Effective Modern C++ Study
C++ Korea
template<typename T>
void func(T&& param);
Widget widgetFactory(); // function returning rvalue
Widget w; // a variable (an lvalue)
func(w); // call func with lvalue; T deduced
// to be Widget&
func(widgetFactory()); // call func with rvalue; T deduced
// to be Widget

21. Effective Modern C++ Study
C++ Korea
auto&& w1 = w;
Widget& && w1 = w;
auto&& w2 = widgetFactory();
Widget&& w2 = widgetFactory();

22. Effective Modern C++ Study
C++ Korea
template<typename T>
class Widget {
public:
typedef T&& RvalueRefToT;
};
Widget<int&> w;
typedef int& && RvalueRefToT;
typedef int& RvalueRefToT;

23. Effective Modern C++ Study
C++ Korea

24. Effective Modern C++ Study
C++ Korea