default rule of five c 2b 2b

1class X
2{
3public:
4   X() = default;
5   
6   X(X const& other) = default;
7   X& operator=(X const& other) = default;
8   
9   X(X&& other) = default;
10   X& operator=(X&& other) = default;
11   
12   ~X() = default;
13};