c++模板元编程五：switch/case语句编译时运行

// test case
cout << "test case" << endl;
Case<2>::Run();

test case
case 2

template<int v>
class Case {
public:
  static inline void Run() {
    cout << "default case" << endl;
  }
};
template<>
class Case<1> {
public:
  static inline void Run() {
    cout << "case 1" << endl;
  }
};

template<>
class Case<2> {
public:
  static inline void Run() {
    cout << "case 2" << endl;
  }
};