C++: Template of retrieving array size

 template<typename T, std::size_t S>  
 std::size_t SizeOf(T(&)[S]) {  
      return S;  
 }  
 int main()  
 {  
      double d[10];  
      cout << "d size is " << SizeOf(d) << endl;  
      char ch;  
      cin.getline(&ch, 1);  
     return 0;  
 }