Print spaces between each element using a fold expression

Question

I am using a fold expression to print elements in a variadic pack, but how do I get a space in between each element?

Currently the output is \"1 234\", the desired outpu

Answer 1

you can that

#include 

template
struct Facility
{
template
struct List
{
    static void print()
    {
     std::cout<<"\"" << head;
     ((std::cout << " " << list), ...);
      std::cout<<"\"";
    }
};
};

template
using IntList = typename Facility::List;
int main()
{
 using List1 = IntList<1,2,3,4>;
 List1::print();
}

the fold expression ((std::cout << " " << list), ...) will expands to ((std::cout << " " << list1), (std::cout << " " << list2), (std::cout << " " << list3)...)