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

If you need space only between numbers (and not after the last or before the first too), you might do:

template 
void print_seq(std::index_sequence)
{
    const char* sep = "";
    (((std::cout << sep << Is), sep = " "), ...);
}

Demo