How to reverse the order of arguments of a variadic template function?

Question

I have a template function with varargs template arguments, like this

template
void ascendingPrint(         


        

Answer 1

I think instead of reversing the arguments, you can reverse your logic! For example reverse the operations on arguments.

template 
void ascendingPrint(const T& x)
{
    cout << x << " ";
}

template
void ascendingPrint(const T& t, Args... args)
{
    ascendingPrint(t);                   // First print `t`
    ascendingPrint(args...);             // Then print others `args...`
}

template 
void descendingPrint(const T& x)
{
    cout << x << " ";
}

template
void descendingPrint(const T& t, Args... args)
{
    descendingPrint(args...);            // First print others `args...`
    descendingPrint(t);                  // Then print `t`
}

int main()
{
    ascendingPrint(1, 2, 3, 4);
    cout << endl;
    descendingPrint(1, 2, 3, 4);
}

Output

1 2 3 4 
4 3 2 1