Can c++11 parameter packs be used outside templates?

Question

I was wondering if I could have parameter packs consisting of a single, explicitly specified, type. For example, something like this:

#include 

        

Answer 1

You might specify the type you want to show:

#include 

template
void show_type() {}

template
void show_type(const T& x, Rest... rest)
{
    std::cout << x << std::endl;
    show_type(rest...);
}

template
void foo(int x, Args... args)
{
    show_type(x, args...);
}

struct X { };
std::ostream& operator<<(std::ostream& o, X)
{
    o << "x";
    return o;
}


int main()
{
    foo(1, 2, 3);
    foo(1, 2, 3.0); // Implicit conversion
    // or just
    show_type(1, 2, 3);
    foo(1, 2, X()); // Fails to compile
}