How do I expand a tuple into variadic template function's arguments?

Question

Consider the case of a templated function with variadic template arguments:

template Tret func(const T&... t);
         


        

Answer 1

This simple solution works for me:

template
void unwrap_tuple(std::tuple* tp)
{
    std::cout << "And here I have the tuple types, all " << sizeof...(T) << " of them" << std::endl;
}

int main()
{
    using TupleType = std::tuple;

    unwrap_tuple((TupleType*)nullptr); // trick compiler into using template param deduction
}