variadic template

vt.cpp

#include <iostream> /// std::cerr
#include <cstdlib> /// #EXIT_SUCCESS

template <typename T>
void errorMsg (const T &t) {
    std::cerr << t << std::endl; /// this template function will be called when the size of the pack is 1 because this function
}                                /// is the best match for the call because of its exactly one argument and is a more specialized function

template <typename T, typename ...Tv> /// template parameter pack expands its list of elements that deduced from template arguments and applies a pattern to the corresponding function parameter pack
void errorMsg (const T &t1, const Tv &...tv) { /// that is each element has const & Tv whatever type had deduced
    std::cerr << t1 << std::endl; /// will print whatever type it is
    errorMsg (tv...); /// calls the function itself and expands its remaining elements in pack  t1 will be bound to the first elem of the pack which is string
}                    /// and the pack will be reduced depending on the size of the pack which is 3 and so on and so on until the remaining size of the pack is 1

int main ()
{
    errorMsg (2, "string", 2.33, 23.f, 's'); /// passing whatever type and number of arguments in the a template function

    return EXIT_SUCCESS; /// system dependent return value
}