err.cpp

#include <cstdlib>
#include <iostream>

static void err() {
    std::cerr << std::endl;
    exit(1);
}

template <typename First, typename... Rest>
static void err(First&& first, Rest&&... rest) {
    std::cerr << std::forward<First>(first);
    err(std::forward<Rest>(rest)...);
}

int main() {
    err(1, "2", 3.3);
    return 0;
}