Type only function (no object required)

type_only_function.cpp

#include <iostream>

struct printer
{
    template <class T>
    constexpr void operator()(const T& t) const {
        std::cout << t << '\n';
    }
};

template <class F, int... Args>
struct test_t
{
    constexpr void operator()() const {
        (F{}(Args), ...);
    }
};

constexpr test_t<printer, 42, 107, 11> test;

int main()
{
    test();
}

42
107
11