Function for_each

src/rpp/rpp/utils/utils.hpp:82–85

    template<typename Cont, std::invocable<iterable_value_t<Cont>> Fn>
    void for_each(Cont&& container, Fn&& fn)
    {
        std::for_each(std::begin(container), std::end(container), std::forward<Fn>(fn));
    }

    template<typename Cont, std::predicate<iterable_value_t<Cont>> Fn>
    bool all_of(const Cont& container, const Fn& fn)