C++ 遍历可变模板参数 iterate variadic template arguments

template<size_t I = 0, typename FuncT, typename ...Tp>
inline typename std::enable_if_t<I == sizeof ...(Tp)> for_each(std::tuple<Tp ...>&, FuncT)
{
}

template<size_t I = 0, typename FuncT, typename ...Tp>
inline typename std::enable_if_t<I < sizeof ...(Tp)> for_each(std::tuple<Tp ...>& t, FuncT f)
{
    f(std::get<I>(t));
    for_each<I + 1, FuncT, Tp...>(t, f);
}

template<typename ...Args>
auto print(Args ...args)
{
    auto a = std::forward_as_tuple(args...);
    for_each(a, [](auto x)
    {
        std::cout << typeid(x).name() << ":" << x << std::endl;
    });
}

int main()
{
    print(10, 'c', "bbb", string("123"));
}

结果如下：

int:10
char:c
char const *:bbb
class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char> >:123