方式一：递归 + 类模板特化方式

template<typename Tuple, std::size_t N>

struct tuple_printer

{

    static void print(const Tuple& t)

    {

        tuple_printer<Tuple, N - 1>::print(t);

        std::cout << ", " << std::get<N - 1>(t);

    }

};

template<typename Tuple>

struct tuple_printer<Tuple, 1>

{

    static void print(const Tuple& t)

    {

        std::cout << std::get<0>(t);

    }

};

template<typename... Args>

void print_tuple(const std::tuple<Args...>& t)

{

    tuple_printer<decltype(t), sizeof...(Args)>::print(t);

    std::cout << std::endl;

}

方式二：重载<<操作符 + 使用C++14的std::index_senquence

template<typename Char, typename Traits, typename Tuple, std::size_t... Index>

void print_tuple_impl(std::basic_ostream<Char, Traits>& os, const Tuple& t, std::index_sequence<Index...>)

{

    using swallow = int[]; // guaranties left to right order

    (void)swallow { 0, (void(os << (Index == 0 ? "" : ", ") << std::get<Index>(t)), 0)... };

}

template<typename Char, typename Traits, typename... Args>

decltype(auto) operator<<(std::basic_ostream<Char, Traits>& os, const std::tuple<Args...>& t)

{

    os << "(";

    print_tuple_impl(os, t, std::index_sequence_for<Args...>{});

    return os << ")";

}

使用：

std::tuple<int, short, double, char> tp = std::make_tuple(1, 2, 3, 'a');

// 使用方式一

print_tuple(tp);

// 使用方式二

std::cout << tp << std::endl;