#include <iostream>
#include <tuple>
//c++11写法
namespace detail
{
template<int... Is>
struct seq { };
template<int N, int... Is>
struct gen_seq : gen_seq<N - 1, N - 1, Is...> { };
template<int... Is>
struct gen_seq<0, Is...> : seq<Is...> { };
}
namespace detail
{
template<typename T, typename F, int... Is>
void for_each_c11(T&& t, F f, seq<Is...>)
{
auto l = { (f(std::get<Is>(t)),0)... };
}
}
template<typename... Ts, typename F>
void for_each_in_tuple_c11(std::tuple<Ts...> const& t, F f)
{
detail::for_each_c11(t, f, detail::gen_seq<sizeof...(Ts)>());
}
//c++14
template<typename T, typename F, int... Is>
void for_each_c14(T&& t, F f,std::integer_sequence<int,Is...>)
{
auto l = { (f(std::get<Is>(t)),0)... };
}
template<typename... Ts, typename F>
void for_each_in_tuple_c14(std::tuple<Ts...> const& t, F f)
{
for_each_c14(t, f,std::make_integer_sequence<int,sizeof...(Ts)>());
}
int main()
{
auto datas = std::make_tuple<int>(1, 2, 3, 4);
std::apply([](auto&& ... args) {
((std::cout << args << std::endl),...);
}, datas);
std::cout << "....." << std::endl;
for_each_in_tuple_c11(datas,[](auto value) {
std::cout << value << std::endl;
});
std::cout << "....." << std::endl;
for_each_in_tuple_c14(datas, [](auto value) {
std::cout << value << std::endl;
});
}