template< std::size_t I, class… Types >typename std::tuple_element<I, tuple<Types…> >::type& get( tuple<Types…>& t ) noexcept;	(1)	(since C++11)(constexpr since C++14)
template< std::size_t I, class… Types >typename std::tuple_element<I, tuple<Types…> >::type&& get( tuple<Types…>&& t ) noexcept;	(2)	(since C++11)(constexpr since C++14)
template< std::size_t I, class… Types >typename std::tuple_element<I, tuple<Types…> >::type const& get( const tuple<Types…>& t ) noexcept;	(3)	(since C++11)(constexpr since C++14)
template< std::size_t I, class… Types >typename std::tuple_element<I, tuple<Types…> >::type const&& get( const tuple<Types…>&& t ) noexcept;	(4)	(since C++11)(constexpr since C++14)
template< class T, class… Types >constexpr T& get(tuple<Types…>& t) noexcept;	(5)	(since C++14)
template< class T, class… Types >constexpr T&& get(tuple<Types…>&& t) noexcept;	(6)	(since C++14)
template< class T, class… Types >constexpr const T& get(const tuple<Types…>& t) noexcept;	(7)	(since C++14)
template< class T, class… Types >constexpr const T&& get(const tuple<Types…>&& t) noexcept;	(8)	(since C++14)

eg.

#include <iostream> #include <string> #include <tuple>int main() {auto t = std::make_tuple(1, "Foo", 3.14);// index-based accessstd::cout << "(" << std::get<0>(t) << ", " << std::get<1>(t)<< ", " << std::get<2>(t) << ")\n";// type-based access (C++14 or later)std::cout << "(" << std::get<int>(t) << ", " << std::get<const char*>(t)<< ", " << std::get<double>(t) << ")\n";// Note: std::tie and structured binding may also be used to decompose a tuple }

Output:

(1, Foo, 3.14) (1, Foo, 3.14)

總結

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