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std::get(std::tuple)

STD：获取%28 std：：tuple%29

​(1)​
template< std::size_t I, class... Types > typename std::tuple_element<I, tuple<Types...> >::type& get( tuple<Types...>& t (since C++11) (until C++14)
template< std::size_t I, class... Types > constexpr std::tuple_element_t<I, tuple<Types...> >& get( tuple<Types...>& t (since C++14)
​(2)​
template< std::size_t I, class... Types > typename std::tuple_element<I, tuple<Types...> >::type&& get( tuple<Types...>&& t (since C++11) (until C++14)
template< std::size_t I, class... Types > constexpr std::tuple_element_t<I, tuple<Types...> >&& get( tuple<Types...>&& t (since C++14)
​(3)​
template< std::size_t I, class... Types > typename std::tuple_element<I, tuple<Types...> >::type const& get( const tuple<Types...>& t (since C++11) (until C++14)
template< std::size_t I, class... Types > constexpr std::tuple_element_t<I, tuple<Types...> >const& get( const tuple<Types...>& t (since C++14)
template< std::size_t I, class... Types > constexpr std::tuple_element_t<I, tuple<Types...> >const&& get( const tuple<Types...>&& t (4)(since C++17)
template< class T, class... Types > constexpr T& get(tuple<Types...>& t(5)(since C++14)
template< class T, class... Types > constexpr T&& get(tuple<Types...>&& t(6)(since C++14)
template< class T, class... Types > constexpr const T& get(const tuple<Types...>& t(7)(since C++14)
template< class T, class... Types > constexpr const T&& get(const tuple<Types...>&& t(8)(since C++17)

1-4%29提取Ith元组中的元素。I中的整数值。[0, sizeof...(Types))...

5-8%29提取元组的元素。t他的类型是T如果元组有多个该类型的元素，则无法编译。

参数

t-tuple whose contents to extract

返回值

的选定元素的引用。t...

例外

noexcept规格：

noexcept

例

二次

#include <iostream>
#include <string>
#include <tuple>
 
int main()
{
    auto t = std::make_tuple(1, "Foo", 3.14
    // index-based access
    std::cout << "(" << std::get<0>(t) << ", " << std::get<1>(t)
              << ", " << std::get<2>(t) << ")\n";
    // type-based access
    std::cout << "(" << std::get<int>(t) << ", " << std::get<const char*>(t)
              << ", " << std::get<double>(t) << ")\n";
}

二次

产出：

二次

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

二次

另见

std::get(std::array)accesses an element of an array (function template)
std::get(std::pair) (C++11)accesses an element of a pair (function template)
std::get(std::variant) (C++17)reads the value of the variant given the index or the type (if the type is unique), throws on error (function template)

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