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std::tuple_element<div class="t-tr-text"><std::tuple><div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig"><std::tuple></div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

提供: cppreference.com
< cpp‎ | utility‎ | tuple

Defined in header <tuple>
template< std::size_t I, class T >
class tuple_element; /* undefined */
(1) (C++11およびそれ以降)
template< std::size_t I, class... Types >
class tuple_element< I, tuple<Types...> >;
(2) (C++11およびそれ以降)
template< std::size_t I, class T >

class tuple_element< I, const T > {
  typedef typename
      std::add_const<typename std::tuple_element<I, T>::type>::type type;

};
(3) (C++11およびそれ以降)
template< std::size_t I, class T >

class tuple_element< I, volatile T > {
  typedef typename
      std::add_volatile<typename std::tuple_element<I, T>::type>::type type;

};
(4) (C++11およびそれ以降)
template< size_t I, class T >

class tuple_element< I, const volatile T > {
  typedef typename
      std::add_cv<typename std::tuple_element<I, T>::type>::type type;

};
(5) (C++11およびそれ以降)
タプルの要素の型にコンパイル型インデックスによるアクセスを提供しています.
Original:
Provides compile-type indexed access to the types of the elements of the tuple.
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目次

[編集] メンバータイプ

メンバー·タイプ
Original:
Member type
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Definition
type
IIにあるタプルの[0, sizeof...(Types))th要素の型
Original:
the type of Ith element of the tuple, where I is in [0, sizeof...(Types))
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[編集] 可能な実装

template< std::size_t I, class T >
struct tuple_element;
 
// recursive case
template<std::size_t I, class Head, class... Tail >
struct tuple_element<I, std::tuple<Head, Tail...>>
    : std::tuple_element<I-1, std::tuple<Tail...>> { };
 
// base case
template< class Head, class... Tail >
struct tuple_element<0, std::tuple<Head, Tail...>> {
   typedef Head type;
};

[編集]

[編集] も参照してください

arrayの要素の型を取得します
Original:
obtains the type of the elements of array
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(クラステンプレートの特殊化の2つの値を比較します) [edit]
pairの要素の型を取得します
Original:
obtains the type of the elements of pair
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(クラステンプレートの特殊化の2つの値を比較します) [edit]