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    std::tuple_element<std::tuple>

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    <metanoindex/>

     
    C++
     
    Bibliothèque d'utilitaires
     
    std::tuple
    Les fonctions membres
    Original:
    Member functions
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    tuple::tuple
    tuple::operator=
    tuple::swap
    Tiers fonctions
    Original:
    Non-member functions
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    make_tuple
    tie
    forward_as_tuple
    None
    operator=
    operator!=
    operator<
    operator<=
    operator>
    operator>=
    std::swap
    get
    Classes d'aide
    Original:
    Helper classes
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    tuple_size
    tuple_element
    uses_allocator
    ignore
     
    <tbody> </tbody>
    Déclaré dans l'en-tête <tuple>
    template< std::size_t I, class T > class tuple_element; /* undefined */
    		 (1) (depuis C++11)
    template< std::size_t I, class... Types > class tuple_element< I, tuple<Types...> >;
    		 (2) (depuis C++11)
    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) (depuis C++11)
    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) (depuis C++11)
    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) (depuis C++11)
    Fournit la compilation type d'accès indexé à des types d'éléments du tuple .
    Original:
    Provides compile-type indexed access to the types of the elements of the tuple.
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    Types de membres

    Type du membre Définition
    type
    le type d'élément Ith du tuple, où I est en [0, sizeof...(Types))
    Original:
    the type of Ith element of the tuple, where I is in [0, sizeof...(Types))
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    Mise en œuvre possible

    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;
};

    Exemple

    This section is incomplete
    Reason: no example

    Voir aussi
    obtient le type des éléments de array
    Original:
    obtains the type of the elements of array
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    (classe générique spécialisée) [edit]
    (C++11)
    obtient le type des éléments de pair
    Original:
    obtains the type of the elements of pair
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    (classe générique spécialisée) [edit]