Varianti

    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>

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    <metanoindex/>

     
    C++
     
    Utilità libreria
    Tipo di supporto (basic types, RTTI, type traits)
    Gestione della memoria dinamica
    La gestione degli errori
    Programma di utilità
    Funzioni variadic
    Data e ora
    Funzione oggetti
    initializer_list(C++11)
    bitset
    hash(C++11)
    Gli operatori relazionali
    Original:
    Relational operators
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    rel_ops::operator!=
    rel_ops::operator>
    rel_ops::operator<=
    rel_ops::operator>=
    Coppie e tuple
    Original:
    Pairs and tuples
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    pair
    tuple(C++11)
    piecewise_construct_t(C++11)
    piecewise_construct(C++11)
    Swap, in avanti e spostare
    Original:
    Swap, forward and move
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    swap
    forward(C++11)
    move(C++11)
    move_if_noexcept(C++11)
    declval(C++11)
     
    std::tuple
    Membri funzioni
    Original:
    Member functions
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    tuple::tuple
    tuple::operator=
    tuple::swap
    Non membri funzioni
    Original:
    Non-member functions
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    make_tuple
    tie
    forward_as_tuple
    None
    operator=
    operator!=
    operator<
    operator<=
    operator>
    operator>=
    std::swap
    get
    Helper classi
    Original:
    Helper classes
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    tuple_size
    tuple_element
    uses_allocator
    ignore
     
    <tbody> </tbody>
    Elemento definito nell'header <tuple>
    template< std::size_t I, class T > class tuple_element; /* undefined */
    		 (1) (dal C++11)
    template< std::size_t I, class... Types > class tuple_element< I, tuple<Types...> >;
    		 (2) (dal 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) (dal 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) (dal 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) (dal C++11)
    Fornisce di compilazione tipo di accesso indicizzato ai tipi di elementi della tupla.
    Original:
    Provides compile-type indexed access to the types of the elements of the tuple.
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    Membri tipi

    Membro tipo
    Original:
    Member type
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    		 Definition
    type
    il tipo di elemento Ith della tupla, dove è in I [0, sizeof...(Types))
    Original:
    the type of Ith element of the tuple, where I is in [0, sizeof...(Types))
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    Possibile implementazione

    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;
};

    Esempio

    This section is incomplete
    Reason: no example

    Vedi anche
    ottiene il tipo di elementi di array
    Original:
    obtains the type of the elements of array
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    (classe modello di specializzazione) [modifica]
    (C++11)
    ottiene il tipo di elementi di pair
    Original:
    obtains the type of the elements of pair
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    (classe modello di specializzazione) [modifica]