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>
De cppreference.com
| Definido en el archivo de encabezado <tuple>
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template< std::size_t I, class T >
class tuple_element; /* undefined */
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(1) | (desde C++11) |
template< std::size_t I, class... Types >
class tuple_element< I, tuple<Types...> >;
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(2) | (desde 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;
};
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(3) | (desde 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;
};
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(4) | (desde 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;
};
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(5) | (desde C++11) |
Proporciona compilación tipo de acceso indexado a los tipos de los elementos de la tupla .
Original:
Provides compile-type indexed access to the types of the elements of the tuple.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Tipos de miembros
Miembro de tipo
Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
| type | el tipo de elemento
Ith de la tupla, donde I es en [0, sizeof...(Types)) Original: the type of Ith element of the tuple, where I is in [0, sizeof...(Types)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Posible implementación
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;
};
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Ejemplo
| Esta sección está incompleta Razón: sin ejemplo |