Espaços nominais
Variantes
Acções

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>

Da cppreference.com
< cpp‎ | utility‎ | tuple

 
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
De tratamento de erros
Utilidades do programa
Variadic funções
Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
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
Funções de membro
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Não-membros funções
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 auxiliares
Original:
Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
Defined in header <tuple>
template< std::size_t I, class T >
class tuple_element; /* undefined */
(1) (a partir do C++ 11)
template< std::size_t I, class... Types >
class tuple_element< I, tuple<Types...> >;
(2) (a partir do 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) (a partir do 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) (a partir do 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) (a partir do C++ 11)
Fornece compilação do tipo de acesso indexado aos tipos de elementos do tuplo.
Original:
Provides compile-type indexed access to the types of the elements of the tuple.
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Índice

[editar] Tipos de membro

Tipo de membro
Original:
Member type
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Definition
type
o tipo de elemento Ith da tupla, onde I está na [0, sizeof...(Types))
Original:
the type of Ith element of the tuple, where I is in [0, sizeof...(Types))
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[editar] Possível implementação

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;
};

[editar] Exemplo

[editar] Veja também

obtém o tipo dos elementos de array
Original:
obtains the type of the elements of array
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(especialização modelo. classe) [edit]
obtém o tipo dos elementos de pair
Original:
obtains the type of the elements of pair
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(especialização modelo. classe) [edit]