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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>

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< cpp‎ | utility‎ | tuple

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C++
 
Utilities-Bibliothek
 
std::tuple
Member-Funktionen
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Non-Member-Funktionen
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-Klassen
Original:
Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
definiert in Header <tuple>
template< std::size_t I, class T >
class tuple_element; /* undefined */
 (1) (seit C++11)
template< std::size_t I, class... Types >
class tuple_element< I, tuple<Types...> >;
 (2) (seit 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) (seit 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) (seit 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) (seit C++11)
Stellt der Kompilierung Typs indexiert Zugang zu den Arten der Elemente des Tupels .
Original:
Provides compile-type indexed access to the types of the elements of the tuple.
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Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

Mitglied Typ
Original:
Member type
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 Definition
type
die Art der Ith Element des Tupels, wo I in [0, sizeof...(Types))
Original:
the type of Ith element of the tuple, where I is in [0, sizeof...(Types))
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[Bearbeiten] Mögliche Implementierung

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;
};

[Bearbeiten] Beispiel

This section is incomplete
Reason: no example

[Bearbeiten] Siehe auch
ermittelt die Art der Elemente der array
Original:
obtains the type of the elements of array
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(class Template-Spezialisierung) [edit]
(C++11)
ermittelt die Art der Elemente der pair
Original:
obtains the type of the elements of pair
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(class Template-Spezialisierung) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/utility/tuple/tuple_element&oldid=30628“