std::tuple_size<std::tuple>

 

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rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

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tuple (C++11)

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piecewise_construct (C++11)

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swap

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std::tuple

Member-Funktionen Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple::tuple

tuple::operator=

tuple::swap

Non-Member-Funktionen Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_tuple

tie

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None

operator= operator!= operator< operator<= operator> operator>=

std::swap

get

Helper-Klassen Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

tuple_element

uses_allocator

ignore

 

definiert in Header <tuple>
template<class T > class tuple_size;/*undefined*/	(1)	(seit C++11)
template<class... Types> class tuple_size<tuple<Types...>>  :publicstd::integral_constant<std::size_t, sizeof...(Types)>{};	(2)	(seit C++11)
template<class T > class tuple_size<const T>  :publicstd::integral_constant<              typenamestd::remove_cv<decltype(std::tuple_size<T>::value)>::type,              std::tuple_size<Tp>::value>{};	(3)	(seit C++11)
template<class T > class tuple_size<volatile T >  :publicstd::integral_constant<              typenamestd::remove_cv<decltype(std::tuple_size<T>::value)>::type,              std::tuple_size<Tp>::value>{};	(4)	(seit C++11)
template<class T > class tuple_size<constvolatile T >  :publicstd::integral_constant<              typenamestd::remove_cv<decltype(std::tuple_size<T>::value)>::type,              std::tuple_size<Tp>::value>{};	(5)	(seit C++11)

Bietet Zugriff auf die Anzahl der Elemente in einem Tupel als Compile-Zeit konstanter Ausdruck .

Original:

Provides access to the number of elements in a tuple as a compile-time constant expression.

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Inherited from std::integral_constant

Member constants

value [statisch]	sizeof...(Types) (public static Mitglied konstanten)

Member functions

operator std::size_t	wandelt das Objekt std::size_t, gibt value Original: converts the object to std::size_t, returns value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)

Member types

Type Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition
value_type	std::size_t
type	std::integral_constant<std::size_t, value>

Beispiel

#include <iostream>#include <tuple>   template<class T>void test(T t){int a[std::tuple_size<T>::value];// can be used at compile timestd::cout<<std::tuple_size<T>::value<<'\n';// or at run time}   int main(){ test(std::make_tuple(1, 2, 3.14));}

Output:

3

Siehe auch

std::tuple_size<std::array>	erhält die Größe eines array Original: obtains the size of an array The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (class Template-Spezialisierung)
std::tuple_size<std::pair> (C++11)	erhält die Größe eines pair Original: obtains the size of a pair The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (class Template-Spezialisierung)
std::get(std::tuple)	Zugriff auf das angegebene Element des Tupels Original: tuple accesses specified element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)
tuple_element	erhält den Typ des angegebenen Elements Original: obtains the type of the specified element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (class Template-Spezialisierung)