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std::get(std::tuple)

Da cppreference.com.
< cpp‎ | utility‎ | tuple

 
 
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
 
template< std::size_t I, class... Types >

typename std::tuple_element<I, tuple<Types...> >::type&

    get( tuple<Types...>& t );
(1) (dal C++11)
template< std::size_t I, class... Types >

typename std::tuple_element<I, tuple<Types...> >::type&&

    get( tuple<Types...>&& t );
(2) (dal C++11)
template< std::size_t I, class... Types >

typename std::tuple_element<I, tuple<Types...> >::type const&

    get( const tuple<Types...>& t );
(3) (dal C++11)
Estrae l'elemento Ith elemento della tupla. I è un valore intero in [0, sizeof...(Types)).
Original:
Extracts the Ith element element from the tuple. I is an integer value in [0, sizeof...(Types)).
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Indice

[modifica] Parametri

t -
tupla il cui contenuto da estrarre
Original:
tuple whose contents to extract
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[modifica] Valore di ritorno

1)
Riferimento all'elemento Ith di t.
Original:
Reference to the Ith element of t.
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2)
Rvalue riferimento all'elemento di Ith t, a meno che l'elemento è di tipo lvalue riferimento, nel qual caso viene restituito lvalue riferimento.
Original:
Rvalue reference to the Ith element of t, unless the element is of lvalue reference type, in which case lvalue reference is returned.
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3)
Const riferimento all'elemento Ith di t.
Original:
Const reference to the Ith element of t.
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[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

#include <iostream>
#include <string>
#include <tuple>
 
int main()
{
    auto t = std::make_tuple(1, "Foo", 3.14);
    std::cout << "(" << std::get<0>(t) << ", " << std::get<1>(t)
              << ", " << std::get<2>(t) << ")\n";
}

Output:

(1, Foo, 3.14)

[modifica] Vedi anche

accesses an element of an array
(funzione di modello) [edit]
accede a un elemento di una pair
Original:
accesses an element of a pair
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(funzione di modello) [edit]