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std::get(std::pair)

Da cppreference.com.
< cpp‎ | utility‎ | pair

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C++
 
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::pair
Membri funzioni
Original:
Member functions
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pair::pair
pair::operator=
pair::swap
Non membri funzioni
Original:
Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get(C++11)
Helper classi
Original:
Helper classes
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tuple_size(C++11)
tuple_element(C++11)
 
template< size_t N, class T1, class T2 >

typename std::tuple_element<I, std::pair<T1,T2> >::type&

    get( pair<T1, T2>& p );
 (1) (dal C++11)
template< size_t N, class T1, class T2 >

const typename std::tuple_element<I, std::pair<T1,T2> >::type&

    get( const pair<T1,T2>& p );
 (2) (dal C++11)
template< size_t N, class T1, class T2 >

typename std::tuple_element<I, std::pair<T1,T2> >::type&&

    get( std::pair<T1,T2>&& p );
 (3) (dal C++11)
Estrae un elemento dalla coppia con tupla-come l'interfaccia.
Original:
Extracts a element from the pair using tuple-like interface.
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Indice

[modifica] Parametri

p -
coppia il cui contenuto da estrarre
Original:
pair whose contents to extract
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[modifica] Valore di ritorno

1-2)
Restituisce p.first se N==0 e p.second se N==1.
Original:
Returns p.first if N==0 and p.second if N==1.
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3)
Restituisce std::forward<T1&&>(p.first) se N==0 e std::forward<T2&&>(p.second) se N==1
Original:
Returns std::forward<T1&&>(p.first) if N==0 and std::forward<T2&&>(p.second) if N==1
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[modifica] Eccezioni

1-3)
noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

#include <iostream>
#include <utility>
 
int main()
{
    auto p = std::make_pair(1, 3.14);
    std::cout << '(' << std::get<0>(p) << ", " << std::get<1>(p) << ')' << std::endl;
}

Output: 

(1, 3.14)


[modifica] Vedi anche
tupla accede elemento specificato
Original:
tuple accesses specified element
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