std::tie

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

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

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

Coppie e tuple Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Swap, in avanti e spostare Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::tuple

Membri funzioni 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 membri funzioni 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

forward_as_tuple

None

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

std::swap

get

Helper classi 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

 

Elemento definito nell'header <tuple>
template<class... Types> tuple<Types&...> tie( Types&... args);		(dal C++11)

Crea una tupla di riferimenti lvalue alle sue argomentazioni o istanze di std::ignore.

Original:

Creates a tuple of lvalue references to its arguments or instances of std::ignore.

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Parametri

args

-

zero o più argomenti lvalue per costruire la tupla da Original: zero or more lvalue arguments to construct the tuple from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

Un oggetto che contiene std::tuple referenes lvalue.

Original:

A std::tuple object containing lvalue referenes.

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Eccezioni

noexcept specification:  

noexcept

  (dal C++11)

Esempio

std::tie può essere utilizzato per introdurre confronto lessicografico di una struttura o di estrarre una tupla:

Original:

std::tie can be used to introduce lexicographical comparison to a struct or to unpack a tuple:

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#include <iostream>#include <string>#include <set>#include <tuple>   struct S {int n;std::string s;float d;bool operator<(const S& rhs)const{// compares n to rhs.n,// then s to rhs.s,// then d to rhs.dreturn std::tie(n, s, d)< std::tie(rhs.n, rhs.s, rhs.d);}};   int main(){std::set<S> set_of_s;// S is LessThanComparable   S value{42, "Test", 3.14};std::set<S>::iterator iter;bool inserted;// unpacks the return value of insert into iter and inserted std::tie(iter, inserted)= set_of_s.insert(value);if(inserted)std::cout<<"Value was inserted sucessfully\n";}

Output:

Value was inserted sucessfully

make_tuple	crea un oggetto tuple del tipo definito dai tipi di argomenti Original: creates a tuple object of the type defined by the argument types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)
forward_as_tuple	crea un tuple di riferimenti rvalue Original: creates a tuple of rvalue references The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)
tuple_cat	crea un tuple concatenando un numero qualsiasi di tuple Original: creates a tuple by concatenating any number of tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)
ignore	segnaposto per saltare un elemento quando si scompatta un tuple utilizzando tie Original: placeholder to skip an element when unpacking a tuple using tie The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (costante)