Namespace
Varianti

std::tuple

Da cppreference.com.
< cpp‎ | utility


 
 
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
 
Defined in header <tuple>
template< class... Types >
class tuple;
(dal C++11)
Modello std::tuple classe è un insieme di dimensioni fisse di valori eterogenei. Si tratta di una generalizzazione di std::pair.
Original:
Class template std::tuple is a fixed-size collection of heterogeneous values. It is a generalization of std::pair.
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Indice

[modifica] Membri funzioni

costruisce un nuovo tuple
Original:
constructs a new tuple
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(membro pubblico funzione)
assegna il contenuto di una tuple all'altro
Original:
assigns the contents of one tuple to another
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(membro pubblico funzione)
scambia il contenuto di due tuples
Original:
swaps the contents of two tuples
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(membro pubblico funzione)

[modifica] Non membri funzioni

crea un oggetto tuple del tipo definito dai tipi di argomenti
Original:
creates a tuple object of the type defined by the argument types
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(funzione di modello) [edit]
crea un tuple di riferimenti lvalue o spacchetta una tupla in singoli oggetti
Original:
creates a tuple of lvalue references or unpacks a tuple into individual objects
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(funzione di modello) [edit]
crea un tuple di riferimenti rvalue
Original:
creates a tuple of rvalue references
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(funzione di modello) [edit]
crea un tuple concatenando un numero qualsiasi di tuple
Original:
creates a tuple by concatenating any number of tuples
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(funzione di modello) [edit]
tupla accede elemento specificato
Original:
tuple accesses specified element
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(funzione di modello) [edit]
lessicografico confronta i valori nella tupla
Original:
lexicographically compares the values in the tuple
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(funzione di modello) [edit]
specializzata l'algoritmo std::swap
Original:
specializes the std::swap algorithm
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(funzione di modello) [edit]

[modifica] Helper classi

ottiene la dimensione della tuple al momento della compilazione
Original:
obtains the size of tuple at compile time
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(classe modello di specializzazione) [edit]
ottiene il tipo dell'elemento specificato
Original:
obtains the type of the specified element
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(classe modello di specializzazione) [edit]
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(classe modello di specializzazione) [edit]
segnaposto per saltare un elemento quando si scompatta un tuple utilizzando tie
Original:
placeholder to skip an element when unpacking a tuple using tie
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(costante) [edit]

[modifica] Esempio

#include <tuple>
#include <iostream>
#include <string>
#include <stdexcept>
 
std::tuple<double, char, std::string> get_student(int id)
{
    if (id == 0) return std::make_tuple(3.8, 'A', "Lisa Simpson");
    if (id == 1) return std::make_tuple(2.9, 'C', "Milhouse Van Houten");
    if (id == 2) return std::make_tuple(1.7, 'D', "Ralph Wiggum");
    throw std::invalid_argument("id");
}
 
int main()
{
    auto student0 = get_student(0);
    std::cout << "ID: 0, "
              << "GPA: " << std::get<0>(student0) << ", "
              << "grade: " << std::get<1>(student0) << ", "
              << "name: " << std::get<2>(student0) << '\n';
 
    double gpa1;
    char grade1;
    std::string name1;
    std::tie(gpa1, grade1, name1) = get_student(1);
    std::cout << "ID: 1, "
              << "GPA: " << gpa1 << ", "
              << "grade: " << grade1 << ", "
              << "name: " << name1 << '\n';
}

Output:

ID: 0, GPA: 3.8, grade: A, name: Lisa Simpson
ID: 1, GPA: 2.9, grade: C, name: Milhouse Van Houten