Namespace
Varianti

std::tuple::tuple

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< 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
 
Defined in header <tuple>
constexpr tuple();
(1) (dal C++11)
explicit tuple( const Types&... args );
(2) (dal C++11)
template< class... UTypes >
explicit tuple( UTypes&&... args );
(3) (dal C++11)
template< class... UTypes >
tuple( const tuple<UTypes...>& other );
(4) (dal C++11)
template <class... UTypes>
tuple( tuple<UTypes...>&& other );
(5) (dal C++11)
template< class U1, class U2 >
tuple( const pair<U1,U2>& p );
(6) (dal C++11)
template< class U1, class U2 >
tuple( pair<U1,U2>&& p );
(7) (dal C++11)
tuple( const tuple& other ) = default;
(8) (dal C++11)
tuple( tuple&& other ) = default;
(9) (dal C++11)
template< class Alloc >
tuple( std::allocator_arg_t, const Alloc& a );
(10) (dal C++11)
template< class Alloc >
tuple( std::allocator_arg_t, const Alloc& a, const Types&... args );
(11) (dal C++11)
template< class Alloc, class... UTypes >
tuple( std::allocator_arg_t, const Alloc& a, UTypes&&... args );
(12) (dal C++11)
template <class Alloc, class... UTypes>
tuple( std::allocator_arg_t, const Alloc& a, const tuple<UTypes...>& other );
(13) (dal C++11)
template< class Alloc, class... UTypes >
tuple( std::allocator_arg_t, const Alloc& a, tuple<UTypes...>&& other );
(14) (dal C++11)
template< class Alloc, class U1, class U2 >
tuple( std::allocator_arg_t, const Alloc& a, const pair<U1, U2>& p );
(15) (dal C++11)
template< class Alloc, class U1, class U2 >
tuple( std::allocator_arg_t, const Alloc& a, pair<U1, U2>&& p );
(16) (dal C++11)
template< class Alloc >
tuple( std::allocator_arg_t, const Alloc& a, const tuple& other );
(17) (dal C++11)
template< class Alloc >
tuple( std::allocator_arg_t, const Alloc& a, tuple&& other );
(18) (dal C++11)
Costruisce una nuova tupla.
Original:
Constructs a new tuple.
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1)
Costruttore di default. Valore-inizializza tutti gli elementi.
Original:
Default constructor. Value-initializes all elements.
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2)
Inizializza ogni elemento della tupla con il parametro corrispondente.
Original:
Initializes each element of the tuple with the corresponding parameter.
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3)
Inizializza ogni elemento della tupla con il valore corrispondente in std::forward<Utypes>(args).
Original:
Initializes each element of the tuple with the corresponding value in std::forward<Utypes>(args).
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4)
Per ogni i in sizeof...(UTypes), inizializza-esimo elemento della tupla con std::get<i>(other).
Original:
For all i in sizeof...(UTypes), initializes ith element of the tuple with std::get<i>(other).
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5)
Per ogni i in sizeof...(UTypes), inizializza-esimo elemento della tupla con std::forward<Ui>(std::get<i>(other)).
Original:
For all i in sizeof...(UTypes), initializes ith element of the tuple with std::forward<Ui>(std::get<i>(other)).
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6)
Costruisce un 2-elemento tupla con il primo elemento costruito p.first e il secondo elemento dal p.second
Original:
Constructs a 2-element tuple with the first element constructed from p.first and the second element from p.second
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7)
Costruisce un 2-elemento tupla con il primo elemento costruito std::forward<U1>(p.first) e il secondo elemento dal std::forward<U2>(p.second)
Original:
Constructs a 2-element tuple with the first element constructed from std::forward<U1>(p.first) and the second element from std::forward<U2>(p.second)
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8)
Generato dal compilatore costruttore di copia. Inizializza ogni elemento della tupla con l'elemento corrispondente di other
Original:
Compiler-generated copy constructor. Initializes each element of the tuple with the corresponding element of other
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9)
Generato dal compilatore costruttore mossa. Inizializza ogni elemento i-esimo della tupla con std::forward<Ui>(std::get<i>(other)).
Original:
Compiler-generated move constructor. Initializes each ith element of the tuple with std::forward<Ui>(std::get<i>(other)).
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10 - 18) Identico a 1-9 se non ogni elemento è stato creato da uso-allocatore di costruzione, che viene, viene passato l'oggetto a Allocator come un ulteriore argomento al costruttore di ogni elemento per il quale è std::uses_allocator<Ui, Alloc>::value true.
Original:
10 - 18) Identical to 1-9 except each element is created by uses-allocator construction, that is, the Allocator object a is passed as an additional argument to the constructor of each element for which std::uses_allocator<Ui, Alloc>::value is true.
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[modifica] Parametri

args -
valori utilizzati per inizializzare ogni elemento della tupla
Original:
values used to initialize each element of the tuple
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other -
una tupla di valori utilizzati per inizializzare ogni elemento del tupe
Original:
a tuple of values used to initialize each element of the tupe
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p -
coppia di valori utilizzati per inizializzare entrambi gli elementi di questa 2-tupla
Original:
pair of values used to initialize both elements of this 2-tuple
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a -
allocatore di utilizzare in applicazioni-allocatore di costruzione
Original:
allocator to use in uses-allocator construction
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[modifica] Esempio

#include <iostream>
#include <string>
#include <vector>
#include <tuple>
#include <memory>
 
// helper function to print a tuple of any size
template<class Tuple, std::size_t N>
struct TuplePrinter {
    static void print(const Tuple& t) 
    {
        TuplePrinter<Tuple, N-1>::print(t);
        std::cout << ", " << std::get<N-1>(t);
    }
};
 
template<class Tuple>
struct TuplePrinter<Tuple, 1>{
    static void print(const Tuple& t) 
    {
        std::cout << std::get<0>(t);
    }
};
 
template<class... Args>
void print(const std::tuple<Args...>& t) 
{
    std::cout << "(";
    TuplePrinter<decltype(t), sizeof...(Args)>::print(t);
    std::cout << ")\n";
}
// end helper function
 
int main()
{
    std::tuple<int, std::string, double> t1;
    std::cout << "Value-initialized: "; print(t1);
    std::tuple<int, std::string, double> t2(42, "Test", -3.14);
    std::cout << "Initialized with values: "; print(t2);
    std::tuple<char, std::string, int> t3(t2);
    std::cout << "Implicitly converted: "; print(t3);
    std::tuple<int, double> t4(std::make_pair(42, 3.14));
    std::cout << "Constructed from a pair"; print(t4);
 
    // given Allocator my_alloc with a single-argument constructor my_alloc(int)
    // use my_alloc(1) to allocate 10 ints in a vector
    std::vector<int, my_alloc> v(10, 1, my_alloc(1));
    // use my_alloc(2) to allocate 10 ints in a vector in a tuple
    std::tuple<int, std::vector<int, my_alloc>, double> t5(std::allocator_arg,
                                                           my_alloc(2), 42, v,  -3.14);
}

Output:

Value-initialized: (0, , 0)
Initialized with values: (42, Test, -3.14)
Implicitly converted: (*, Test, -3)
Constructed from a pair(42, 3.14)

[modifica] Vedi anche

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]