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std::make_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
 
Defined in header <tuple>
template< class... Types >
tuple<VTypes...> make_tuple( Types&&... args );
(dal C++11)

Creates a tuple object, deducing the target type from the types of arguments. The deduced types are std::decay<Ti>::type (transformed as if passed to a function by value) unless application of std::decay results in std::reference_wrapper<X> for some type X, in which case the deduced type is is X&.

[modifica] Parametri

args -
zero o più argomenti per costruire la tupla da
Original:
zero or more arguments to construct the tuple from
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[modifica] Valore di ritorno

A std::tuple object containing the given values.

[modifica] Esempio

#include <iostream>
#include <tuple>
#include <functional>
 
int main()
{
    auto t1 = std::make_tuple(10, "Test", 3.14);
    std::cout << "The value of t1 is "
              << "(" << std::get<0>(t1) << ", " << std::get<1>(t1)
              << ", " << std::get<2>(t1) << ")\n";
 
    int n = 1;
    auto t2 = std::make_tuple(std::ref(n), n);
    n = 7;
    std::cout << "The value of t2 is "
              << "(" << std::get<0>(t2) << ", " << std::get<1>(t2) << ")\n";
}

Output:

The value of t1 is (10, Test, 3.14)
The value of t2 is (7, 1)
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]