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std::make_pair

Da cppreference.com.
< cpp‎ | utility‎ | pair

 
 
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)
 
Defined in header <utility>
template< class T1, class T2 >

std::pair<T1,T2> make_pair( T1 t, T2 u );
template< class T1, class T2 >

std::pair<V1,V2> make_pair( T1&& t, T2&& u );
(C fino + 11)

(dal C++11)
Crea un oggetto std::pair, dedurre il tipo di destinazione dai tipi di argomenti.
Original:
Creates a std::pair object, deducing the target type from the types of arguments.
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I tipi sono dedotte std::decay<T1>::type e std::decay<T2>::type (le trasformazioni di tipo applicando i consueti argomenti di funzioni passati per valore) salvo applicazione di risultati std::decay in std::reference_wrapper<X> per qualche tipo X, nel qual caso il tipo viene dedotto è X&. (dal C++11)
Original:
The deduced types are std::decay<T1>::type and std::decay<T2>::type (the usual type transformations applied to arguments of functions passed 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&. (dal C++11)
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[modifica] Parametri

t, u -
i valori di costruire la coppia da
Original:
the values to construct the pair from
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[modifica] Valore di ritorno

un oggetto std::pair contenente i valori indicati.
Original:
an std::pair object containing the given values.
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[modifica] Esempio

#include <iostream>
#include <utility>
#include <functional>
 
int main()
{
    int n = 1;
    int a[5] = {1,2,3,4,5};
 
    // build a pair from two ints
    auto p1 = std::make_pair(n, a[1]);
    std::cout << "The value of p1 is "
              << "(" << p1.first << ", " << p1.second << ")\n";
 
    // build a pair from a reference to int and an array (decayed to pointer)
    auto p2 = std::make_pair(std::ref(n), a);
    n = 7;
    std::cout << "The value of p2 is "
              << "(" << p2.first << ", " << *(p2.second+1) << ")\n";
}

Output:

The value of p1 is (1, 2)
The value of p2 is (7, 2)