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std::make_pair

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< cpp‎ | utility‎ | pair

 
 
 
std::pair
Member-Funktionen
Original:
Member functions
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pair::pair
pair::operator=
pair::swap
Non-Member-Funktionen
Original:
Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get(C++11)
Helper-Klassen
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 );
(bis C + +11)

(seit C++11)
Erstellt eine std::pair Objekt, Ableitung der Zieltyp von den Typen von Argumenten .
Original:
Creates a std::pair object, deducing the target type from the types of arguments.
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Die abgeleiteten Typen sind std::decay<T1>::type und std::decay<T2>::type (die üblichen Typs Transformationen auf Argumente von Funktionen Wert übergeben aufgebracht), sofern Anwendung std::decay führt std::reference_wrapper<X> für irgendeine Art X, in welchem ​​Fall die abgeleitete Typ ist X& wird. (seit 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&. (seit C++11)
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[Bearbeiten] Parameter

t, u -
die Werte, um das Paar aus zu bauen
Original:
the values to construct the pair from
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[Bearbeiten] Rückgabewert

ein std::pair Objekt mit den angegebenen Werten .
Original:
an std::pair object containing the given values.
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[Bearbeiten] Beispiel

#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)