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std::pair::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)
 
pair();
constexpr pair();
(1) (bis C + +11)
(seit C++11)
pair( const T1& x, const T2& y );
(2)
template< class U1, class U2 >
pair( U1&& x, U2&& y );
(3) (seit C++11)
template< class U1, class U2 >
pair( const pair<U1,U2>& p );
(4)
template< class U1, class U2 >
pair( pair<U1,U2>&& p );
(5) (seit C++11)
template< class... Args1, class... Args2 >

pair( std::piecewise_construct_t,
      std::tuple<Args1...> first_args,

      std::tuple<Args2...> second_args );
(6) (seit C++11)
pair( const pair& p ) = default;
(7)
pair( pair&& p ) = default;
(8) (seit C++11)


Erzeugt ein neues Paar .
Original:
Constructs a new pair.
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1)
Standardkonstruktor. Value-initialisiert beide Elemente des Paares, first und second .
Original:
Default constructor. Value-initializes both elements of the pair, first and second.
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2)
Initialisiert first mit x und second mit y .
Original:
Initializes first with x and second with y.
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3)
Initialisiert first mit std::forward<U1>(x) und second mit std::forward<U2>(y) .
Original:
Initializes first with std::forward<U1>(x) and second with std::forward<U2>(y).
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4)
Initialisiert first mit p.first und second mit p.second .
Original:
Initializes first with p.first and second with p.second.
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5)
Initialisiert first mit std::move<U1>(p.first) und second mit std::move<U2>(p.second) .
Original:
Initializes first with std::move<U1>(p.first) and second with std::move<U2>(p.second).
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6)
Leitet die Elemente first_args an den Konstruktor first und leitet die Elemente second_args an den Konstruktor second. Dies ist der einzige Nicht-Standard-Konstruktor, verwendet, um ein Paar von nicht-kopierbaren nicht beweglichen Typen erstellt werden können .
Original:
Forwards the elements of first_args to the constructor of first and forwards the elements of second_args to the constructor of second. This is the only non-default constructor that can be used to create a pair of non-copyable non-movable types.
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7)
Copy-Konstruktor wird implizit generiert .
Original:
Copy constructor is implicitly generated.
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8)
Verschieben Konstruktor wird implizit erzeugt .
Original:
Move constructor is implicitly generated.
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[Bearbeiten] Parameter

x -
Wert, um das erste Element von diesem Paar zu initialisieren
Original:
value to initialize the first element of this pair
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y -
Wert, um das zweite Element von diesem Paar zu initialisieren
Original:
value to initialize the second element of this pair
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p -
Wertepaar verwendet, um beide Elemente dieses Paares zu initialisieren
Original:
pair of values used to initialize both elements of this pair
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first_args -
Tupel von Konstruktorargumente um das erste Element dieses Paares zu initialisieren
Original:
tuple of constructor arguments to initialize the first element of this pair
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second_args -
Tupel von Konstruktorargumente um das zweite Element dieses Paares zu initialisieren
Original:
tuple of constructor arguments to initialize the second element of this pair
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[Bearbeiten] Beispiel

#include <utility>
#include <string>
#include <complex>
#include <tuple>
#include <iostream>
int main()
{
    std::pair<int, float> p1;
    std::cout << "Value-initialized: "
              << p1.first << ", " << p1.second << '\n';
 
    std::pair<int, double> p2(42, 0.123);
    std::cout << "Initialized with two values: "
              << p2.first << ", " << p2.second << '\n';
 
    std::pair<char, int> p4(p2);
    std::cout << "Implicitly converted: "
              << p4.first << ", " << p4.second << '\n';
 
    std::pair<std::complex<double>, std::string> p6(
                    std::piecewise_construct, 
                    std::forward_as_tuple(0.123, 7.7),
                    std::forward_as_tuple(10, 'a'));
    std::cout << "Piecewise constructed: "
              << p6.first << ", " << p6.second << '\n';
}

Output:

Value-initialized: 0, 0
Initialized with two values: 42, 0.123
Implicitly converted: *, 0
Piecewise constructed: (0.123,7.7), aaaaaaaaaa

[Bearbeiten] Siehe auch

schafft eine pair Objekt des Typs, durch das Argument definiert
Original:
creates a pair object of type, defined by the argument types
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(Funktions-Template) [edit]