std::pair::pair

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std::pair

Member-Funktionen Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair::pair

pair::operator=

pair::swap

Non-Member-Funktionen Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_pair

operator= operator!= operator< operator<= operator> operator>=

std::swap

get (C++11)

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tuple_size (C++11)

tuple_element (C++11)

 

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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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Parameter

x	-	Wert, um das erste Element von diesem Paar zu initialisieren Original: value to initialize the first element of this pair The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
y	-	Wert, um das zweite Element von diesem Paar zu initialisieren Original: value to initialize the second element of this pair The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
p	-	Wertepaar verwendet, um beide Elemente dieses Paares zu initialisieren Original: pair of values used to initialize both elements of this pair The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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

Siehe auch

make_pair	schafft eine pair Objekt des Typs, durch das Argument definiert Original: creates a pair object of type, defined by the argument types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)