std::pair::pair

 

C++

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Bibliothèque pour le calcul numérique

Bibliothèque pour les entrées/sorties

Bibliothèque pour la régionalisation

Bibliothèque pour les expressions régulières (C++11)

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Bibliothèque d'utilitaires

Soutien des types fondamentaux (basic types, RTTI, type traits)

Gestion dynamique de la mémoire

Gestion d'erreur

Soutien à l'exécution

Fonctions variadic

Date et heure

Foncteurs

initializer_list (C++11)

bitset

hash (C++11)

Opérateurs relationnels

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Paires et tuples

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

swap, forward et move

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::pair

Les fonctions membres 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

Tiers fonctions 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)

Classes d'aide Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size (C++11)

tuple_element (C++11)

 

pair(); constexpr pair();	(1)	(jusqu'à C++11) (depuis C++11)
pair( const T1& x, const T2& y );	(2)
template< class U1, class U2 > pair( U1&& x, U2&& y );	(3)	(depuis 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)	(depuis C++11)
template< class... Args1, class... Args2 > pair( std::piecewise_construct_t,       std::tuple<Args1...> first_args,       std::tuple<Args2...> second_args );	(6)	(depuis C++11)
pair( const pair& p ) = default;	(7)
pair( pair&& p ) = default;	(8)	(depuis C++11)

Construit une nouvelle paire .

Original:

Constructs a new pair.

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1)

Constructeur par défaut. Valeur-initialise les deux éléments de la paire, et first second .

Original:

Default constructor. Value-initializes both elements of the pair, first and second.

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2)

Initialise first avec x et second avec y .

Original:

Initializes first with x and second with y.

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3)

Initialise first avec std::forward<U1>(x) et second avec std::forward<U2>(y) .

Original:

Initializes first with std::forward<U1>(x) and second with std::forward<U2>(y).

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4)

Initialise first avec p.first et second avec p.second .

Original:

Initializes first with p.first and second with p.second.

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5)

Initialise first avec std::move<U1>(p.first) et second avec 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)

Transmet les éléments de first_args au constructeur de first et transmet les éléments de second_args au constructeur de second. C'est le seul non-constructeur par défaut qui peut être utilisé pour créer une paire de non copiables non mobiles types .

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)

Constructeur de copie est implicitement généré .

Original:

Copy constructor is implicitly generated.

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8)

Déplacer constructeur est implicitement généré .

Original:

Move constructor is implicitly generated.

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Paramètres

x	-	pour initialiser la valeur du premier élément de cette paire 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	-	pour initialiser la valeur du second élément de cette paire 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	-	Combinaison de valeurs utilisées pour initialiser les éléments de cette paire 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	-	uplet d'arguments de constructeur pour initialiser le premier élément de cette paire 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	-	uplet d'arguments de constructeur pour initialiser le second élément de cette paire 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.

Exemple

#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';
}

Résultat :

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

Voir aussi

make_pair	crée un objet de type pair, définie par le type des arguments 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. (fonction générique)