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std::pair::pair

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< cpp‎ | utility‎ | pair

 
 
 
std::pair
Les fonctions membres
Original:
Member functions
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pair::pair
pair::operator=
pair::swap
Tiers fonctions
Original:
Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get (C++11)
Classes d'aide
Original:
Helper classes
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tuple_size (C++11)
tuple_element (C++11)
 
pair();
constexpr pair();
(1) (avant 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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[modifier] Paramètres

x -
pour initialiser la valeur du premier élément de cette paire
Original:
value to initialize the first element of this pair
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y -
pour initialiser la valeur du second élément de cette paire
Original:
value to initialize the second element of this pair
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p -
Combinaison de valeurs utilisées pour initialiser les éléments de cette paire
Original:
pair of values used to initialize both elements of this pair
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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
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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
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[modifier] 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

[modifier] Voir aussi

crée un objet de type pair, définie par le type des arguments
Original:
creates a pair object of type, defined by the argument types
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(fonction générique) [edit]