std::pair::pair

 

C++

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Expresiones biblioteca Regular (C++11)

Operaciones de biblioteca Atómica (C++11)

Tema Biblioteca de ayuda (C++11)

 

Utilidades de la biblioteca

Escriba apoyo (basic types, RTTI, type traits)

Gestión de memoria dinámica

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Programa de servicios públicos

Funciones variadic

Fecha y hora

Objetos Function

initializer_list (C++11)

bitset

hash (C++11)

Operadores relacionales Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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

Pares y tuplas Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Cambiar, hacia adelante y mover Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::pair

Las funciones miembro 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

Terceros funciones 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)

Clases de ayuda 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)	(hasta C + +11) (ya que C + +11)
pair( const T1& x, const T2& y );	(2)
template< class U1, class U2 > pair( U1&& x, U2&& y );	(3)	(ya que 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)	(ya que C + +11)
template< class... Args1, class... Args2 > pair( std::piecewise_construct_t,       std::tuple<Args1...> first_args,       std::tuple<Args2...> second_args );	(6)	(ya que C + +11)
pair( const pair& p ) = default;	(7)
pair( pair&& p ) = default;	(8)	(ya que C + +11)

Construye un nuevo par .

Original:

Constructs a new pair.

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1)

Por defecto constructor. Valor inicializa los dos elementos de la pareja, y first second .

Original:

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

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2)

Inicializa first con x y second con y .

Original:

Initializes first with x and second with y.

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3)

Inicializa first con std::forward<U1>(x) y second con std::forward<U2>(y) .

Original:

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

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4)

Inicializa first con p.first y second con p.second .

Original:

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

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5)

Inicializa first con std::move<U1>(p.first) y second con 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)

Reenvía los elementos de first_args al constructor de first y envía los elementos de second_args al constructor de second. Esta es la única no predeterminada constructor que se puede utilizar para crear un par de no copiables no móviles tipos .

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)

Constructor de copia se genera implícitamente .

Original:

Copy constructor is implicitly generated.

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8)

Mover constructor está implícitamente generada .

Original:

Move constructor is implicitly generated.

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Parámetros

x	-	valor para inicializar el primer elemento de este par 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	-	valor para inicializar el segundo elemento de este par 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	-	par de valores que se utilizan para inicializar ambos elementos de este par 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	-	tupla de argumentos de constructor para inicializar el primer elemento de este par 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	-	tupla de argumentos del constructor para inicializar el segundo elemento de este par 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.

Ejemplo

#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

Ver también

make_pair	se crea un objeto de tipo pair, definido por los tipos de argumentos 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. (función de plantilla)