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std::pair::pair

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< cpp‎ | utility‎ | pair

 
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
De tratamento de erros
Utilidades do programa
Variadic funções
Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
std::pair
Funções de membro
Original:
Member functions
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pair::pair
pair::operator=
pair::swap
Não-membros funções
Original:
Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get(C++11)
Classes auxiliares
Original:
Helper classes
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tuple_size(C++11)
tuple_element(C++11)
 
pair();
constexpr pair();
(1) (até C + 11)
(a partir do C++ 11)
pair( const T1& x, const T2& y );
(2)
template< class U1, class U2 >
pair( U1&& x, U2&& y );
(3) (a partir do 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) (a partir do C++ 11)
template< class... Args1, class... Args2 >

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

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


Constrói um novo par.
Original:
Constructs a new pair.
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1)
Construtor padrão. Valor inicializa ambos os elementos do casal, first e second.
Original:
Default constructor. Value-initializes both elements of the pair, first and second.
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2)
Inicializa first com x e second com y.
Original:
Initializes first with x and second with y.
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3)
Inicializa first com std::forward<U1>(x) e second com 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 com p.first e second com p.second.
Original:
Initializes first with p.first and second with p.second.
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5)
Inicializa first com std::move<U1>(p.first) e second com 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)
Encaminha os elementos de first_args para o construtor de first e encaminha os elementos de second_args para o construtor de second. Este é o construtor não padrão único que pode ser usado para criar um par de não-copiáveis ​​não-móveis 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)
Construtor de cópia é implicitamente gerado.
Original:
Copy constructor is implicitly generated.
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8)
Construtor movimento é gerado implicitamente.
Original:
Move constructor is implicitly generated.
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[editar] Parâmetros

x -
valor para inicializar o primeiro elemento do par
Original:
value to initialize the first element of this pair
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y -
valor para inicializar o segundo elemento do par
Original:
value to initialize the second element of this pair
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p -
par de valores usados ​​para inicializar os elementos deste par
Original:
pair of values used to initialize both elements of this pair
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first_args -
tupla de argumentos do construtor para inicializar o primeiro elemento do par
Original:
tuple of constructor arguments to initialize the first element of this pair
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second_args -
tupla de argumentos do construtor para inicializar o segundo elemento do par
Original:
tuple of constructor arguments to initialize the second element of this pair
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[editar] Exemplo

#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

[editar] Veja também

cria um objeto do tipo pair, definido pelos tipos de argumento
Original:
creates a pair object of type, defined by the argument types
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(modelo de função) [edit]