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std::cin, std::wcin

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< cpp‎ | io

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C++
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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(obsoleta)
Streams
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Streams
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Abstrações
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Abstractions
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File I / O
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File I/O
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Cordas I / O
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String I/O
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Matriz de I / O
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Array I/O
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(obsoleta)
(obsoleta)
(obsoleta)
Tipos
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Types
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Interface de categoria de erro
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Error category interface
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(C++11)
(C++11)
 
std::basic_istream
Objetos globais
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Global objects
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cinwcin
Funções de membro
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada formatada
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Formatted input
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basic_istream::operator>>
Entrada não formatado
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Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Posicionamento
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Positioning
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basic_istream::tellg
basic_istream::seekg
Diversos
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Aulas-Membros
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Member classes
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basic_istream::sentry
Não-membros funções
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Non-member functions
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Definido no cabeçalho <iostream>
extern std::istream cin;
 (1)
extern std::wistream wcin;
 (2)
Os objectos globais std::cin e std::wcin entrada de controlo a partir de um fluxo de tampão de aplicação (tipo definido derivado de std::streambuf), associado com o padrão de fluxo de entrada C stdin.
Original:
The global objects std::cin and std::wcin control input from a stream buffer of implementation-defined type (derived from std::streambuf), associated with the standard C input stream stdin.
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Esses objetos são garantidos para ser construído antes de o primeiro construtor de um objeto estático é chamado e eles são garantidos para sobreviver à última destruidor de um objeto estático, de modo que é sempre possível ler de std::cin no código do usuário.
Original:
These objects are guaranteed to be constructed before the first constructor of a static object is called and they are guaranteed to outlive the last destructor of a static object, so that it is always possible to read from std::cin in user code.
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A menos que sync_with_stdio(false) foi emitido, ele é seguro para acessar simultaneamente esses objetos de vários segmentos para entrada formatado e não formatado.
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Unless sync_with_stdio(false) has been issued, it is safe to concurrently access these objects from multiple threads for both formatted and unformatted input.
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Uma vez std::cin é construído, std::cin.tie() retornos &std::cout e, também, std::wcin.tie() retornos &std::wcout. Isso significa que qualquer operação de entrada formatada em std::cin força uma chamada para std::cout.flush() se quaisquer caracteres estão pendentes para a saída.
Original:
Once std::cin is constructed, std::cin.tie() returns &std::cout, and likewise, std::wcin.tie() returns &std::wcout. This means that any formatted input operation on std::cin forces a call to std::cout.flush() if any characters are pending for output.
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[editar] Exemplo

#include <iostream>
struct Foo {
    int n;
    Foo() {
       std::cout << "Enter n: "; // no flush needed
       std::cin >> n;
    }
};
Foo f; // static object
int main()
{
    std::cout << "f.n is " << f.n << '\n';
}

Saída: 

Enter n: 10
f.n is 10

[editar] Veja também
inicializa objetos de fluxo padrão
Original:
initializes standard stream objects
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(of std::ios_base public class membro) [edit]
grava o padrão de fluxo de saída stdout
(objeto global) C
Original:
writes to the standard C output stream stdout
(objeto global)
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[edit]
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