Espacios de nombres
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std::cin, std::wcin

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< cpp‎ | io

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
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Streams
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Abstracciones
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cadena de I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
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Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
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Types
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streamoff
streamsize
fpos
Error interfaz categoría
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Los objetos globales
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Global objects
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cin
wcin
Las funciones miembro
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada con formato
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Formatted input
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basic_istream::operator>>
Entrada sin formato
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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
Posicionamiento
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Positioning
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basic_istream::tellg
basic_istream::seekg
Varios
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Clases de miembros
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Member classes
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basic_istream::sentry
Terceros funciones
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Non-member functions
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operator>>(std::basic_istream)
 
Defined in header <iostream>
extern std::istream cin;
(1)
extern std::wistream wcin;
(2)
Los objetos globales std::cin y std::wcin entrada de control de un búfer de la secuencia de aplicación definido por el tipo (derivado de std::streambuf), asociada con el flujo de entrada estándar 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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Estos objetos están garantizados para ser construido antes de la primera constructor de un objeto estático se llama y que están garantizados para sobrevivir a la última destructor de un objeto estático, por lo que siempre es posible leer desde std::cin en código de usuario .
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) se ha emitido, se puede acceder a estos objetos simultáneamente desde varios subprocesos, tanto de entrada con formato y sin formato .
Original:
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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Una vez construidas, se std::cin std::cin.tie() vuelve &std::cout, y además, std::wcin.tie() vuelve &std::wcout. Esto significa que cualquier operación de entrada con formato en std::cin fuerza una llamada a std::cout.flush() si los caracteres están pendientes para la salida .
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] Ejemplo

#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';
}

Output:

Enter n: 10
f.n is 10

[editar] Ver también

inicializa los objetos estándar de la corriente
Original:
initializes standard stream objects
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(miembro público of std::ios_base clase) [edit]
escribe en el stdout
(objeto global) corriente estándar C de salida
Original:
writes to the standard C output stream stdout
(objeto global)
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[edit]