std::basic_istream::sync
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int sync(); |
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Sincroniza el buffer de entrada con la fuente de datos asociada .
Original:
Synchronizes the input buffer with the associated data source.
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Se comporta como
UnformattedInputFunction, excepto que gcount() no se ve afectada. Después de la construcción y comprobación del objeto centinelaOriginal:
Behaves as
UnformattedInputFunction, except that gcount() is not affected. After constructing and checking the sentry object,The text has been machine-translated via Google Translate.
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si rdbuf() es un puntero NULL, devuelve
-1Original:
if rdbuf() is a null pointer, returns
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De lo contrario, las llamadas
rdbuf()->pubsync(). Si la función devuelve -1, llama setstate(badbit) y vuelve -1. De lo contrario, devuelve 0 .Original:
Otherwise, calls
rdbuf()->pubsync(). If that function returns -1, calls setstate(badbit) and returns -1. Otherwise, returns 0.The text has been machine-translated via Google Translate.
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Parámetros
(Ninguno)
Original:
(none)
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Valor de retorno
0 en caso de éxito, -1 en caso de fallo o si la secuencia no admite esta operación (es unbuffered) .Original:
0 on success, -1 on failure or if the stream does not support this operation (is unbuffered).The text has been machine-translated via Google Translate.
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Notas
Al igual que con
readsome(), es definido por la implantación si esta función no hace nada con suministrados biblioteca arroyos. La intención es normalmente para leer la siguiente operación para recoger las modificaciones que se han realizado en la secuencia de entrada correspondiente después de la última memoria de flujo lleno obtener su área. Para lograrlo, sincronizar () puede vaciar la zona get, o puede rellenarlo, o puede no hacer nada. Una excepción notable es Visual Studio, donde esta operación descarta la entrada sin procesar cuando se llama con un flujo de entrada estándar .Original:
As with
readsome(), it is implementation-defined whether this function does anything with library-supplied streams. The intent is typically for the next read operation to pick up any changes that may have been made to the associated input sequence after the stream buffer last filled its get area. To achieve that, sync() may empty the get area, or it may refill it, or it may do nothing. A notable exception is Visual Studio, where this operation discards the unprocessed input when called with a standard input stream.The text has been machine-translated via Google Translate.
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Ejemplo
Muestra el uso de corriente de entrada de sincronización () con el archivo de entrada, tal como se aplica en algunas plataformas .
Original:
Demonstrates the use of input stream sync() with file input, as implemented on some platforms.
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Ejecuta este código
#include <iostream>
#include <fstream>
void file_abc()
{
std::ofstream f("test.txt");
f << "abc\n";
}
void file_123()
{
std::ofstream f("test.txt");
f << "123\n";
}
int main()
{
file_abc(); // file now contains "abc"
std::ifstream f("test.txt");
std::cout << "Reading from the file\n";
char c;
f >> c; std::cout << c;
file_123(); // file now contains "123"
f >> c; std::cout << c;
f >> c; std::cout << c << '\n';
f.close();
file_abc(); // file now contains "abc"
f.open("test.txt");
std::cout << "Reading from the file, with sync()\n";
f >> c; std::cout << c;
file_123(); // file now contains "123"
f.sync();
f >> c; std::cout << c;
f >> c; std::cout << c << '\n';
}
Posible salida:
Reading from the file
abc
Reading from the file, with sync()
a23
Ver también
[virtual] |
Sincroniza los búferes con la secuencia de caracteres asociada. (función miembro virtual protegida de std::basic_streambuf<CharT,Traits>)
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(función miembro pública de std::basic_ostream<CharT,Traits>)
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