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std::basic_filebuf::setbuf

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< cpp‎ | io‎ | basic filebuf

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
Original:
Streams
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Abstracciones
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cadena de I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
Original:
Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Error interfaz categoría
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Las funciones públicas miembros
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator=(C++11)
basic_filebuf::swap(C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
Protegido funciones miembro
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
Terceros funciones
Original:
Non-member functions
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swap(std::basic_filebuf)(C++11)
 
protected:
virtual std::basic_streambuf<CharT, Traits>* setbuf( char_type* s, std::streamsize n )
Si s es un puntero nulo y n es cero, se convierte en el filebuf' sin memoria intermedia para la salida, es decir pbase() y pptr() son nulos y cualquier salida inmediatamente se envía al archivo .
Original:
If s is a null pointer and n is zero, the filebuf becomes unbuffered for output, meaning pbase() and pptr() are null and any output is immediately sent to file.
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De lo contrario, una llamada a setbuf() sustituye a la interna buffer (la secuencia de caracteres de control) con la matriz de caracteres proporcionada por el usuario cuyo primer elemento es apuntado por s y permite que este objeto std::basic_filebuf utilizar hasta n bytes de la matriz de almacenamiento en búfer .
Original:
Otherwise, a call to setbuf() replaces the internal buffer (the controlled character sequence) with the user-supplied character array whose first element is pointed to by s and allows this std::basic_filebuf object to use up to n bytes in that array for buffering.
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Esta función está protegida virtual, que sólo puede ser llamado a través de pubsetbuf() o de funciones miembro de una clase definida por el usuario derivados de std::basic_filebuf .
Original:
This function is protected virtual, it may only be called through pubsetbuf() or from member functions of a user-defined class derived from std::basic_filebuf.
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Contenido

[editar] Parámetros

s -
puntero al primer byte en la memoria intermedia proporcionado por el usuario o nulo
Original:
pointer to the first byte in the user-provided buffer or null
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n -
el número de bytes en el búfer proporcionado por el usuario o cero
Original:
the number of bytes in the user-provided buffer or zero
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[editar] Valor de retorno

*this, arrojado a la clase base std::basic_streambuf .
Original:
*this, cast to the base class std::basic_streambuf.
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[editar] Notas

Las condiciones en las que esta función se puede utilizar y la forma en que se utiliza el búfer proporcionado es definido por la implantación .
Original:
The conditions when this function may be used and the way in which the provided buffer is used is implementation-defined.
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  • GCC 4.6 libstdc + +
    Original:
    GCC 4.6 libstdc++
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setbuf() sólo puede ser llamada cuando el std::basic_filebuf no está asociado con un archivo (no tiene ningún efecto contrario). Con proporcionado por el usuario buffer, al leer el archivo lee n-1 bytes a la vez .
Original:
setbuf() may only be called when the std::basic_filebuf is not associated with a file (has no effect otherwise). With a user-provided buffer, reading from file reads n-1 bytes at a time.
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  • Clang + 3,0 libc + +
    Original:
    Clang++3.0 libc++
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setbuf() puede ser llamado una vez abierto el archivo, pero antes de I / O (se puede bloquear de otra manera). Con el buffer proporcionado por el usuario , la lectura de archivos lee más grandes múltiplos de 4096 que caben en el búfer .
Original:
setbuf() may be called after opening the file, but before any I/O (may crash otherwise). With a user-provided buffer, reading from file reads largest multiples of 4096 that fit in the buffer.
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  • Visual Studio 2010
    Original:
    Visual Studio 2010
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setbuf() se puede llamar en cualquier momento, incluso después de un I / O se llevó a cabo. contenido actual del buffer, en su caso, se pierden .
Original:
setbuf() may be called at any time, even after some I/O took place. Current contents of the buffer, if any, are lost.
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El estándar no define el comportamiento de esta función, excepto que setbuf(0, 0) llamado antes que cualquier E / S se ha llevado a cabo se requiere para establecer la salida sin búfer .
Original:
The standard does not define any behavior for this function except that setbuf(0, 0) called before any I/O has taken place is required to set unbuffered output.
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[editar] Ejemplo

proporcionar un tampón de 10k para la lectura. En Linux, la utilidad strace puede ser utilizado para observar el número real de bytes leídos
Original:
provide a 10k buffer for reading. On linux, the strace utility may be used to observe the actual number of bytes read
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#include <fstream>
#include <iostream>
#include <string>
int main()
{
        int cnt=0;
        std::ifstream file;
        char buf[10241];
        file.rdbuf()->pubsetbuf(buf, sizeof buf);
        file.open("/usr/share/dict/words");
        for(std::string line; getline(file, line); )
                cnt++;
        std::cout << cnt << '\n';
}


[editar] Ver también

Invoca setbuf()
Original:
invokes setbuf()
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(miembro público of std::basic_streambuf función) [edit]
establece el tampón y su tamaño para una secuencia de archivo
Original:
sets the buffer and its size for a file stream
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(función) [edit]