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std::basic_streambuf<CharT,Traits>::pubsetbuf, std::basic_streambuf<CharT,Traits>::setbuf

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< cpp‎ | io‎ | basic streambuf
 
 
 
std::basic_streambuf
Las funciones públicas miembros
Original:
Public member functions
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Locales
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Locales
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Posicionamiento
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Positioning
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basic_streambuf::pubsetbuf
Obtenga zona
Original:
Get area
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Ponga zona
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Put area
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Dos puntos
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Putback
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Protegido funciones miembro
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Protected member functions
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Locales
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Locales
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Posicionamiento
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Positioning
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basic_streambuf::setbuf
Obtenga zona
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Get area
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Ponga zona
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Put area
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Dos puntos
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Putback
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basic_streambuf<CharT,Traits>* pubsetbuf( char_type* s, std::streamsize n )
(1)
protected:
virtual basic_streambuf<CharT,Traits>* setbuf( char_type* s, std::streamsize n )
(2)
1)
Llamadas setbuf(s, n) de la clase más derivada
Original:
Calls setbuf(s, n) of the most derived class
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2)
La versión de la clase base de esta función no tiene ningún efecto. Las clases derivadas pueden anular esta función para permitir la remoción o reemplazo de la secuencia de caracteres de control (el buffer) con una matriz proporcionada por el usuario, o para cualquier otro propósito específico de la implementación .
Original:
The base class version of this function has no effect. The derived classes may override this function to allow removal or replacement of the controlled character sequence (the buffer) with a user-provided array, or for any other implementation-specific purpose.
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Contenido

[editar]Parámetros

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

*this

[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

[virtual]
proporciona suministrado por el usuario búfer o sin búfer convierte a esta filebuf
Original:
provides user-supplied buffer or turns this filebuf unbuffered
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(función miembro virtual protegida de std::basic_filebuf)[editar]
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