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std::basic_stringbuf::setbuf

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< cpp‎ | io‎ | basic stringbuf

 
 
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_stringbuf
Las funciones públicas miembros
Original:
Public member functions
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basic_stringbuf::basic_stringbuf
basic_stringbuf::operator=(C++11)
basic_stringbuf::swap(C++11)
basic_stringbuf::str
Protegido funciones miembro
Original:
Protected member functions
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basic_stringbuf::underflow
basic_stringbuf::pbackfail
basic_stringbuf::overflow
basic_stringbuf::setbuf
basic_stringbuf::seekoff
basic_stringbuf::seekpos
Terceros funciones
Original:
Non-member functions
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swap(std::basic_stringbuf)(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, esta función no tiene efecto .
Original:
If s is a null pointer and n is zero, this function has no effect.
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De lo contrario, el efecto es definido por la implementación: algunas implementaciones no hacer nada, mientras que algunas implementaciones borre el miembro std::string utiliza actualmente como el tampón y comenzar a utilizar la matriz de caracteres suministrada por el usuario de n tamaño, cuyo primer elemento es apuntado por s, como la tampón y la secuencia de caracteres de entrada / salida .
Original:
Otherwise, the effect is implementation-defined: some implementations do nothing, while some implementations clear the std::string member currently used as the buffer and begin using the user-supplied character array of size n, whose first element is pointed to by s, as the buffer and the input/output character sequence.
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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_stringbuf .
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_stringbuf.
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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

La corriente std::strstreambuf tampón obsoleta o la boost::basic_array boost.IOStreams dispositivo puede ser usado para implementar E / S a través de un tampón proporcionado por el usuario matriz de caracteres en forma portátil .
Original:
The deprecated stream buffer std::strstreambuf or the boost.IOStreams device boost::basic_array may be used to implement I/O buffering over a user-provided char array in portable manner.
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[editar] Ejemplo

Prueba para la funcionalidad de la setbuf stringstream de
Original:
Test for the stringstream's setbuf functionality
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#include <iostream>
#include <sstream>
int main()
{
    std::ostringstream ss;
    char c[1024] = {};
    ss.rdbuf()->pubsetbuf(c, 1024);
    ss << 3.14 << '\n';
    std::cout << c << '\n';
}

Output:

3.14 (on GNU g++/libstdc++ and SunPro C++/roguewave)
<nothing> (on MS Visual Studio 2010, SunPro C++/stlport4, CLang++/libc++)

[editar] Ver también

Invoca setbuf()
Original:
invokes setbuf()
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(miembro público of std::basic_streambuf función) [edit]