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std::basic_filebuf::setbuf

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< cpp‎ | io‎ | basic filebuf

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C++
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
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
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Funzioni membro pubbliche
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
Protetto funzioni membro
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
Non membri funzioni
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 )
Se s è un puntatore nullo e n è pari a zero, il filebuf diventa' senza buffer per l'output, significato e pbase() pptr() sono nulli ed ogni uscita viene immediatamente inviato al file.
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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In caso contrario, una chiamata al setbuf() sostituisce l'interno buffer (la sequenza di caratteri controllata) con l'utente fornita array di caratteri il cui primo elemento è puntato da s e permette questo oggetto std::basic_filebuf di utilizzare fino al byte n in tale matrice per il buffering.
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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Questa funzione è protetta virtuale, può essere chiamato solo tramite pubsetbuf() o da funzioni membro di una classe definita dall'utente derivata da 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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Indice

[modifica] Parametri

s -
puntatore al primo byte nel buffer fornito dall'utente o null
Original:
pointer to the first byte in the user-provided buffer or null
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n -
il numero di byte nel buffer fornito dall'utente o zero
Original:
the number of bytes in the user-provided buffer or zero
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[modifica] Valore di ritorno

*this, lanciato alla classe base std::basic_streambuf.
Original:
*this, cast to the base class std::basic_streambuf.
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[modifica] Note

Le condizioni in cui questa funzione può essere utilizzata e il modo in cui viene utilizzato il buffer fornito è definito dall'implementazione.
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() può essere chiamato solo quando il std::basic_filebuf non è associato a un file (non influisce altrimenti). Con fornito dall'utente buffer, lettura da file legge n-1 byte alla volta.
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() può essere chiamato dopo l'apertura del file, ma prima di qualsiasi I / O (potrebbe bloccarsi in caso contrario). Con un fornito dall'utente tampone , la lettura da file legge più grandi multipli di 4096 che si adattano nel buffer.
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() può essere chiamato in qualsiasi momento, anche a distanza di I / O ha avuto luogo. contenuto corrente del buffer, se del caso, si perdono.
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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La norma non definisce alcun comportamento di questa funzione, tranne che setbuf(0, 0) chiamato prima di qualsiasi I / O ha avuto luogo è necessario per impostare l'uscita senza buffer.
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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[modifica] Esempio

fornire un buffer 10k per la lettura. Su Linux, il programma di utilità strace può essere utilizzato per osservare il numero effettivo di byte letti
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';
}


[modifica] Vedi anche
Invoca setbuf()
Original:
invokes setbuf()
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(metodo pubblico) [modifica]
imposta il buffer e la dimensione di un flusso di file
Original:
sets the buffer and its size for a file stream
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(funzione) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/basic_filebuf/setbuf&oldid=25618"