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std::basic_stringbuf::setbuf

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< cpp‎ | io‎ | basic stringbuf

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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_stringbuf
Funzioni membro pubbliche
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
Protetto funzioni membro
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
Non membri funzioni
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 )
Se s è un puntatore nullo e n è pari a zero, questa funzione non ha alcun effetto.
Original:
If s is a null pointer and n is zero, this function has no effect.
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In caso contrario, l'effetto è definito dall'implementazione: alcune implementazioni non fare nulla, mentre alcune implementazioni cancellare il membro std::string attualmente utilizzata come buffer e iniziare a utilizzare il fornito dall'utente array di caratteri di n dimensioni, il cui primo elemento è puntato da s, come il buffer e l'ingresso / uscita sequenza di caratteri.
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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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_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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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

Il deprecato std::strstreambuf buffer del flusso o il dispositivo boost.IOStreams boost::basic_array può essere utilizzato per implementare I / O buffer su un fornito dall'utente array di caratteri in modo portabile.
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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[modifica] Esempio

Test per la funzionalità del setbuf stringstream di
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++)

[modifica] Vedi anche
Invoca setbuf()
Original:
invokes setbuf()
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(metodo pubblico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/basic_stringbuf/setbuf&oldid=25750"