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std::basic_filebuf::showmanyc

Da cppreference.com.
< cpp‎ | io‎ | basic filebuf

 
 
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::streamsize showmanyc()
Se attuata, restituisce il numero di caratteri a sinistra per leggere dal file.
Original:
If implemented, returns the number of characters left to read from the file.
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

Il numero di caratteri disponibili per la lettura dal file, o -1 se il fine del file è stato raggiunto.
Original:
The number of characters available for reading from the file, or -1 if the end of file was reached.
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[modifica] Note

Questa funzione è opzionale. Se non implementato, questa funzione restituisce 0 (poiché la classe std::basic_streambuf::showmanyc versione base viene chiamato)
Original:
This function is optional. If not implemented, this function returns 0 (since the base class version std::basic_streambuf::showmanyc gets called)
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Che sia implementata o no, questa funzione è normalmente chiamato dal std::basic_streambuf::in_avail se l'area get è vuoto.
Original:
Whether implemented or not, this function is normally called by std::basic_streambuf::in_avail if the get area is empty.
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[modifica] Esempio

Il test di implementazione per vedere se showmanyc () è implementato per filebuf
Original:
implementation test to see if showmanyc() is implemented for filebuf
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#include <fstream>
#include <iostream>
 
struct mybuf : std::filebuf
{
     using std::filebuf::showmanyc;
};
 
int main()
{
    mybuf fin;
    fin.open("test.in", std::ios_base::in);
    std::cout << "showmanyc() returns " << fin.showmanyc() << '\n';
}

Output:

showmanyc() returns 6626

[modifica] Vedi anche

ottiene il numero di caratteri immediatamente disponibili nella zona get
Original:
obtains the number of characters immediately available in the get area
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(membro pubblico of std::basic_streambuf funzione) [edit]
estrae blocchi già disponibili di caratteri
Original:
extracts already available blocks of characters
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(membro pubblico of std::basic_istream funzione) [edit]