std::basic_filebuf::showmanyc

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecato)

Streams Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Astrazioni Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

String I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Array I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Errore categoria interfaccia Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

std::basic_filebuf

Funzioni membro pubbliche Original: Public member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap(std::basic_filebuf) (C++11)

 

protected: virtualstd::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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Parametri

(Nessuno)

Original:

(none)

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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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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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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

Vedi anche

in_avail	ottiene il numero di caratteri immediatamente disponibili nella zona get Original: obtains the number of characters immediately available in the get area The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
readsome	estrae blocchi già disponibili di caratteri Original: extracts already available blocks of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)