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std::basic_ios::eof

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< cpp‎ | io‎ | basic ios

 
 
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
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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
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Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_ios
Membri funzioni
Original:
Member functions
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basic_ios::basic_ios
basic_ios::~basic_ios
Le funzioni dello Stato
Original:
State functions
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basic_ios::good
basic_ios::eof
basic_ios::fail
basic_ios::bad
basic_ios::operator!
basic_ios::operator bool
basic_ios::rdstate
basic_ios::setstate
basic_ios::clear
Formattazione
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Formatting
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basic_ios::copyfmt
basic_ios::fill
Varie
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Miscellaneous
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basic_ios::exceptions
basic_ios::imbue
basic_ios::rdbuf
basic_ios::tie
basic_ios::narrow
basic_ios::widen
Protetto funzioni membro
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Protected member functions
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basic_ios::init
basic_ios::move
basic_ios::swap
basic_ios::set_rdbuf
 
bool eof() const;
Restituisce true se il flusso associato ha raggiunto la fine del file. In particolare, se restituisce true eofbit si trova in rdstate().
Original:
Returns true if the associated stream has reached end-of-file. Specifically, returns true if eofbit is set in rdstate().
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Indice

[modifica] Parametri

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

true se un end-of-file si è verificato, false altrimenti.
Original:
true if an end-of-file has occurred, false otherwise.
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[modifica] Note

Questa funzione riporta solo lo stato corrente come stabilito dalla più recente di I / O, non esamina l'origine dati associata. Ad esempio, se il più recente I / O è un get(), che restituito l'ultimo byte del file, restituisce eof() false. Il get() prossimo non riesce a leggere nulla e imposta il eofbit. Solo allora eof() torna true.
Original:
This function only reports the stream state as set by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a get(), which returned the last byte of a file, eof() returns false. The next get() fails to read anything and sets the eofbit. Only then eof() returns true.
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Nell'uso tipico, trattamento di flussi di input si ferma in caso di errori, eof() e fail() vengono poi utilizzati per distinguere tra diverse condizioni di errore.
Original:
In typical usage, input stream processing stops on any error; eof() and fail() are then used to distinguish between different error conditions.
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[modifica] Esempio

[edit]
#include <iostream>
#include <fstream>
#include <cstdlib>
int main()
{
    std::ifstream file("test.txt");
    if(!file)  // operator! is used here
    {  
        std::cout << "File opening failed\n";
        return EXIT_FAILURE;
    }
 
    // typical C++ I/O loop uses the return value of the I/O function
    // as the loop controlling condition, operator bool() is used here
    for(int n; file >> n; ) {
       std::cout << n << ' ';
    }
    std::cout << '\n';
 
    if (file.bad())
        std::cout << "I/O error while reading\n";
    else if (file.eof())
        std::cout << "End of file reached successfully\n";
    else if (file.fail())
        std::cout << "Non-integer data encountered\n";
}


[modifica] Vedi anche

ios_base::iostate flags basic_ios accessors
eofbit failbit badbit good() fail() bad() eof() operator bool() operator!()
false false false true false false false true false
false false true false true true false false true
false true false false true false false false true
false true true false true true false false true
true false false false false false true true false
true false true false true true true false true
true true false false true false true false true
true true true false true true true false true
controlli per la fine del file
Original:
checks for the end-of-file
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(funzione) [edit]