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std::basic_ios::eof

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< cpp‎ | io‎ | basic ios

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
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Streams
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Abstractions
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
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Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
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Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::basic_ios
Les fonctions membres
Original:
Member functions
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basic_ios::basic_ios
basic_ios::~basic_ios
Fonctions de l'État
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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
Mise en forme
Original:
Formatting
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basic_ios::copyfmt
basic_ios::fill
Divers
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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
Protégé fonctions membres
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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;
Retours true si le flux associé a atteint la fin du fichier. Plus précisément, les rendements true si eofbit est situé dans 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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Sommaire

[modifier] Paramètres

(Aucun)
Original:
(none)
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[modifier] Retourne la valeur

true si une fin-de-fichier s'est produite, false autrement .
Original:
true if an end-of-file has occurred, false otherwise.
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[modifier] Notes

Cette fonction signale que l'état courant tel que défini par la plus récente opération E / S, il n'examine pas la source de données associée. Par exemple, si la plus récente d'E / S a été un get(), qui a retourné le dernier octet d'un fichier, eof() retours false. La prochaine get() ne parvient pas à lire quoi que ce soit et définit la eofbit. C'est alors seulement eof() retours 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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En utilisation normale, le traitement des flux d'entrée s'arrête sur une erreur; eof() et fail() sont ensuite utilisés pour distinguer entre les différentes conditions d'erreur .
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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[modifier] Exemple

[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";
}


[modifier] Voir aussi

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
contrôle de la fin de fichier
Original:
checks for the end-of-file
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(fonction) [edit]