std::basic_ios::eof
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<metanoindex/>
<tbody> </tbody> bool eof() const; |
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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().The text has been machine-translated via Google Translate.
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Paramètres
(Aucun)
Original:
(none)
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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.The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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Exemple
#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";
}
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |