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std::basic_ios::eof — cppreference.com

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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().

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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.

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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.

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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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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) [edit]