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std::basic_ios::eof – cppreference.com

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Versandkosten true, wenn die zugehörige Stream hat end-of-Datei erreicht. Insbesondere kehrt true wenn eofbit in rdstate() gesetzt .

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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Parameter

(None)

Original:

(none)

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Rückgabewert

true wenn ein Ende-der-Datei aufgetreten ist, ansonsten false .

Original:

true if an end-of-file has occurred, false otherwise.

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Notes

Diese Funktion meldet nur den Strom Staat als von der jüngsten I / O Betrieb eingestellt, ist es nicht untersuchen die zugeordneten Datenquellen. Zum Beispiel, wenn der jüngsten I / O war ein get(), die das letzte Byte einer Datei, eof() kehrt false zurückgegeben. Der nächste get() nicht etwas zu lesen und stellt die eofbit. Erst dann eof() kehrt 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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In der typischen Anwendung, stoppt Input Stream Processing bei jedem Fehler; eof() und fail() werden dann verwendet, um zwischen verschiedenen Fehlerbedingungen unterscheiden .

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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Beispiel

#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";
}

Siehe auch

`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


	Prüfungen für die End-of-Datei 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. (Funktion) [edit]