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std::basic_ios::bad – cppreference.com

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Versandkosten true wenn nicht behebbarer Fehler ist auf der zugehörigen Stream aufgetreten. Insbesondere kehrt true wenn badbit in rdstate() gesetzt .

Original:

Returns true if non-recoverable error has occurred on the associated stream. Specifically, returns true if badbit is set in rdstate().

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Die Standard-Bibliothek setzt BadBit in den folgenden Situationen:

Original:

The standard library sets badbit in the following situations:

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  • Einsetzen in den Ausgabe-Stream von put () oder write () aus irgendeinem Grund ausfällt .

    Original:

    Insertion into the output stream by put() or write() fails for any reason.

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  • Einsetzen in den Ausgabe-Stream von operator <<, std::put_money oder std::put_time, konnte nicht abgeschlossen werden, da das Ende der Ausgabe-Stream erreicht wurde (die Facette der Formatierung ausgegeben Funktion wie

    num_put::put()

    oder

    money_put::put()

    , liefert einen Iterator iter so dass iter.failed()==true)

    Original:

    Insertion into the output stream by operator <<, std::put_money or std::put_time, could not complete because the end of the output stream was reached (The facet's formatting output function such as

    num_put::put()

    or

    money_put::put()

    , returns an iterator iter such that iter.failed()==true)

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  • Stream ist mit einem Null-Zeiger für RDBUF () konstruiert oder putback () / unget () wird auf einen Strom mit einer null RDBUF () oder eine Null-Zeiger übergeben operator << (basic_streambuf *) genannt

    Original:

    Stream is constructed with a null pointer for rdbuf(), or putback()/unget() is called on a stream with a null rdbuf(), or a null pointer passed to operator<<(basic_streambuf*)

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  • RDBUF () -> sputbackc () oder RDBUF () -> sungetc () return Eigenschaften :: eof (), um putback () oder unget ()

    Original:

    rdbuf()->sputbackc() or rdbuf()->sungetc() return traits::eof() to putback() or unget()

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  • RDBUF () -> pubsync () gibt -1 zu synchronisieren (), um flush (), oder an den Destruktor ostream :: sentry auf einem unitbuf Stream

    Original:

    rdbuf()->pubsync() returns -1 to sync(), to flush(), or to the destructor of ostream::sentry on a unitbuf stream

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  • Ausnahme wird während einer I / O-Operation von jedem Mitglied Funktion der zugehörigen Strompuffers geworfen (zB sbumpc (), xsputn (), sgetc (), overflow (), etc)

    Original:

    Exception is thrown during an I/O operation by any member function of the associated stream buffer (e.g. sbumpc(), xsputn(), sgetc(), overflow(), etc)

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  • Ausnahme ist in iword () oder PWord (geworfen) (zB std :: bad_alloc)

    Original:

    Exception is thrown in iword() or pword() (e.g. std::bad_alloc)

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Parameter

(None)

Original:

(none)

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Rückgabewert

true wenn ein nicht behebbarer Fehler aufgetreten ist, false sonst .

Original:

true if a non-recoverable error has occurred, false otherwise.

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Beispiel

[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";
}

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