std::basic_ios::bad — cppreference.com

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• L'insertion dans le flux de sortie par put () ou write () échoue pour une raison quelconque .

  Original:

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

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• L'insertion dans le flux de sortie par << opérateur, std::put_money ou std::put_time, n'a pas pu terminer parce que la fin du flux de sortie a été atteint (fonction La facette de formatage de sortie tels que

  num_put::put()

  ou

  money_put::put()

  , retourne un itérateur iter tels que iter.failed()==true)

  Original:

  Insertion into the output stream by << opérateur, 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 est construit avec un pointeur NULL pour rdbuf (), ou putback () / unget () est appelée sur un ruisseau avec un rdbuf nulle (), ou un pointeur NULL passé à l'opérateur << (* basic_streambuf)

  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 () ou rdbuf () -> sungetc () de retour traits :: eof () à putback () ou unget ()

  Original:

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

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• rdbuf () -> pubsync () retourne -1 pour synchroniser (), pour flush (), ou le destructeur de ostream :: sentinelle sur un flux unitbuf

  Original:

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

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• Exception est levée au cours d'une opération d'E / S par une fonction membre de la mémoire tampon de flux associé (par exemple sbumpc (), xsputn (), sgetc (), de trop-plein (), 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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• Exception est levée dans iword () ou motpasse () (par exemple std :: bad_alloc)

  Original:

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

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Paramètres

Retourne la valeur

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";
}

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