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std::basic_ios::fail

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< cpp‎ | io‎ | basic ios

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_ios
Membri funzioni
Original:
Member functions
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basic_ios::basic_ios
basic_ios::~basic_ios
Le funzioni dello Stato
Original:
State functions
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basic_ios::good
basic_ios::eof
basic_ios::fail
basic_ios::bad
basic_ios::operator!
basic_ios::operator bool
basic_ios::rdstate
basic_ios::setstate
basic_ios::clear
Formattazione
Original:
Formatting
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basic_ios::copyfmt
basic_ios::fill
Varie
Original:
Miscellaneous
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basic_ios::exceptions
basic_ios::imbue
basic_ios::rdbuf
basic_ios::tie
basic_ios::narrow
basic_ios::widen
Protetto funzioni membro
Original:
Protected member functions
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basic_ios::init
basic_ios::move
basic_ios::swap
basic_ios::set_rdbuf
 
bool fail() const;
Restituisce true se è verificato un errore sul flusso associata. In particolare, se restituisce true badbit o failbit si trova in rdstate().
Original:
Returns true if an error has occurred on the associated stream. Specifically, returns true if badbit or failbit is set in rdstate().
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

true se si verifica un errore, altrimenti false.
Original:
true if an error has occurred, false otherwise.
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[modifica] Esempio

[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";
}


[modifica] Vedi anche

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
assegni per un errore di file
Original:
checks for a file error
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(funzione) [edit]