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std::basic_ios::bad

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< cpp‎ | io‎ | basic ios

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
Streams
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Abstrações
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
Cordas I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Interface de categoria de erro
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_ios
Funções de membro
Original:
Member functions
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basic_ios::basic_ios
basic_ios::~basic_ios
Funções do Estado
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
Formatação
Original:
Formatting
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basic_ios::copyfmt
basic_ios::fill
Diversos
Original:
Miscellaneous
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basic_ios::exceptions
basic_ios::imbue
basic_ios::rdbuf
basic_ios::tie
basic_ios::narrow
basic_ios::widen
Protegido funções de membro
Original:
Protected member functions
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basic_ios::init
basic_ios::move
basic_ios::swap
basic_ios::set_rdbuf
 
bool bad() const;
Retorna true se não recuperável Erro no fluxo associado. Especificamente, os retornos true se badbit é definido em rdstate().
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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A biblioteca padrão define badbit nas seguintes situações:
Original:
The standard library sets badbit in the following situations:
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  • Inserção no fluxo de saída por colocar () ou write () falhar por qualquer motivo.
    Original:
    Insertion into the output stream by put() or write() fails for any reason.
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  • Inserção no fluxo de saída por operador. <<, std::put_money ou std::put_time, não foi possível concluir, porque o final do fluxo de saída foi alcançado (função A faceta de saída de formatação como num_put::put() ou money_put::put(), devolve uma iteração tal que iter iter.failed()==true)
    Original:
    Insertion into the output stream by operador. <<, 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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  • Fluxo é construído com um ponteiro nulo para rdbuf (), ou putback () / unget () é chamado em um riacho com um rdbuf nula (), ou um ponteiro nulo passado para operador << (* 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 () - Retorna> sungetc () traços :: EOF () para putback () ou unget ()
    Original:
    rdbuf()->sputbackc() or rdbuf()->sungetc() return traits::eof() to putback() or unget()
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  • rdbuf () -> pubsync () retorna -1 para sincronizar (), para flush (), ou o destruidor de ostream :: sentinela em um córrego 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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  • Exceção é lançada durante uma operação de I / O por qualquer função de membro do buffer de fluxo associado (por exemplo 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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  • Exceção é lançada em iword () ou pword () (por exemplo, std :: bad_alloc)
    Original:
    Exception is thrown in iword() or pword() (e.g. std::bad_alloc)
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Índice

[editar] Parâmetros

(Nenhum)
Original:
(none)
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[editar] Valor de retorno

true se um erro não-recuperável ocorreu, false outra forma.
Original:
true if a non-recoverable error has occurred, false otherwise.
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[editar] Exemplo

[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";
}


[editar] Veja também

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