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std::ios_base::iostate

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< cpp‎ | io‎ | ios base

 
 
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
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Streams
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Abstrações
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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
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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
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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::ios_base
Funções de membro
Original:
Member functions
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ios_base::ios_base
ios_base::~ios_base
Formatação
Original:
Formatting
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ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
Localidades
Original:
Locales
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ios_base::imbue
ios_base::getloc
Matriz extensível interno
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Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
Diversos
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Miscellaneous
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ios_base::register_callback
ios_base::sync_with_stdio
Aulas-Membros
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Member classes
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ios_base::failure
ios_base::Init
Tipos de membro
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Member types
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ios_base::openmode
ios_base::fmtflags
ios_base::iostate
ios_base::seekdir
ios_base::event
ios_base::event_callback
 
typedef /*implementation defined*/ iostate;
static constexpr iostate goodbit = 0;
static constexpr iostate badbit = /*implementation defined*/

static constexpr iostate failbit = /*implementation defined*/

static constexpr iostate eofbit = /*implementation defined*/
Especifica os sinalizadores de estado de fluxo. É um BitmaskType, as seguintes constantes são definidas:
Original:
Specifies stream state flags. It is a BitmaskType, the following constants are defined:
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Constante
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Constant
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Explanation
goodbit
nenhum erro
Original:
no error
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badbit
erro de fluxo de irrecuperável
Original:
irrecoverable stream error
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failbit
entrada / saída de operação falhou (formatação ou erro de extração)
Original:
input/output operation failed (formatting or extraction error)
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eofbit
seqüência de entrada associado atingiu o fim-de-arquivo
Original:
associated input sequence has reached end-of-file
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Índice

[editar] O eofbit

O eofbit é definido pelos seguintes funções da biblioteca padrão:
Original:
The eofbit is set by the following standard library functions:
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  • A seqüência de std::getline função de entrada se completa ao atingir o final do fluxo, em vez de alcançar o caractere especificado terminando.
    Original:
    The string input function std::getline if it completes by reaching the end of the stream, as opposed to reaching the specified terminating character.
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  • As sobrecargas de entrada numéricos de basic_istream::operator>> se o fim do fluxo foi encontrado ao ler o caractere seguinte, em 2 ª fase de processamento num_get::get. Dependendo do estado a análise, failbit pode ou não pode ser definida ao mesmo tempo: por exemplo, os conjuntos int n; istringstream buf("1"); buf >> n; eofbit, mas não failbit: a 1 inteiro foi analisado com êxito e armazenadas em n. Por outro lado, bool b; istringstream buf("tr"); buf >> boolalpha >> b; define tanto eofbit e failbit: não havia caracteres suficientes para completar a análise do true boolean.
    Original:
    The numeric input overloads of basic_istream::operator>> if the end of the stream was encountered while reading the next character, on Stage 2 of num_get::get processing. Depending on the parsing state, failbit may or may not be set at the same time: for example, int n; istringstream buf("1"); buf >> n; sets eofbit, but not failbit: the integer 1 was successfully parsed and stored in n. On the other hand, bool b; istringstream buf("tr"); buf >> boolalpha >> b; sets both eofbit and failbit: there was not enough characters to complete the parsing of the boolean true.
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  • As sobrecargas de caracteres de extracção de operator>>std::basic_istream, se o fim do fluxo for atingido antes do limite (se for o caso) sobre o número de caracteres a serem extraídos.
    Original:
    The character extraction overloads of operator>>std::basic_istream, if the end of the stream is reached before the limit (if any) on the number of characters to be extracted.
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  • O std::get_time manipulador I / O e qualquer uma das funções de análise std::time_get: time_get::get, time_get::get_time, time_get::get_date, etc, se o fim do fluxo for alcançado antes do último caractere necessário para analisar o valor de data / hora prevista foi processado.
    Original:
    The std::get_time I/O manipulator and any of the std::time_get parsing functions: time_get::get, time_get::get_time, time_get::get_date, etc., if the end of the stream is reached before the last character needed to parse the expected date/time value was processed.
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  • O std::get_money manipulador I / O e função money_get::get, se o fim do fluxo for alcançado antes do último caractere necessário para analisar o valor monetário esperado foi processado.
    Original:
    The std::get_money I/O manipulator and money_get::get function, if the end of the stream is reached before the last character needed to parse the expected monetary value was processed.
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  • O construtor basic_istream::sentry, executado no início de cada função de entrada formatada: a menos que o bit é skipws unset (por exemplo, através da emissão de std::noskipws), sentinela lê e descarta os personagens principais espaços em branco. Se o fim do fluxo de entrada é atingido durante esta operação, tanto eofbit failbit e são definidas, e nenhuma entrada tem lugar.
    Original:
    The basic_istream::sentry constructor, executed at the beginning of every formatted input function: unless the skipws bit is unset (e.g. by issuing std::noskipws), sentry reads and discards the leading whitespace characters. If the end of the input stream is reached during this operation, both eofbit and failbit are set, and no input takes place.
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  • O manipulador std::ws I / O, se atinge o final do fluxo, enquanto consome espaço em branco (mas, ao contrário da sentinela entrada formatada, ele não define failbit, neste caso)
    Original:
    The I/O manipulator std::ws, if it reaches the end of the stream while consuming whitespace (but, unlike the formatted input sentry, it does not set failbit in this case)
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  • As funções de entrada não formatados basic_istream::read, basic_istream::get, e basic_istream::getline, quando chegar ao fim do fluxo.
    Original:
    The unformatted input functions basic_istream::read, basic_istream::get, and basic_istream::getline, when reaching the end of the stream.
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  • O descarte basic_istream::ignore função de entrada, quando chegar ao fim do fluxo antes de atingir o caractere delimitador especificado.
    Original:
    The discard input function basic_istream::ignore, when reaching the end of the stream before reaching the specified delimiter character.
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  • O basic_istream::readsome função imediata entrada, se basic_streambuf::in_avail retorna -1
    Original:
    The immediate input function basic_istream::readsome, if basic_streambuf::in_avail returns -1
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As seguintes funções de limpar eofbit como um efeito colateral:
Original:
The following functions clear eofbit as a side-effect:
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[editar] O failbit

O failbit é definido pelos seguintes funções da biblioteca padrão:
Original:
The failbit is set by the following standard library functions:
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[editar] O badbit

O badbit é definido pelos seguintes funções da biblioteca padrão:
Original:
The badbit is set by the following standard library functions:
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[editar] Exemplo

[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