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std::basic_filebuf::underflow

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< cpp‎ | io‎ | basic filebuf

 
 
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
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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
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Membro funções públicas
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator=(C++11)
basic_filebuf::swap(C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
Protegido funções de membro
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
Não-membros funções
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Non-member functions
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swap(std::basic_filebuf)(C++11)
 
protected:
virtual int_type underflow()
Se comporta como o std::basic_streambuf::underflow classe base, exceto que a leitura dos dados da seqüência de caracteres associada (o arquivo) para a área de get, primeiro lê os bytes do arquivo em um buffer temporário (alocados tão grande quanto necessário), então usa de std::codecvt::in a região impregnada para converter a representação (tipicamente, de vários bytes) externa para a forma interna, que é então utilizado para preencher a área get. A conversão pode ser ignorado se a localidade de std::codecvt::always_noconv retornos true
Original:
Behaves like the base class std::basic_streambuf::underflow, except that to read the data from the associated character sequence (the file) into the get area, first reads the bytes from the file into a temporary buffer (allocated as large as necessary), then uses std::codecvt::in of the imbued locale to convert the external (typically, multibyte) representation to the internal form which is then used to populate the get area. The conversion may be skipped if the locale's std::codecvt::always_noconv returns true
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Índice

[editar] Parâmetros

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

Traits::to_int_type(*gptr()) (o primeiro caractere da seqüência pendente) em caso de sucesso, ou Traits::eof() em caso de falha.
Original:
Traits::to_int_type(*gptr()) (the first character of the pending sequence) in case of success, or Traits::eof() in case of failure.
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[editar] Exemplo

[editar] Veja também

[virtual]
lê caracteres da seqüência de entrada associado para a área get
Original:
reads characters from the associated input sequence to the get area
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(virtual protegido of std::basic_streambuf função de membro) [edit]
[virtual]
lê o arquivo associado e avanços o ponteiro próximo da região get
Original:
reads from the associated file and advances the next pointer in the get area
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(virtual protegido função de membro) [edit]
[virtual]
escreve caracteres para o arquivo associado da área de venda
Original:
writes characters to the associated file from the put area
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(virtual protegido função de membro) [edit]