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std::basic_streambuf::uflow

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< cpp‎ | io‎ | basic streambuf

 
 
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_streambuf
Membro funções públicas
Original:
Public member functions
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basic_streambuf::~basic_streambuf
Localidades
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Locales
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basic_streambuf::pubimbue
basic_streambuf::getloc
Posicionamento
Original:
Positioning
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basic_streambuf::pubsetbuf
basic_streambuf::pubseekoff
basic_streambuf::pubseekpos
basic_streambuf::pubsync
Obter área
Original:
Get area
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basic_streambuf::in_avail
basic_streambuf::snextc
basic_streambuf::sbumpc
basic_streambuf::sgetc
basic_streambuf::sgetn
Coloque área
Original:
Put area
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basic_streambuf::sputc
basic_streambuf::sputn
Putback
Original:
Putback
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basic_streambuf::sputbackc
basic_streambuf::sungetc
Protegido funções de membro
Original:
Protected member functions
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basic_streambuf::basic_streambuf
basic_streambuf::operator=(C++11)
basic_streambuf::swap(C++11)
Localidades
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Locales
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basic_streambuf::imbue
Posicionamento
Original:
Positioning
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basic_streambuf::setbuf
basic_streambuf::seekoff
basic_streambuf::seekpos
basic_streambuf::sync
Obter área
Original:
Get area
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basic_streambuf::showmanyc
basic_streambuf::underflow
basic_streambuf::uflow
basic_streambuf::xsgetn
basic_streambuf::eback
basic_streambuf::gptr
basic_streambuf::egptr
basic_streambuf::gbump
basic_streambuf::setg
Coloque área
Original:
Put area
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basic_streambuf::xsputn
basic_streambuf::overflow
basic_streambuf::pbase
basic_streambuf::pptr
basic_streambuf::epptr
basic_streambuf::pbump
basic_streambuf::setp
Putback
Original:
Putback
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basic_streambuf::pbackfail
 
int_type uflow();
Garante que pelo menos um caracter está disponível na área de entrada, actualizando os ponteiros para a área de entrada (se necessário). Em caso de sucesso retorna o valor do caráter e avanços o valor da' ponteiro começar por um caractere. No retorno de falha traits::eof().
Original:
Ensures that at least one character is available in the input area by updating the pointers to the input area (if needed). On success returns the value of that character and advances the value of the get pointer by one character. On failure returns traits::eof().
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A função pode atualizar gptr, egptr e eback ponteiros para definir a localização dos dados recém-carregados (se houver). Em caso de falha, a função que assegura quer gptr() == nullptr ou gptr() == egptr.
Original:
The function may update gptr, egptr and eback pointers to define the location of newly loaded data (if any). On failure, the function ensures that either gptr() == nullptr or gptr() == egptr.
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A versão da classe base da função chama underflow. As classes derivadas podem substituir essa função para permitir atualizações para a área get no caso de exaustão.
Original:
The base class version of the function calls underflow. The derived classes may override this function to allow updates to the get area in the case of exhaustion.
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Índice

[editar] Parâmetros

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

O valor do personagem que foi apontado pelo ponteiro' começar antes de ter sido avançado por um, ou de outro modo traits::eof().
Original:
The value of the character that was pointed to by the get pointer before it was advanced by one, or traits::eof() otherwise.
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A versão classe base da função retorna o valor retornado pelo underflow.
Original:
The base class version of the function returns the value returned by underflow.
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[editar] Nota

As funções públicas de std::streambuf chamar esta função somente se gptr() == nullptr ou gptr() >= egptr().
Original:
The public functions of std::streambuf call this function only if gptr() == nullptr or gptr() >= egptr().
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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 função de membro) [edit]
[virtual]
escreve caracteres para a seqüência de saída associado da área de venda
Original:
writes characters to the associated output sequence from the put area
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(virtual protegido função de membro) [edit]