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std::basic_istream::seekg

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< cpp‎ | io‎ | basic istream

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C++
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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(obsoleta)
Streams
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Streams
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Abstrações
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Abstractions
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File I / O
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File I/O
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Cordas I / O
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String I/O
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Matriz de I / O
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Array I/O
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(obsoleta)
(obsoleta)
(obsoleta)
Tipos
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Types
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Interface de categoria de erro
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Error category interface
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(C++11)
(C++11)
 
std::basic_istream
Objetos globais
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Global objects
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Funções de membro
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada formatada
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Formatted input
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basic_istream::operator>>
Entrada não formatado
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Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Posicionamento
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Positioning
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basic_istream::tellg
basic_istream::seekg
Diversos
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Aulas-Membros
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Member classes
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basic_istream::sentry
Não-membros funções
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Non-member functions
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basic_istream& seekg( pos_type pos );
basic_istream& seekg( off_type off, std::ios_base::seekdir dir);
Define indicador de entrada de posição do objeto atual streambuf associado. Em caso de falha, chama setstate(std::ios_base::failbit).
Original:
Sets input position indicator of the current associated streambuf object. In case of failure, calls setstate(std::ios_base::failbit).
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Primeiro, limpa eofbit(desde C++11), em seguida, se comporta como UnformattedInputFunction, exceto que gcount() não é afetado. Depois de construir e verificar o objeto de sentinela
Original:
First, clears eofbit(desde C++11), then behaves as UnformattedInputFunction, except that gcount() is not affected. After constructing and checking the sentry object,
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1)
define o indicador de posição de entrada para pos valor absoluto (em relação ao início do ficheiro). Especificamente, é executada rdbuf()->pubseekpos(pos, std::ios_base::in).
Original:
sets the input position indicator to absolute (relative to the beginning of the file) value pos. Specifically, executes rdbuf()->pubseekpos(pos, std::ios_base::in).
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2)
define o indicador de posição de entrada para off posição, em relação à posição, definida por dir. Especificamente, é executada rdbuf()->pubseekoff(off, dir, std::ios_base::in).
Original:
sets the input position indicator to position off, relative to position, defined by dir. Specifically, executes rdbuf()->pubseekoff(off, dir, std::ios_base::in).
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Índice

[editar] Parâmetros

pos -
posição absoluta para definir o indicador de posição de entrada para .
Original:
absolute position to set the input position indicator to.
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off -
posição relativa para definir o indicador de posição de entrada para .
Original:
relative position to set the input position indicator to.
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dir -
define a posição de base para aplicar a diferença relativa a. Ela pode ser uma das seguintes constantes:
Constante
Original:
Constant
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 Explanation
beg
o início de um fluxo
Original:
the beginning of a stream
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end
o fim de um córrego
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the ending of a stream
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cur
a posição atual do indicador de posição de fluxo
Original:
the current position of stream position indicator
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Original:
defines base position to apply the relative offset to. It can be one of the following constants:
Constante
Original:
Constant
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 Explanation
beg
o início de um fluxo
Original:
the beginning of a stream
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end
o fim de um córrego
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the ending of a stream
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cur
a posição atual do indicador de posição de fluxo
Original:
the current position of stream position indicator
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[editar] Valor de retorno

*this

[editar] Exemplo

#include <iostream>
#include <string>
#include <sstream>
int main()
{
    std::string str = "Hello, world";
    std::istringstream in(str);
    std::string word1, word2;
    in >> word1;
    in.seekg(0); // rewind
    in >> word2;
    std::cout << "word1 = " << word1 << '\n'
              << "word2 = " << word2 << '\n';
}

Saída: 

word1 = Hello,
word2 = Hello,

[editar] Veja também
retorna o indicador de posição de entrada
Original:
returns the input position indicator
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(função pública membro) [edit]
retorna o indicador de posição de saída
Original:
returns the output position indicator
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(of std::basic_ostream função pública membro) [edit]
define o indicador de posição de saída
Original:
sets the output position indicator
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(of std::basic_ostream função pública membro) [edit]
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