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      std::ws

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      < cpp‎ | io‎ | manip

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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)
       
      Entrada / saída manipuladores
      De ponto flutuante de formatação
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      Floating-point formatting
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      Formatação inteiro
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      Integer formatting
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      Formatação booleana
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      Boolean formatting
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      Largura do campo e controle de preenchimento
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      Field width and fill control
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      Outra formatação
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      Other formatting
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      Espaços de processamento
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      Whitespace processing
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      Saída de descarga
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      Output flushing
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      Sinalizadores de status manipulação
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      Status flags manipulation
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      Tempo e dinheiro I / O
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      Time and money I/O
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      (C++11)
      (C++11)
      (C++11)
      (C++11)
       
      Definido no cabeçalho <istream>
      template<class CharT, class Traits >
      std::basic_istream<CharT,Traits>& ws(std::basic_istream<CharT, Traits>& is );
      Descarta o espaço em branco a partir de um fluxo de entrada.
      Original:
      Discards leading whitespace from an input stream.
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      Se comporta como um UnformattedInputFunction, exceto que is.gcount() não seja modificado. Depois de construir e verificar o objeto de sentinela, extrai os caracteres do fluxo e descarta-los até qualquer uma das seguintes condições ocorre:
      Original:
      Behaves as an UnformattedInputFunction, except that is.gcount() is not modified. After constructing and checking the sentry object, extracts characters from the stream and discards them until any one of the following conditions occurs:
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      • condição de fim de arquivo ocorre na seqüência de entrada (caso em que a função chama setstate(eofbit) mas não define failbit.
        Original:
        end of file condition occurs in the input sequence (in which case the function calls setstate(eofbit) but does not set failbit.
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      • c o próximo caractere disponível na seqüência de entrada não é espaço em branco como determinado pelo std::isspace(c, is.getloc())., o carácter não-branco não é extraído.
        Original:
        the next available character c in the input sequence is not whitespace as determined by std::isspace(c, is.getloc()). The non-whitespace character is not extracted.
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      Isto é uma entrada de somente manipulador de I / O, que pode ser chamada com uma indicação tal como in << std::ws para qualquer tipo de instd::basic_istream.
      Original:
      This is an input-only I/O manipulator, it may be called with an expression such as in << std::ws for any in of type std::basic_istream.
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      Índice

      [editar]Parâmetros

      is -
      referência ao fluxo de entrada
      Original:
      reference to input stream
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      [editar]Valor de retorno

      is (referência ao fluxo após a extracção consecutiva de espaços em branco)
      Original:
      is (reference to the stream after extraction of consecutive whitespace)
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      [editar]Exemplo

      #include <iostream>#include <sstream>int main(){std::istringstream s(" this is a test");std::string line; s >> std::ws; getline(s, line);std::cout<<"ws + getline returns: \""<< line <<"\"\n";}

      Saída: 

      ws + getline returns: "this is a test"

      [editar]Veja também

      extratos e personagens descarta até o caráter dado foi encontrado
      Original:
      extracts and discards characters until the given character is found
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      (of std::basic_istream função pública membro)[edit]
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/io/manip/ws&oldid=20836"
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