Varianti

    std::basic_istream::ignore

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    <metanoindex/>

     
    C++
     
    Ingresso / libreria di output
    I / O manipolatori
    C-style I / O
    Buffer
    Original:
    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf(deprecato)
    Streams
    Original:
    Streams
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    Astrazioni
    Original:
    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
    String I / O
    Original:
    String I/O
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    basic_istringstream
    basic_ostringstream
    basic_stringstream
    Array I / O
    Original:
    Array I/O
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    istrstream(deprecato)
    ostrstream(deprecato)
    strstream(deprecato)
    Tipi
    Original:
    Types
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    streamoff
    streamsize
    fpos
    Errore categoria interfaccia
    Original:
    Error category interface
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    iostream_category(C++11)
    io_errc(C++11)
     
    std::basic_istream
    Gli oggetti globali
    Original:
    Global objects
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    cin
    wcin
    Membri funzioni
    Original:
    Member functions
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    basic_istream::basic_istream
    basic_istream::~basic_istream
    basic_istream::operator=(C++11)
    Ingresso formattato
    Original:
    Formatted input
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    basic_istream::operator>>
    Ingresso non formattato
    Original:
    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
    Posizionamento
    Original:
    Positioning
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    basic_istream::tellg
    basic_istream::seekg
    Varie
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    Miscellaneous
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    basic_istream::sync
    basic_istream::swap(C++11)
    Membri classi
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    Member classes
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    basic_istream::sentry
    Non membri funzioni
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    Non-member functions
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    operator>>(std::basic_istream)
     
    <tbody> </tbody>
    basic_istream& ignore( std::streamsize count = 1, int_type delim = Traits::eof() );
    Estratti e scarta caratteri dal flusso di input fino e compreso delim.
    Original:
    Extracts and discards characters from the input stream until and including delim.
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    Si comporta come UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella, estrae i caratteri dal flusso e scarta loro fino a quando una delle seguenti condizioni:
    Original:
    Behaves as UnformattedInputFunction. 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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    • Caratteri count stati estratti (questo test è disattivato nel caso particolare in cui count uguale std::numeric_limits<std::streamsize>::max()
      Original:
      count characters were extracted (this test is disabled in the special case when count equals std::numeric_limits<std::streamsize>::max()
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    • Fine condizioni file avviene nella sequenza di input (nel qual caso la funzione chiama setstate(eofbit)
      Original:
      end of file conditions occurs in the input sequence (in which case the function calls setstate(eofbit)
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    • c il successivo carattere disponibile nella sequenza di input è delim come determinato da Traits::eq_int_type(Traits::to_int_type(c), delim). Il carattere di delimitazione viene estratto ed eliminato (questo test è disabilitata se è delim Traits::eof())
      Original:
      the next available character c in the input sequence is delim as determined by Traits::eq_int_type(Traits::to_int_type(c), delim). The delimiter character is extracted and discarded (this test is disabled if delim is Traits::eof())
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    Parametri

    count -
    numero di caratteri da estrarre
    Original:
    number of characters to extract
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    delim -
    delimitando carattere per fermare l'estrazione a. È anche estratto .
    Original:
    delimiting character to stop the extraction at. It is also extracted.
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    Valore di ritorno

    *this

    Esempio

    #include <iostream>
#include <sstream>
#include <limits>
int main()
{
    std::istringstream input("1\n"
                             "some non-numeric input\n"
                             "2\n");
    for(;;) {
        int n;
        input >> n;

        if(input.eof() || input.bad())
            break;
        else if(input.fail()) {
            input.clear(); // unset failbit
            input.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); // skip bad input
        } else
            std::cout << n << '\n';
    }
}

    Output: 

    1
2

    Vedi anche
    estratti di caratteri
    Original:
    extracts characters
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    (metodo pubblico) [modifica]
    caratteri estratti fino a quando il carattere dato è stato trovato
    Original:
    extracts characters until the given character is found
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    (metodo pubblico) [modifica]