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std::basic_istream<CharT,Traits>::ignore - cppreference.com

Extracts and discards characters from the input stream until and including delim.

ignore behaves as an UnformattedInputFunction. After constructing and checking the sentry object, it extracts characters from the stream and discards them until any of the following conditions occurs:

• count characters were extracted. This test is disabled in the special case when count equals std::numeric_limits<std::streamsize>::max().

• end of file conditions occurs in the input sequence, in which case the function calls setstate(eofbit).

• 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().

*this

if an error occurred (the error state flag is not

) and

is set to throw for that state.

If an internal operation throws an exception, it is caught and badbit is set. If exceptions() is set for badbit, the exception is rethrown.

The following example uses ignore to skip over non-numeric input:

#include <iostream>
#include <limits>
#include <sstream>
 
constexpr auto max_size = std::numeric_limits<std::streamsize>::max();
 
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(max_size, '\n'); // skip bad input
        }
        else
            std::cout << n << '\n';
    }
}

Output:

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

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