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std::basic_istream::unget

性病：基本[医]iStream：：unget

basic_istream& unget(​​

使最近提取的字符再次可用。

First clears eofbit.(since C++11)

然后，该函数表现为UnformattedInputFunction.在构造和检查哨兵对象(如果有的话)之后ios_base::iostate设置标志，则设置函数集。failbit然后回来。否则，打电话rdbuf()->sungetc()...

如果rdbuf()->sungetc()回报Traits::eof()，电话setstate(badbit)...

在任何情况下，设置gcount()对零。

参数

%280%29

返回值

*this...

例外

failure如果发生错误%28，则错误状态标志不是goodbit29%和exceptions()将被抛向那个州。

如果内部操作抛出异常，则会捕获该操作，并且badbit已经设定好了。如果exceptions()设置为badbit，异常将被重新抛出。

例

二次

#include <sstream>
#include <iostream>
 
int main()
{
    std::istringstream s1("Hello, world."
    char c1 = s1.get(
    if (s1.unget())
    {
        char c2 = s1.get(
        std::cout << "Got: " << c1 << " got again: " << c2 << '\n';
    }
}

二次

产出：

二次

Got: H got again: H

二次

另见

sungetcmoves the next pointer in the input sequence back by one (public member function of std::basic_streambuf)
getextracts characters (public member function)
peekreads the next character without extracting it (public member function)
putbackputs character into input stream (public member function)

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