C++ 如何清除字符串流？
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How to clear stringstream?
提问by There is nothing we can do
stringstream parser;
parser << 5;
short top = 0;
parser >> top;
parser.str(""); //HERE I'M RESETTING parser
parser << 6; //DOESN'T PUT 6 INTO parser
short bottom = 0;
parser >> bottom;
Why doesn't it work?
为什么不起作用？
回答by CB Bailey
Typically to 'reset' a stringstream you need to both reset the underlying sequence to an empty string with strand to clear any fail and eof flags with clear.
通常要“重置”字符串流，您需要使用 将底层序列重置为空字符串，str并使用 清除任何失败和 eof 标志clear。
parser.str( std::string() );
parser.clear();
Typically what happens is that the first >>reaches the end of the string and sets the eof bit, although it successfully parses the first short. Operations on the stream after this immediately fail because the stream's eof bit is still set.
通常发生的情况是第一个>>到达字符串的末尾并设置 eof 位，尽管它成功地解析了第一个短。此后对流的操作立即失败，因为流的 eof 位仍然设置。
