Question

我正在尝试声明一个用于反转数字的字符串流以查看它是否是回文（输入是传入函数的int） -

2015-08-08 15:08:27 [scrapy] INFO: Scrapy 1.0.1 started (bot: scrapybot)
2015-08-08 15:08:27 [scrapy] INFO: Optional features available: ssl, http11, bot
o
2015-08-08 15:08:27 [scrapy] INFO: Overridden settings:     {'LOGSTATS_INTERVAL': 0}

2015-08-08 15:08:27 [scrapy] INFO: Enabled extensions: CloseSpider,       TelnetConsol
e, CoreStats, SpiderState
2015-08-08 15:08:28 [boto] DEBUG: Retrieving credentials from metadata server.
2015-08-08 15:08:29 [boto] ERROR: Caught exception reading instance data
Traceback (most recent call last):
File "C:\Users\lib\site-packages\boto\utils.py", line 210, in     retry_url
    r = opener.open(req, timeout=timeout)
File "C:\Users\lib\urllib2.py", line 431, in open
    response = self._open(req, data)
File "C:\Users\lib\urllib2.py", line 449, in _open
'_open', req)
File "C:\Users\lib\urllib2.py", line 409, in _call_chain
  result = func(*args)
File "C:\Users\lib\urllib2.py", line 1227, in http_open
  return self.do_open(httplib.HTTPConnection, req)
File "C:\Users\lib\urllib2.py", line 1197, in do_open
  raise URLError(err)
URLError: <urlopen error timed out>
2015-08-08 15:08:29 [boto] ERROR: Unable to read instance data, giving up
2015-08-08 15:08:29 [scrapy] INFO: Enabled downloader middlewares:     HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware,   RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-08-08 15:08:29 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-08-08 15:08:29 [scrapy] INFO: Enabled item pipelines:
2015-08-08 15:08:29 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023

我在这个问题之后对其进行了建模 -

Easiest way to convert int to string in C++

为什么我收到此错误？

聚合＆＃39; std :: stringstream ssInput＆＃39;有不完整的类型，不能被定义| || ===构建失败：1个错误，0个警告（0分钟， 0秒（s））=== |

Answer 1

你有没有

demo

？还需要添加使用命名空间std或使用完全限定名称std :: stringstream而不是简单的stringstream。

为什么声明一个字符串流会出现一个＆＃34;不完整类型的错误＆＃34;？

1 个答案: