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std::basic_stringbuf::pbackfail

性病：基本[医]Strucbuf：：pbackFailure

protected: virtual int_type pbackfail( int_type c = Traits::eof() )​​

此受保护的虚拟函数由公共函数调用。basic_streambuf::sungetc和basic_streambuf::sputbackc%28，依次被basic_istream::unget和basic_istream::putback29%。

1%29调用方请求GET区域由一个字符%28备份pbackfail()调用时，不带任何参数，也不带Traits::eof()作为论点%29

首先，检查是否有一个备用位置，如果真的有%27T，则失败。%28 string buf没有外部字符源来重新读取%29。

B%29如果呼叫方出错，并且实际上可以使用回发位置，则只需减少basic_streambuf::gptr()，例如通过打电话gbump(-1)...

2%29调用者尝试将一个与先前检索的字符不同的字符pbackfail()使用需要返回%29的字符调用，在这种情况下

首先检查是否有一个回放位置，如果有%27T，则检查失败。

B%29然后检查哪个字符处于回推位置。如果那里的字符已经等于c，由Traits::eq(to_char_type(c), gptr()[-1])，然后简单地减少basic_streambuf::gptr()...

否则，如果缓冲区仅供读取，则失败。

如果缓冲区为写入%28打开，则为D%29。mode &&std::ios_base::out为非零%29，则递减basic_streambuf::gptr()写c调整后指向gptr%28%29的位置。

参数

c-the character to put back, or Traits::eof() to indicate that backing up of the get area is requested

返回值

c关于成功，除非c原Traits::eof()，在这种情况下Traits::not_eof(c)会被归还。

Traits::eof()在失败的时候。

例

另见

pbackfail virtualputs a character back into the input sequence, possibly modifying the input sequence (virtual protected member function of std::basic_streambuf)
sungetcmoves the next pointer in the input sequence back by one (public member function of std::basic_streambuf)
sputbackcputs one character back in the input sequence (public member function of std::basic_streambuf)
ungetunextracts a character (public member function of std::basic_istream)
putbackputs character into input stream (public member function of std::basic_istream)

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