在C中,每个流都有一个坏的位：
This flag is set by operations performed on the stream when an error occurs while read or writing data,generally causing the loss of integrity of the stream.
Source
什么会导致流“失去诚信”并进入坏状态？这与失败状态不同,这通常在输入流尝试将值存储到不能接受所述值的变量(如尝试将字符串存储到整数变量中)时发生.
请注意,这个问题是c++ file bad bit的一个更通用的形式,它特定于文件输入流;这个问题不是一个完全重复的,因为它一般适用于输入和输出流.
解决方法
根据
cppreference.com：
The standard library sets badbit in the following situations:
-
Insertion into the output stream by put() or write() fails for any
reason.
-
Insertion into the output stream by operator<<,std::put_money or
std::put_time,could not complete because the end of the output
stream was reached (The facet’s formatting output function such as
num_put::put() or money_put::put(),returns an iterator iter such
that iter.failed()==true)
-
Stream is constructed with a null pointer for rdbuf(),or
putback()/unget() is called on a stream with a null rdbuf(),or a
null pointer passed to operator<<(basic_streambuf*)
-
rdbuf()->sputbackc() or rdbuf()->sungetc() return traits::eof() to
putback() orunget()`
-
rdbuf()->pubsync() returns -1 to sync(),to flush(),or to the
destructor of ostream::sentry on a unitbuf stream
-
Exception is thrown during an I/O operation by any member function of
the associated stream buffer (e.g. sbumpc(),xsputn(),sgetc(),
overflow(),etc)
-
Exception is thrown in iword() or pword() (e.g. std::bad_alloc)
这可能是在www.cpluplus.com上选择cppreference.com的另一个原因,请参阅：
What’s wrong with cplusplus.com?
（编辑：李大同）
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