true). Then (if good), it reads one character from its associated stream buffer object by calling its member function sgetc, and finally destroys the sentry object before returning.
EOF), and leaves the proper internal state flags set:
|eofbit||No character could be peeked because the input sequence has no characters available (end-of-file reached).|
|failbit||The construction of sentry failed (such as when the stream state was not good before the call).|
|badbit||Error on stream (such as when this function catches an exception thrown by an internal operation).|
When set, the integrity of the stream may have been affected.
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