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Section: 22.214.171.124 [stringbuf.virtuals] Status: New Submitter: Sergey Zubkov Opened: 2013-08-29 Last modified: 2017-02-03
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In 126.96.36.199 [stringbuf.virtuals]/1, basic_stringbuf::underflow() is specified to unconditionally return traits::eof() when a read position is not available.The semantics of basic_stringbuf require, and existing libraries implement it so that this function makes a read position available if possible to do so, e.g. if some characters were inserted into the stream since the last call to overflow(), resulting in pptr() > egptr(). Compare to the conceptually similar D.7.2.3 [depr.strstreambuf.virtuals]/15.
This wording is relative to N3691.
Change 188.8.131.52 [stringbuf.virtuals] as indicated:
-1- Returns: If the input sequence has a read position available , returns traits::to_int_type(*gptr()). Otherwise, returns traits::eof(). Any character in the underlying buffer which has been initialized is considered to be part of the input sequence.