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[Bug libstdc++/45628] New: std::fstream::tellg invalidates I/O buffer


Querying the position in a file uses filebuf::seekoff( 0, ios::cur ). Although
the Standard specifies that this combination of parameters does not flush
putback or the output sequence, it does anyway, which results in a performance
hit. (§27.8.1.4/11)

Regression:
http://gcc.gnu.org/viewcvs/trunk/libstdc%2B%2B-v3/include/bits/fstream.tcc?r1=68163&r2=68420
(@@ -473,41 +486,26 @@)

This has been broken a long time!


-- 
           Summary: std::fstream::tellg invalidates I/O buffer
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: potswa at mac dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45628


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