[boost] [Boost-bugs] [ boost-Bugs-1643575 ] Performance problem in iostreams

From: SourceForge.net (noreply_at_[hidden])
Date: 2007-01-24 09:05:23

Bugs item #1643575, was opened at 2007-01-24 06:05
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Performance problem in iostreams

Initial Comment:

iostreams dumps its internal buffers every time seekg or tellg is called even if the seek is to the current position. The following function should check if the seek position is within the buffer and, if so, adjust the buffers.

template<typename T, typename Tr, typename Alloc, typename Mode>
typename indirect_streambuf<T, Tr, Alloc, Mode>::pos_type
indirect_streambuf<T, Tr, Alloc, Mode>::seek_impl
    (stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
{
    if (pptr() != 0)
        this->BOOST_IOSTREAMS_PUBSYNC(); // sync() confuses VisualAge 6.
    if (way == BOOST_IOS::cur && gptr())
        off -= static_cast<off_type>(egptr() - gptr());
    setg(0, 0, 0);
    setp(0, 0);
    return obj().seek(off, way, which, next_);
}

jerker.ohman_at_[hidden]

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