id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
817	Performance problem in iostreams	nobody	Jonathan Turkanis	"{{{

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@umetrics.com
}}}"	Bugs	closed		iostreams	None	Problem	fixed