Re: [Boost-users] [iostreams] How can I use the Stream Insertion operator (<<) with a filtering_streambuf?

30 Jul 2013

      On 07/29/13 11:27, Larry Evans wrote:
...
On 07/29/13 11:10, Larry Evans wrote:
[snip]
...
BTW, I tried modifying Ken's code to use filtering_ostream instead
of filtering_streambuf, and it worked.  I also removed the ios_base
flags and it still worked.  Then I tried using stringstream instead
of filestream and it no longer worked.  Anyone have any clues about
why stringstream doesn't work?  The code is attached.  With the
attached code and attached Jamfile.v2, and with:
#define USE_STRINGSTRM
in the code, the KenApplebyStrm.output produced by bjam is
in the next attachment.
In contrast, with:
 //#define USE_STRINGSTRM
int the code, the KenApplebyStrm.output produced by bjam is
in the last attachment.
[snip]
OOPS.  The code attached previously used streambuf instead of
stream.  The current attachment uses stream.
Based on running the attached both with:

#define USE_FILT_COMPRESS

then with:

//#define USE_FILT_COMPRESS

on line 40 showed that using the gzip_decompressor starts reading
at the end of the stream instead of at the beginning.

The corresponding outputs are also attached.

This contrasts with the count filter which starts reading, as one
would expect, at the beginning of the stream.

Still trying to track down why.

-Larry