[Boost-bugs] [Boost C++ Libraries] #5174: Patch to make code_converter flushable

Subject: [Boost-bugs] [Boost C++ Libraries] #5174: Patch to make code_converter flushable
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-02-10 03:15:18

#5174: Patch to make code_converter flushable
--------------------------------------------------------+-------------------
 Reporter:  eddie@…                                     |       Owner:  turkanis 
     Type:  Patches                                     |      Status:  new      
Milestone:  To Be Determined                            |   Component:  iostreams
  Version:  Boost 1.45.0                                |    Severity:  Problem  
 Keywords:  code_converter flush sync buffer iostreams  |  
--------------------------------------------------------+-------------------
 I've attached a little patch that makes iostreams::code_converter
 flushable. It seems like it really should be. Is there any chance
 someone could look at this? I've included some test code as well that
 outputs the following.

 The reason I need this functionality is because I am converting the
 [http://savannah.nongnu.org/projects/fastcgipp fastcgi++] library
 over to use boost iostreams for filtering capabilities. Unfortunately
 if the code_converter can not flush it is useless.

 ********** OUTPUT BEFORE PATCH **********

 main(): Sending 24 characters of data to output stream
 SinkDev::write(): Recieved 16 characters.
 main(): Calling a sync on the output stream
 main(): Sending 21 characters of data to output stream
 SinkDev::write(): Recieved 16 characters.

 main(): Asking for 24 characters of data from input stream
 SourceDev::read(): Sending 16 characters.
 SourceDev::read(): Sending 16 characters.
 main(): Calling a sync on the input stream
 main(): Asking for 9 characters of data from input stream
 SourceDev::read(): Sending 16 characters.

 main(): At end of test case
 SinkDev::write(): Recieved 13 characters.

 ********** OUTPUT AFTER PATCH **********

 main(): Sending 24 characters of data to output stream
 SinkDev::write(): Recieved 16 characters.
 main(): Calling a sync on the output stream
 SinkDev::write(): Recieved 8 characters.
 main(): Sending 21 characters of data to output stream
 SinkDev::write(): Recieved 16 characters.

 main(): Asking for 24 characters of data from input stream
 SourceDev::read(): Sending 16 characters.
 SourceDev::read(): Sending 16 characters.
 main(): Calling a sync on the input stream
 main(): Asking for 9 characters of data from input stream
 SourceDev::read(): Sending 16 characters.

 main(): At end of test case
 SinkDev::write(): Recieved 5 characters.
 SinkDev::write(): Recieved 0 characters.
 SinkDev::write(): Recieved 0 characters.
 SinkDev::write(): Recieved 0 characters.

 ********** END **********

 Notice that input functionality doesn't change but the output
 functionality does. The one cause for concern to me is that for some
 reason upon deconstruction the new flush() function is called a bunch of
 extras times. I'm not entirely sure why this is happening.
 --
     Eddie Carle

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5174>
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