NAME

       tcl::transform::observe - Observer transformation, stream copy

SYNOPSIS

       package require Tcl  8.6

       package require tcl::transform::core  ?1?

       package require tcl::transform::observe  ?1?

       ::tcl::transform::observe chan logw logr

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DESCRIPTION

       The  tcl::transform::observer package provides a command creating a channel transformation
       which passes the read and written bytes through unchanged (like tcl::transform::identity),
       but additionally copies the data it has seen for each direction into channels specified at
       construction time.

       Related    transformations     in     this     module     are     tcl::transform::adler32,
       tcl::transform::counter, tcl::transform::crc32, and tcl::transform::identity.

       The  internal  TclOO  class  implementing  the  transform  handler  is  a sub-class of the
       tcl::transform::core framework.

API

       ::tcl::transform::observe chan logw logr
              This command creates an observer transformation on top  of  the  channel  chan  and
              returns  its handle. The channel handles logr and logw are there the data is copied
              to.

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.   Please  report  such  in  the  category  virtchannel  of  the  Tcllib Trackers
       [http://core.tcl.tk/tcllib/reportlist].  Please also report any ideas for enhancements you
       may have for either package and/or documentation.

       When proposing code changes, please provide unified diffs, i.e the output of diff -u.

       Note further that attachments are strongly preferred over inlined patches. Attachments can
       be made by going to the Edit form of the ticket immediately after its creation,  and  then
       using the left-most button in the secondary navigation bar.

KEYWORDS

       channel transformation, observer, reflected channel, stream copy, tip 230, transformation,
       virtual channel

CATEGORY

       Channels

COPYRIGHT

       Copyright (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>