tcl::chan::cat(3tcl)   Reflected/virtual channel support  tcl::chan::cat(3tcl)


       tcl::chan::cat - Concatenation channel

       package require Tcl  8.5

       package require TclOO

       package require tcl::chan::core  ?1?

       package require tcl::chan::cat  ?1?

       ::tcl::chan::cat chan...


       The tcl::chan::cat package provides a command creating concatenation
       channels. These are non-seekable channels owning a list of subordinate
       channels whose contents they return in order, until all are exhausted.
       In this manner the channel is the concatentation of the contents of all
       the sub-ordinate channels.

       Note that the created channels take ownership of the channels they were
       constructed with. Whenever they have exhausted one of their channel it
       will be closed. Similarly, closing the cat channel will close all the
       sub-ordinates it still has.

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

       Event handling is delegated to the currently active sub-channel.

       ::tcl::chan::cat chan...
              This command creates the concatenation channel using all the
              provided channels, and returns its handle.

       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
       [].  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.

       concatenation channel, reflected channel, tip 219, virtual channel


       Copyright (c) 2011 Andreas Kupries <>

tcllib                                 1                  tcl::chan::cat(3tcl)