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# tcl::chan::null(n) 1 tcllib "Reflected/virtual channel support"

## Name

tcl::chan::null - Null channel

## Synopsis

- package require Tcl 8.5
- package require TclOO
- package require tcl::chan::events ?1?
- package require tcl::chan::null ?1?

- ::tcl::chan::null

## Description

The tcl::chan::null package provides a command creating null channels, i.e. write-only channels which immediately forget whatever is written to them. This is equivalent to the null channels provided by the package Memchan, except that this is written in pure Tcl, not C. On the other hand, Memchan is usable with Tcl 8.4 and before, whereas this package requires Tcl 8.5 or higher, and TclOO.

Packages related to this are tcl::chan::zero and tcl::chan::nullzero.

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

## API

::tcl::chan::null

  This command creates a new null channel and returns its handle.

## 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. 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

/dev/null, null, reflected channel, tip 219, virtual channel

## Category

Channels

## Copyright

Copyright © 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>