[comment {-*- tcl -*- doctools manpage}]
[manpage_begin tcl::chan::null n 1.1]
[keywords /dev/null]
[keywords null]
[keywords {reflected channel}]
[keywords {tip 219}]
[keywords {virtual channel}]
[copyright {2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>}]
[moddesc   {Reflected/virtual channel support}]
[category  Channels]
[titledesc {Null channel}]
[require Tcl "8.5 9"]
[require TclOO]
[require tcl::chan::events [opt 1.1]]
[require tcl::chan::null [opt 1.1]]
[description]
[para]

The [package 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 [package Memchan], except that this is written in pure Tcl,
not C. On the other hand, [package Memchan] is usable with Tcl 8.4 and
before, whereas this package requires Tcl 8.5 or higher, and
[package TclOO].

[para] Packages related to this are [package tcl::chan::zero] and
[package tcl::chan::nullzero].

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

[section API]

[list_begin definitions]

[call [cmd ::tcl::chan::null]]

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

[list_end]

[vset CATEGORY virtchannel]
[include ../common-text/feedback.inc]
[manpage_end]
