---
name: "tcllib_variable"
section: "3tcl"
platform: "linux"
package: "tcllib"
version: "2.0+dfsg-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/tcllib_variable"
---

# tcllib\_variable(3tcl)

In-memory channel using variable for storage

```

```

## NAME

tcl::chan::variable - In-memory channel using variable for storage

## SYNOPSIS

package require **Tcl 8.5 9**

package require **TclOO**

package require **tcl::chan::events ?1.1?**

package require **tcl::chan::variable ?1.0.5?**

**::tcl::chan::variable** *varname*

```

```

## DESCRIPTION

The **tcl::chan::variable** package provides a command creating channels which live purely in memory. They provide random-access, i.e. are seekable. In contrast to the channels created by **tcl::chan::memchan** the data is not hidden in the channel however, but stored in an associated variable, specified at the time of construction.

Packages related to this are **tcl::chan::memchan** and **tcl::chan::string**.

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

## API

- **::tcl::chan::variable** *varname*

  This command creates a new variable channel and returns its handle. The content of the channel is stored in the associated namespace variable *varname*.

## 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

in-memory channel, reflected channel, tip 219, virtual channel

## CATEGORY

Channels

## COPYRIGHT

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