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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Tcl - learning how to use namespaces, packages and libraries together

Tcl supports both packages (which allow code to be loaded from libraries at run time) and namespaces (which allow for procs and variables to be grouped together to allow you to avoid conflicts as you use code from lots of different sources). Strictly speaking, the two sets of facilities are independent but in practice they're used together, with the name of the package and the name of the namespace usually being the same.

Having covered both topics independently on yesterday's course, I went on to write a short new example that shows how they work together and I've added the course code of that example to our web site - this is an example that shows you a lot in a few lines!

Source code of the main program - here
Source code of the packages it loads - here and here

Sample output:

Dorothy:jtc grahamellis$ tclsh dinpack
Copyright Well House Consultants, 2008
Copyright Well House Consultants, 2008
You need a 11.0kgs bird if it's a chicken
You need a 13.9kgs bird if it's a goose
You need a 13.9kgs bird if it's imported
Dorothy:jtc grahamellis$


This subject covered on our Public Tcl Course. There's a lot to cover on that course, so it's quite a short section. Also covered on private courses at our centre which are tailored to meet your needs (Full list of modules on Tcl). For larger groups, we can also run courses at you own office
(written 2008-02-02)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T213 - Tcl/Tk - Libraries, Packages and Namespaces
  [146] example of Tcl namespaces and packages - (2004-12-10)
  [1339] Packages and Namespaces are like Suitcases and Aircraft - (2007-09-09)
  [2476] Tcl - uplevel to run code at calling level - (2009-10-24)
  [3066] Separating groups of variables into namespaces - (2010-11-24)
  [3417] What is a namespace and why do we need them? - (2011-09-03)
  [3418] Tcl packages, pkg_mkIndex, pkgIndex.tcl -what are they and why use them. - (2011-09-03)
  [4522] Loading packages in your Tcl program - (2015-10-09)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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