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Using packages and namespaces together
Libraries, Packages and Namespaces example from a Well House Consultants training course
More on Libraries, Packages and Namespaces [link]

This example is described in the following article(s):
   • Tcl - learning how to use namespaces, packages and libraries together - [link]

Source code: dinpack Module: T213
lappend auto_path /Users/grahamellis/jtc/stuffing

set comment {
This is an example script that calls in two packages
called chicken and goose from a library. Each of the
two packages is in the same namespace as the name of
the package (to make it easier to understand and
maintain) event though - technically speaking - the
package and namespace facilities are not related. }

package require chicken
package require goose

# The following line mean that any names that were
# made available from the goose namespace may be used
# here without a goose:: prefix.

namespace import goose::*

set people 12

# Run the sizebird command in each of chicken and goose
# because we have different namespaces, we can have two
# commands with the same name.

set kilos [chicken::sizebird $people]
puts "You need a ${kilos}kgs bird if it's a chicken"

set kilos [goose::sizebird $people]
puts "You need a ${kilos}kgs bird if it's a goose"

# and run the "default" one - i.e. the one in the global
# namespace; this is the goose one because of the import

set kilos [sizebird $people]
puts "You need a ${kilos}kgs bird if it's imported"
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Tcl
 * Tcl Programming
 * Tcl Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Tcl, Tk and Expect are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Libraries, Packages and Namespaces" training module. You'll find a description of the topic and some other closely related examples on the "Libraries, Packages and Namespaces" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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