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Creating and using objects, cget and configure
[incr-Tcl] example from a Well House Consultants training course
More on [incr-Tcl] [link]

This example is described in the following article(s):
   • Objects in Tcl - iTcl - updated first steps example - [link]

Source code: ootcl02 Module: T245
#!/usr/bin/env tclsh

# Creating and using objects, cget and configure

# Load in the Object Oriented extension
package require Itcl

itcl::class train {
        variable len
        variable seat
        variable when
        public variable where
        constructor {length seats time destination} {
                set len $length
                set seat $seats
                set when $time
                set where $destination

        method getcapacity {} {
                return [expr int(1.4 * $seat * $len)]

# Above here - the bits that define the detail of my things
# ---------------------------------------------------------
# Below here - the code that uses my things

set ocount 0
set s1 [train train_[incr ocount] 2 75 "06:38" "Southampton Central"]
set s2 [train train_[incr ocount] 1 78 "07:49" "Swindon"]

set services [list $s1 $s2]

$s1 configure -where "Marchwood"

foreach service $services {
        set capacity [$service getcapacity]
        set to [$service cget -where]
        puts "That can take $capacity people to $to"

# Sample Output
# munchkin:logs grahamellis$ tclsh ootcl02
# That can take 210 people to Marchwood
# That can take 109 people to Swindon
# munchkin:logs grahamellis$

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 "[incr-Tcl]" training module. You'll find a description of the topic and some other closely related examples on the "[incr-Tcl]" 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
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