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Multiple inheritance and constructor calls
[incr-Tcl] example from a Well House Consultants training course
More on [incr-Tcl] [link]
Source code: inherits.itcl Module: T245
#!/usr/bin/env tclsh

# Demonstration of multiple inheritance in Itcl

package require Itcl
namespace import itcl::*

# First base class

class person {
        public variable name
        public variable age
        constructor {{inname "A N Other"} {inage 21}} {
                set name $inname
                set age $inage

# Second base class

class cost {
        public variable startup
        public variable annual
        constructor {{yearly 12000} {newstart 0}} {
                set startup $newstart
                set annual $yearly
        method getmonthly {} {
                return [expr $annual/12.]

# class that multiple inherits

class employee {
        inherit person cost
        variable empnumber
        constructor {empn} {
                # Construct a cost ...
                cost::constructor 15000 } {
                # automatically constructs a person
                # with all parameters defaulted. Then the extra
                # variables are set up here
                set empnumber $empn

# Test application to use employee class

# Constructor test

employee boris 77653
employee brenda 72727

# change various inherited settings!

boris configure -name "Boris Morris"
brenda configure -age 50
brenda configure -annual 18500

# Retreive and print various attributes

foreach teammember {boris brenda} {
        set name [$teammember cget -name]
        set paythem [$teammember getmonthly]
        puts "Pay $name at $paythem per month"

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
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