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Operator overloading
More Classes and Objects example from a Well House Consultants training course
More on More Classes and Objects [link]

This example is described in the following article(s):
   • MTBF of coffee machines - [link]

This example references the following resources:
http://www.wellho.net/

Source code: olop.rb Module: R108


about =
"This demonstration shows operator overloading in
Ruby. It uses the standard mean time between failure
calculation to compute the reduced service interval
when two components each with at attention span is
added together, and overloads the '+' operator to
perform the action.

Example by Graham Ellis of Well House Consultants
Yes, we offer Ruby training - http://www.wellho.net/
or email graham@wellho.net. Public and Private courses

" # Note 6

# See training notes for full details of each of
# the notes in this example

class Compo
   def initialize(name,hours)
      if name.instance_of?(Array) # Note 1
         @name = name
      else
         @name = [name]
      end
      @hours = hours
   end
   def gethours
      return @hours
   end
   def getname
      repst = ""
      (0...@name.length).each do |k| # Note 2
          repst += sprintf("%3d. %s\n", # Note 3
                k+1, @name[k])
      end
      return repst
   end
   def getnamearr
      return @name
   end
   def + (second)
      tempname = @name + second.getnamearr
      newhours = 1.0 / (1.0 / @hours + 1.0 / second.gethours)
                        # Note 7
      linked = Compo.new(tempname,newhours)
      return linked
   end
end

if __FILE__ == $0 # Note 4
    puts about
    coffeemachine = []
    coffeemachine.push(Compo.new("fill with water",5))
    coffeemachine.push(Compo.new("fill with beans",10))
    coffeemachine.push(Compo.new("empty grounds",8))
    coffeemachine.push(Compo.new("empty spill",7))

    actions = Compo.new("Thorough Clean",30)
    coffeemachine.each do |job|
        actions = actions + job # Note 5
    end

    schedule = actions.getname
    frequency = sprintf("%.2f",actions.gethours)

    print "The actions are \n#{schedule}"
    print "The average attention interval is #{frequency} hours\n"

    end
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Ruby
 * Ruby 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 Ruby 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 "More Classes and Objects" training module. You'll find a description of the topic and some other closely related examples on the "More Classes and Objects" 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.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

Web site author
This web site is written and maintained by Well House Consultants.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

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