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using tables as classic objects
Object Orientation - the Lua way example from a Well House Consultants training course
More on Object Orientation - the Lua way [link]

This example is described in the following article(s):
   • Classic style OO code - in Lua - [link]

Source code: train_objects Module: U107
--[[
using tables as classic objects
]]


-- Defining functions about trains

-- "Constructor"

train = {}
function train.new(cars,seats,time,destiny)
        local info = {}
        info.cars = cars
        info.seats = seats
        info.time = time
        info.destiny = destiny
        setmetatable(info,meta_train)
        return info
end

function train.getCapacity(current)
        return math.floor(1.4 * current.cars * current.seats)
end

---- Define how our objects will behave in non-default circumstances

meta_train = {} -- Table of code for how a train does things!
function meta_train.__tostring(which)
        return ("To " .. which.destiny .. " at " .. which.time)
end
function meta_train.__index(tom,dick) -- other definitions
        if dick == "getCapacity" then
                return train.getCapacity
        end
        return "Dunno how to do that"
end

-- Define instances of our objects -------------------------------

-- This is what looks like "classic" OO code!

south = train.new(3,78,"06:42","Southampton")
north = train.new(1,79,"07:48","Swindon")
services = {north,south}

-- Manipulate them ---------------------------

for k,service in ipairs(services) do
        print(k,service) -- behaves via __tostring
        print(service:getCapacity()) -- behaves via __index
end

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Lua
 * Lua Programming
 * Lua 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 Lua 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 "Object Orientation - the Lua way" training module. You'll find a description of the topic and some other closely related examples on the "Object Orientation - the Lua way" 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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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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