Mixins

This page covers mixins. You can easily create a mixin using lobject.mixin

local lobject = require "lobject"
local MTalk   = lobject.mixin "MTalk" {
  talk = function (s) print (s) end
}

There's not much more, the last argument to mixin is in fact a table of functions, nothing more. Now you can include this either with the class definition or the .include function.

Using lobject.class

local Human = Class ("Human", MTalk) (function (argl)
  -- I haven't been able to implement multiple mixins in the arguments
  -- Help is appreciated!
  local object = {}
  object.name = argl.name or "Unknown"
  return object
end)

Using lobject.include

local Human = Class ("Human", Being) (function (argl)
  -- I haven't been able to implement multiple mixins in the arguments
  -- Help is appreciated!
  local object = {}
  object      = lobjects.include (object, MTalk)
  object.name = argl.name or "Unknown"
  return object
end)

Pretty simple, huh? You can also have a special "metamethod" on Mixin tables, they will be executed as soon as the Mixin is processed in the construction process. This key is __mixin_init and it must be set to a function.

local lobject = require "lobject"
local MTalk   = lobject.mixin "MTalk" {
  __mixin_init = function () print "I have been initialized!" end,
  talk = function (s) print (s) end
}