Object Orientation Class Closure Example

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-- example class

Class = {

  

  -- class vars

  class_var = 123,

  

  -- ctor

  new = function()

    local self = {}

    

    -- member vars

    self.member_var = 456

    

    -- methods

    self.method = function()

      self.member_var = self.member_var + 1

    end

    

    return self

  end,

  

  -- static methods

  static_method = function()

  end,

}



-- example derived class

DerivedClass = {

  new = function()

    self = Class.new() -- base class

    

    -- override a method

    self.method = function()

      self.member_var = self.member_var + 2

    end

    

    return self

  end,

}



-- example usage

obj = DerivedClass.new()

obj.method()

print(obj.member_var)