From: James Edward Gray II <james@...>
Date: 2006-09-26T22:26:24+09:00
Subject: Re: constructor calls parent

On Sep 26, 2006, at 8:15 AM, David Corticchiato wrote:

> Hi
>
> I have a class witch inherit from another. I want that the child's
> constructor call the upper constructor before start his (sorry for my
> bad english).
>
> in C++ it would be :
> MyClass::MyClass(options) : upperClass(options){
>
> }
>
> I don't find how to write it in Ruby.

 >> class Parent
 >>   def initialize
 >>     puts "Parent#initialize called."
 >>   end
 >> end
=> nil
 >> class Child < Parent
 >>   def initialize
 >>     super # call Parent#initialize with our parameters
 >>     puts "Child#initialize called."
 >>   end
 >> end
=> nil
 >> Child.new
Parent#initialize called.
Child#initialize called.
=> #<Child:0x326444>

If you would rather pass no arguments to the parent, use super().  To  
control which arguments are passed use this form:  super(:passed,  
"arguments", 4, :parent).

Hope that helps.

James Edward Gray II