From: Robert Klemme <shortcutter@...>
Date: 2007-11-16T00:52:58+09:00
Subject: Re: Struct constructor

2007/11/15, Wayne Magor <Wayne.Magor@gmail.com>:
> It isn't possible to define a class method [] (to make a constructor)
> for a struct is it?
>
> If you have:
>
>      Customer = Struct.new( "Customer", :name, :address, :zip )
>      joe = Customer.new( "Joe Smith", "123 Maple, Anytown NC", 12345 )
>
> but you want it to be:
>
>      joe = ["Joe Smith", "123 Maple, Anytown NC", 12345]
>
> Ruby will just make joe an array, right?

Of course you cannot change the semantics of the array constructor.

>  No way around this that I
> can see, is there?

Of course there is, this is Ruby. :-)

irb(main):001:0> Test = Struct.new :foo, :bar do
irb(main):002:1* class <<self
irb(main):003:2> alias :initialize :[]
irb(main):004:2> end
irb(main):005:1> end
=> Test
irb(main):006:0> Test[1,2]
=> #<struct Test foo=1, bar=2>
irb(main):007:0>

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end