From: Dominik Honnef <dominikh@...>
Date: 2010-04-25T09:01:30+09:00
Subject: Re: Defining your own typecaster

On [Sun, 25.04.2010 08:37], Josh Cheek wrote:
> Hi, how do you define your own typecaster?
> 
> Builtin examples
> 
> Array(1..5)   # => [1, 2, 3, 4, 5]
> Integer(5.2)  # => 5
> Float(5)      # => 5.0
> 
> 
> I would expect it to be something like this
> 
> class Foo
>   def self.()(*objs)
>     Foo.new
>   end
> end
> 
> Foo(1)
> 
> 
> But that isn't valid syntax, and I'm not sure what to look up to figure this
> out.


They're actually just methods with an uppercase name.

class Foo
  …
end

def Foo(arg)
  Foo.new(…)
end

Foo(…) # => #<Foo:0x8ebc4b4>