From: David Vallner <david@...>
Date: 2006-04-11T10:38:57+09:00
Subject: Re: Class Definition inside a method definition?

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D=C5=88a Utorok 11. Apr=C3=ADl 2006 02:39 Bihal nap=C3=ADsal:
> Thanks David. I'm not sure you caught sight of the line of code I was
> worried about. I should have made it more clear. This one in particular
>
> sclass =3D class << self; self; end
>
> does use a class keyword and syntactic construct, it's just on a single
> line.
>
> Bihal

Well, "class << self" isn't really a class definition, it's a change of sco=
pe=20
into an object's singleton class. It just looks a real awful lot like one ;=
P=20
Which might, or might not exist at the time, and in the latter case it=20
indeeds starts to exist. I'm also possibly very wrong, but I've been able t=
o=20
live with understanding this that way ;P

Also, Pickaxe seems mildly wrong about the instance method definition bit:

irb(main):001:0> class Foo
irb(main):002:1>   def bar
irb(main):003:2>     def quux
irb(main):004:3>       puts "Foo#quux"
irb(main):005:3>     end
irb(main):006:2>   end
irb(main):007:1> end
=3D> nil
irb(main):008:0> foo =3D Foo.new
=3D> #<Foo:0xb7caf8c8>
irb(main):009:0> foo.quux
NoMethodError: undefined method `quux' for #<Foo:0xb7caf8c8>
        from (irb):9
        from :0
irb(main):010:0> foo.bar
=3D> nil
irb(main):011:0> foo.quux
=46oo#quux
=3D> nil
irb(main):012:0> Foo.new.quux
=46oo#quux
=3D> nil

Is that 1st ed. or 2nd ed. you're quoting? Might have changed between Ruby =
1.6=20
and 1.8.

David Vallner

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