From: Austin Ziegler <austin@...>
Date: 2002-10-16T11:50:33+09:00
Subject: instance_eval & attribute accessors

There appears to be some bizarre behaviour with instance_eval with a 
block. I'm using Andy & Dave's constructor block technique, and while 
I can do:

Mod::Klass::new {
     accessor = true
}

It doesn't work unless I do:

Mod::Klass::new {
    self.accessor = true
}

It doesn't matter whether this is:

    def accessor=(a)
        @accessor = a
    end

or

    attr_accessor :accessor

Note also that it doesn't matter if I do:

Mod::Klass::new {
    accessor=(true)
}

However, if I have a normal function:

Mod::Klass::new {
    init_accessor(true)
}

It works just fine.

Can anyone explain why; is this a limitation of instance_eval? Is 
there a way to make the first version work without using self? Why 
would using the assignment method or accessor be strange? I don't 
necessarily want to have people access the variable directly -- most 
of the variables have special assignment methods. So ... what's up?

-austin
-- Austin Ziegler, austin@halostatue.ca on 2002.10.15 at 22.28.29