Hi list
I am kind of attached to strange code in that moment, it somehow shows
up on it’s own, I needed a singleton class and of course I had to
reinvent the wheel.
Actually, singletons do not always make sense, sometimes zerotons will
do the trick, so I created my zeroton
class << MyZero = Class::new( Whatever ) {
def a; 42 end
def new *args, &blk
self # or raise YourEyeBrows
end
}
and why not
module Kernel
def zeroton superclass = Object, &blk
returning( Class::new( superclass ) ) { |klass|
class << klass; self end.module_eval &blk
class << klass
def new *args, &blk
self
end
end
}
end
end
MyZero = zeroton( Whatever ) {
def a; 42 end
}
Any thoughts, insults (moderated though;) ?
Cheers
Robert
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)
On Nov 27, 3:48 am, Robert D. [email protected] wrote:
def new *args, &blk
self # or raise YourEyeBrows
end
}
end
^ missing
end
Cheers
Robert
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)
I’m probably just dense, but couldn’t you get the same thing with…
def zeroton(klass, &block)
klass.module_eval(&block) if block_given?; klass
end
Or…
module Kernel
def zeroton(klass, &block)
klass.module_eval(&block) if block_given?; klass
end
end
?
Regards,
Jordan
On Nov 27, 4:48 am, “Robert D.” [email protected] wrote:
def new *args, &blk
class << klass; self end.module_eval &blk
def a; 42 end
}
Any thoughts, insults (moderated though;) ?
Why are you using a class as if it were an instance?
What’s wrong with:
MyZero = Whatever.new
def what.a; 42; end
T.
On Nov 27, 8:17 am, Trans [email protected] wrote:
do the trick, so I created my zeroton
end
What’s wrong with:
MyZero = Whatever.new
def what.a; 42; end
T.
^ That was my thought too, but since he mentioned singleton, I thought
maybe he wanted a class object he could instantiate multiple times and
all of them would have whatever was in the block…like Whatever with
an anonymous mixin.
Regards,
Jordan
On Nov 27, 2007 3:17 PM, Trans [email protected] wrote:
do the trick, so I created my zeroton
end
What’s wrong with:
MyZero = Whatever.new
def what.a; 42; end
I guess you mean def MyZero.a
and indeed that is probably what I need.
At least in the usecase I was working on I will go for this simple
solution, thx Tom.
What I want is a class though, probably wrongly, now I have to figure
out why…
Cheers
Robert
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)
On Nov 27, 2007 3:35 PM, MonkeeSage [email protected] wrote:
reinvent the wheel.
end
maybe he wanted a class object he could instantiate multiple times and
all of them would have whatever was in the block…like Whatever with
an anonymous mixin.
Regards,
Jordan
I guess I know what I wanted now, I wanted to be able to use the
“Zeroton” with #new because it fits “better” into the model, I have
a Node which can have leaves or empty leaves (still working on ropes I
am helpless ;).
If I go for the easy implementation my code will look as follows
@left = EmptyNode
@right = RopeLeaf.new(…)
and when I go with the more complicated the code will look as follows
@left = EmptyNode.new
@right = RopeLeaf.new(…)
probably the second is missleading anyway and I will just create a
constant EmptyNode object.
I still want to group the method defs into a block though
(1)
X = returning(Object::new){ |o|
o.instance_eval{
def a; 42 end
}
}
(2)
def zeroton &blk
returning( Object::new ){ |o|
o.instance_eval &blk
}
end
X=zeroton {
def a; 42 end
}
(3) # quite normal, but …
X = Object.new
def X.a; 42 end
(4) # … I hate those loose def Something.a, they are a maintenance
nightmare
class << X = Object.new
def a; 42 end
end
I guess I have to give in for (3 or 4) I cannot come up with excuses
for being clever anymore.
Thx.
Robert
–
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)
On Nov 27, 2007 5:40 PM, MonkeeSage [email protected] wrote:
On Nov 27, 8:53 am, Robert D. [email protected] wrote:
I guess I have to give in for (3 or 4) I cannot come up with excuses
for being clever anymore.
I mainly stick to simple stuff. I’m not a metaprogramming genius like
a lot of the folks around here. I just confuse myself and break stuff,
heh. But I do find it fascinating the things you can do with it. _why
does some funky stuff that makes my socks unravel. And I did find your
code interesting. 
thx but the important lesson I learnt is to notice that indeed
metaprogramming was not needed
Cheers
Robert
–
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)
On Nov 27, 8:53 am, Robert D. [email protected] wrote:
I guess I have to give in for (3 or 4) I cannot come up with excuses
for being clever anymore.
I mainly stick to simple stuff. I’m not a metaprogramming genius like
a lot of the folks around here. I just confuse myself and break stuff,
heh. But I do find it fascinating the things you can do with it. _why
does some funky stuff that makes my socks unravel. And I did find your
code interesting.
Regards,
Jordan
On Nov 27, 2007, at 2:48 AM, Robert D. wrote:
I am kind of attached to strange code in that moment, it somehow shows
up on it’s own, I needed a singleton class and of course I had to
reinvent the wheel.
http://codeforpeople.com/lib/ruby/prototype/prototype-2.0.0/README
note that prototypes can be dup’d or clone’d
i think it might be what you are looking for?
cheers.
a @ http://codeforpeople.com/
On Nov 27, 9:40 am, “Robert D.” [email protected] wrote:
MyZero = Whatever.new
def what.a; 42; end
I guess you mean def MyZero.a
Yes.
You can def new on it:
def MyZero.new; self; end
What you want?
T.
I’m still thinking that class Whatever with a anonymous mixin (in the
form of a block) is the closest…
def zeroton(klass, &block)
klass.module_eval(&block) if block_given?; klass
end
Regards,
Jordan
On Nov 27, 2007 6:23 PM, Trans [email protected] wrote:
You can def new on it:
def MyZero.new; self; end
What you want?
As I stated above my initial approach was overkill and you made me
think that the zeroton would not necessarily need new defined;
my preferred solution up to now is the following
class << MyZero = Whatever.new
def a; 42 end
def new; self end # in case it is meaningful in the usecases
end
I took therefore your idea of creating a singleton object and
refraining from defining a method for doing this, the only
point where I adhere to my approach is the class << … end
notation as I dislike def X.something very much, it just does not seem
DRY enough.
Thx for your input again.
Robert
–
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)
On Nov 27, 2007 9:45 PM, MonkeeSage [email protected] wrote:
that is indeed very close to my final choice which is an inline expanded
def zeroton(object, &block)
class << self; self end.module_eval &block
object
end
<—>
class << X = “42”
def a; 43 end # ooops
end
the only reason why I shied away from class to non class objects is
the need to override #new in class objects.
By using Object::new or “42” as the receiver the intent of the
“zeroeness” becomes somehow clearer and I have to admit that I trust
Tom’s instinct a lot, (I am a sleek guy am I not;)
Cheers
Robert
–
http://ruby-smalltalk.blogspot.com/
All truth passes through three stages. First, it is ridiculed. Second,
it is violently opposed. Third, it is accepted as being self-evident.
Schopenhauer (attr.)