2 classes, same name

ruby-talk
1

did you know Ruby can have mutiple classes defined with the exact same
constant, yet they be different classes?

module X1
end

module X2
end

class XX
def XX.record(*mods)
x = XX.clone
x.class_eval { include *mods }
return x
end
def initialize
puts self.class.included_modules
puts self.class
puts
end
end

xx = XX.record(X1, X2).new
yy = XX.record(X1).new

···

–
tom sawyer, aka transami
transami@transami.net

2

did you know Ruby can have mutiple classes defined with the exact same
constant, yet they be different classes?

module X1
end

module X2
end

class XX
def XX.record(*mods)
x = XX.clone
x.class_eval { include *mods }
return x
end
def initialize
puts self.class.included_modules
puts self.class
puts self.class.id
puts
end
end

xx = XX.record(X1, X2).new
yy = XX.record(X1).new
puts “XX: #{XX.id}”

Errr, no?

batsman@tux-chan:/tmp$ ruby e.rb
X2
X1
Kernel
XX
538072192

X1
Kernel
XX
538071272

XX: 538072512

···

On Sat, Feb 01, 2003 at 09:39:26PM +0900, Tom Sawyer wrote:

–
_ _

__ __ | | ___ _ __ ___ __ _ _ __
'_ \ / | __/ __| '_ _ \ / ` | ’ \
) | (| | |__ \ | | | | | (| | | | |
.__/ _,|_|/| || ||_,|| |_|
Running Debian GNU/Linux Sid (unstable)
batsman dot geo at yahoo dot com

damn my office is cold.
need a hot secretary to warm it up.
– Seen on #Linux

3

yes there are three different classes. just that they all have identical
reponses from #class, which i thought was interesting.

···

On Saturday 01 February 2003 06:12 am, Mauricio Fernández wrote:

Errr, no?

batsman@tux-chan:/tmp$ ruby e.rb
X2
X1
Kernel
XX
538072192

X1
Kernel
XX
538071272

XX: 538072512

–
tom sawyer, aka transami
transami@transami.net

4

It’s not an identical response, but a Class value that is printed the same
way :slight_smile: It happens all the time in irb. Perhaps we should fix Class#inspect
and/or Class.to_s .

batsman@tux-chan:/tmp$ cat e.rb
module X1
end

module X2
end

class XX
def XX.record(*mods)
x = XX.clone
x.class_eval { include *mods }
return x
end
def initialize
puts self.class.included_modules
puts self.class
puts self.class.id
puts
end

def XX.inspect
“<Class XX: #{self.id.to_s}>”
end

def XX.to_s
“<Class XX: #{self.id.to_s}>”
end
end

xx = XX.record(X1, X2).new
yy = XX.record(X1).new

puts “XX: #{XX.id}”
batsman@tux-chan:/tmp$ ruby e.rb
X2
X1
Kernel
<Class XX: 538072072>
538072072

X1
Kernel
<Class XX: 538070822>
538070822

XX: 538072512

···

On Sat, Feb 01, 2003 at 11:06:00PM +0900, Tom Sawyer wrote:

On Saturday 01 February 2003 06:12 am, Mauricio Fernández wrote:

Errr, no?

batsman@tux-chan:/tmp$ ruby e.rb
X2
X1
Kernel
XX
538072192

X1
Kernel
XX
538071272

XX: 538072512

yes there are three different classes. just that they all have identical
reponses from #class, which i thought was interesting.

–
_ _

__ __ | | ___ _ __ ___ __ _ _ __
'_ \ / | __/ __| '_ _ \ / ` | ’ \
) | (| | |__ \ | | | | | (| | | | |
.__/ _,|_|/| || ||_,|| |_|
Running Debian GNU/Linux Sid (unstable)
batsman dot geo at yahoo dot com

Software is like sex; it’s better when it’s free.
– Linus Torvalds