How do I tell the difference between a class C and the singletonclass of an instance of C

[deanwampler]

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Suppose that:

class C; end
c = C.new
sing = (class << c; self; end)

If a method is called with C and sing, but I don't know which is first and
which is second in the parameter list, how do I tell them apart?

Thanks,
dean

--
Dean Wampler
http://www.objectmentor.com
http://www.aspectprogramming.com
http://aquarium.rubyforge.org
http://www.contract4j.org

 

[deanwampler]

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I just figured out a way, if I also have the instance "c".

c.instance_of?(C) # => true
c.instance_of?(sing) # => false

Also works for kind_of? and is_a?

Thanks, Dean!

Suppose that:

class C; end
c = C.new
sing = (class << c; self; end)

If a method is called with C and sing, but I don't know which is first and
which is second in the parameter list, how do I tell them apart?

Thanks,
dean

--
Dean Wampler
http://www.objectmentor.com
http://www.aspectprogramming.com
http://aquarium.rubyforge.org
http://www.contract4j.org

--
Dean Wampler
http://www.objectmentor.com
http://www.aspectprogramming.com
http://aquarium.rubyforge.org
http://www.contract4j.org

 

[ysantoso-rubytalk]

Suppose that:

class C; end
c = C.new
sing = (class << c; self; end)

If a method is called with C and sing, but I don't know which is first and
which is second in the parameter list, how do I tell them apart?

C.name ==> "C"
sing.name ==> ""

YS

 

[deanwampler]

Note: parts of this message were removed by the gateway to make it a legal Usenet post.

Thanks.

Correction: only instance_of? works. is_a? and kind_a? both return true for
"C" and "sing".

C.name ==> "C"
sing.name ==> ""

YS

--
Dean Wampler
http://www.objectmentor.com
http://www.aspectprogramming.com
http://aquarium.rubyforge.org
http://www.contract4j.org