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comp.lang.ruby

Re: Help with object scope

List Recv

12/21/2005 2:23:00 PM

I see.

So,
1) How do I call C from class TestM without explicitly using its
namespace (M:C)? Is there no way? I don't want to modify Kernel or
anything, just have class C available.

2) Could you explain exactly what a Module is? A namespace? A set of
methods without a home? I'm really confused... (I know that
module_define and class_define are synonomous, which is even more
confusing...)


Daniel Sheppard wrote:
> module M
> class C
> def self.blah
> end
> end
> end
>
> module M2
> include M
> class TestM
> def setup; C.blah; end
> end
> end
>
> Won't work because the C tries to refer to TestM::C, which doesn't
> exist.
>
> Previously, when you did an "include M" you included the module into
> Kernel.
>
> Since:
> TestM is an instance of Class
> Class is an instance of Object
> You've included M in Object, causing Object::C to be created
>
> So, in that case TestM::C exists.
>
>> I had a file, in short:
>> end
>>
>> Works great.
>>
>> *However*, if I wrap the unit tests in their own module, then
>> ruby can
>> no longer find class C. Why? Didn't I include module M? I'm really
>> confused here.
>>
>> If you want the full source, I can post it.
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3 Answers

Tim Hunter

12/21/2005 2:43:00 PM

0

List Recv wrote:
> 2) Could you explain exactly what a Module is? A namespace? A set of
> methods without a home? I'm really confused... (I know that
> module_define and class_define are synonomous, which is even more
> confusing...)

A little bit of both, actually. Here's a good description of what a
Module is: http://www.rubycentral.com/book/tut_mo...

Florian Groß

12/21/2005 3:24:00 PM

0

List Recv

12/22/2005 4:47:00 AM

0

> Try this instead:
>
>> class TestM
>> include M
>> def setup; C.blah; end
>> end

I see.

So, that's the equivalent of:

class TestM
class C; ... ; end
def setup; C.blah ; end
end

What exactly does it mean to nest a class?
I know that you cannot define a class within a method (not sure why)?

Also, is require the same thing as "copy and paste dynamically", or does
it drop down to the global namespace, or do something else?

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