From: Uncutstone Wu <uncutstone@...>
Date: 2006-09-18T12:31:52+09:00
Subject: A idea about Ruby module, can we degrade a class to a module



To naturally represent following kind of relationship in Ruby code, I 
think, if we can degrade a class to a module, it will be posssible.

For example, we have a Person class, a Man class ,and a Teacher class. 
Man inherits from Person. And a Man object may also act as a teacher 
。Usually, we can implement this relationship as follows:

class Person
end

class Teacher
end

class Man < Person
	set_teacher(a_teacher)
		@teacher = a_teacher
	end
end

In this implementation, a Man object is a delegator to a Teacher object. 
To call Teacher methods from a Man object , we need lots of delegate 
method. It’s unconvenient.

But how about if Ruby provide a degradation mechanism, then we can 
degrade a class to a module, then we can include the degraded class into 
another class. The code will become as follows:

	class Person
	end

	class Teacher
	end

	degrade_to_module Teacher  # or something else,  this is imagined by me 
.

	class Man < Person
		include Teacher
	end

Or something like this

	class Person
	end

	class Teacher
	end

	degrade_to_module Teacher # or something else,  this is imagined by me 
.

	Class Man < Person
	End

	M = Man.new
	m.externd(Teacher)

Dose this make sense? Thanks.

Best regards

uncutstone

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