From: dblack@...
Date: 2006-07-14T06:15:23+09:00
Subject: Re: equivalent of attr_accessor for class variables?

Hi --

On Fri, 14 Jul 2006, ara.t.howard@noaa.gov wrote:

> On Fri, 14 Jul 2006, bwv549 wrote:
>
>> It is simple to set a class constant in ruby:
>>
>>  class Foo
>>    CLASS_CONSTANT = "never to change"
>>  end
>> 
>> And accessed like this:
>>  Foo::CLASS_CONSTANT
>> 
>> However, I'd like to be able to create a class variable that is easily
>> accessible (read/write) by outside users without having to write class
>> accessor methods.  How can I do this?
>> 
>> A really ugly way to set the variable without an accessor would be
>> this:
>>  class Foo; @@class_constant = "newvalue" end
>> but that is write only.
>> 
>> The syntax:
>>  Foo.class_constant = "newvalue"
>> would be preferable, but how to do this without writing accessor
>> methods?
>> 
>> Thanks
>
>  class C
>    class << self
>      attr_accessor 'class_constant'
>    end
>  end

That doesn't use class variables, though -- which is an asset, as far
as I'm concerned :-)  but doesn't exactly match the question.


David

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