From: Ezra Zygmuntowicz <ezmobius@...>
Date: 2006-06-10T06:47:13+09:00
Subject: Re: ... building my own end-fix statements.


On Jun 9, 2006, at 2:36 PM, Ezra Zygmuntowicz wrote:

>
> On Jun 9, 2006, at 1:44 PM, Jeff Wood wrote:
>
>> I believe it's possible to define my own end-fix qualifiers like "if"
>> and "unless" ...
>>
>> Can anybody provide code examples for defining such a construct in  
>> Ruby?
>>
>> For instance :
>>
>> x.doSomething() when x.ready?
>>
>> which would call x.ready? repeatedly until it returned a true then
>> would call x.doSomething()
>>
>> ... I know I could do
>>
>> while( not x.ready? )
>> sleep 0.5
>> wend
>>
>> x.doSomething()
>>
>> but I'd rather not.
>>
>> even a
>>
>> when( x.ready? ) { |result| x.doSomething() } would be fine I guess
>> ... but wouldn't work because x.ready? would be precalculated before
>> when gets to it... so it wouldn't ever change... I basically need to
>> be able to pass two blocks if I were to do this ...
>>
>> when( isReadyProc, bodyProc ) ... or something like that.
>>
>> Any ideas ???
>>
>> --jw.
>
>
> Hey Jeff-
>
> 	You can use until for this. Here is a contrived example:
>
> irb(main):001:0> class X
> irb(main):002:1>   def initialize
> irb(main):003:2>     @foo = 0
> irb(main):004:2>   end
> irb(main):005:1>   attr_reader :foo
> irb(main):006:1>   def increment
> irb(main):007:2>     @foo += 1
> irb(main):008:2>   end
> irb(main):009:1>
> irb(main):010:1*   def ready?
> irb(main):011:2>     @foo == 50
> irb(main):012:2>   end
> irb(main):013:1> end
> => nil
> irb(main):014:0>
> irb(main):015:0* x = X.new
> => #<X:0x337c6c @foo=0>
> irb(main):016:0> x.increment until x.ready?
> => nil
> irb(main):017:0> puts x.foo
> 50
>
>
> Cheers-
> -Ezra


	Actually I totally misread your question Jeff. Sorry ;)

-Ezra