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From "Bruno P. Kinoshita" <brunodepau...@yahoo.com.br>
Subject Re: [functor] CharacterRange, FloatRange, DoubleRange and open/closed intervals
Date Tue, 24 Jan 2012 21:10:35 GMT


Sounds great for me too :) 


Cheers,


Bruno P. Kinoshita
http://kinoshita.eti.br
http://tupilabs.com


----- Mensagem original -----
> De: Adrian Crum <adrian.crum@sandglass-software.com>
> Para: Commons Developers List <dev@commons.apache.org>
> Cc: 
> Enviadas: Terça-feira, 24 de Janeiro de 2012 18:30
> Assunto: Re: [functor] CharacterRange, FloatRange, DoubleRange and open/closed intervals
> 
> On 1/24/2012 8:15 PM, Matt Benson wrote:
>>  Thanks for your interest, Adrian!  Comments inline:
>> 
>>  On Tue, Jan 24, 2012 at 1:58 PM, Adrian Crum
>>  <adrian.crum@sandglass-software.com>  wrote:
>>>  On 1/24/2012 6:58 PM, Matt Benson wrote:
>>>>  IMO the difference between [lang]'s and [functor]'s range 
> concepts is that
>>>>  those in [lang] are intended to be able to say whether a given 
> value is in
>>>>  the Range, but, with the exception of CharRange (this class is not 
> even
>>>>  public), they make no provision for iterating over members of the 
> range. I
>>>>  would therefore design a [functor]-targeted Range builder API to 
> allow the
>>>>  user to specify how next values are obtained. Range may not even be 
> the best
>>>>  word to describe the behavior we are trying to model here, so 
> let's be open
>>>>  to reinterpretation as we proceed.
>>> 
>>>   From my perspective, Range + Step = Sequence.
>>  I'll buy that if noone else objects.  :)
>> 
>>>  A Range iterator would be
>>>  useful for implementing mathematical sets.
>>  e.g. integer range a..b step 3 yields the sequence of integers n
>>  greater than or equal to a and less than or equal to b where (n - a) %
>>  3 == 0 ?  Is this useful?
>> 
>>  Matt
> 
> It would be useful for a mathematician. Another possibility is a Range 
> of Dates, with a step of one hour, or one day or...
> 
> The Range class could accept an Iterator factory so various steps can be 
> implemented in client code.
> 
> -Adrian
> 
> 
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