I believe this is what clj-tuple is doing under the hood with macros.

On Aug 26, 2013, at 10:38 AM, Kevin Downey <redc...@gmail.com> wrote:

> A Tuple protocol that defines get0 get1 get3 etc for fast element access
> that doesn't tie you to using field names might be a good idea.
> 
> On 8/25/13 9:35 AM, Zach Tellman wrote:
>> I don't think so, even the existence of all the Tuple* types are an 
>> implementation detail, and you'd need to hint it as the right one to get 
>> sane performance.  (nth t n) has good performance, you should prefer that.
>> 
>> On Saturday, August 24, 2013 8:15:40 PM UTC-7, Ben wrote:
>>> 
>>> Are the element names .e0, .e1 etc. considered part of the public 
>>> interface of tuple objects?
>>> 
>>> 
>>> On Sat, Aug 24, 2013 at 7:38 PM, Zach Tellman 
>>> <ztel...@gmail.com<javascript:>
>>>> wrote:
>>> 
>>>> I just pulled some code I wrote while trying to optimize 'memoize' into 
>>>> its own library: https://github.com/ztellman/clj-tuple.  It only has the 
>>>> one function, so I assume no one will need too much explanation.  However, 
>>>> there may still be room for performance improvements, so if anyone wants 
>>>> to 
>>>> take a stab, pull requests are welcome.
>>>> 
>>>> Zach
>>>> 
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>>> 
>>> 
>>> 
>>> -- 
>>> Ben Wolfson
>>> "Human kind has used its intelligence to vary the flavour of drinks, which 
>>> may be sweet, aromatic, fermented or spirit-based. ... Family and social 
>>> life also offer numerous other occasions to consume drinks for pleasure." 
>>> [Larousse, "Drink" entry]
> 
> 
> -- 
> And what is good, Phaedrus,
> And what is not good—
> Need we ask anyone to tell us these things?
> 

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