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From: Shunsuke Sogame (mb2act_at_[hidden])
Date: 2006-12-14 18:45:57

Joel de Guzman wrote:
> Shunsuke Sogame wrote:
>> Weapon Liu wrote:
>>> I think this is the right place to ask this question.
>>> As cool as boost::fusion is, there's still one question that bothers me,
>>> that is, if boost::fusion is the hammer, then what's the nail?
>>> I sure know that it's generic( more so than boost::tuple) and it's
>>> complete( with a bundle of algorithms and cool utilities), and it seems
>>> that it "solves" some problem quite well( when I read the documents).
>>> However, I found it bothering that the documents didn't even mention one
>>> real-world application( boost libs aside).
>>> Based on my experience, the most frequent scenarios where
>>> boost::tuple/fusion is useful are those where one needs a
>>> generated-on-the-fly struct for holding return values bundle, or where
>>> one needs to return multiple values transparently( well, nearly so),
>>> just like those lua does.
>> The fusion/tuple seems more generic?
>> Functional languages have curried and uncurried functions.
>> C++ is considered as a langauge that has "fused and unfused" functions?
>> void foo(int, int); // unfused
>> void foo(tuple<int,int>); // fused
>> Note that functional languages regard unfused one as "tupled"; conFusing :-)
>> Well, once an unfused function is converted to fused one,
>> it is unary.
>> Some kind of job will be easy; e.g. function composing.
> Kinda con-fusing :-) But once you get the essence, it really
> makes sense :P

FYI, here is 'compose' implementation using con-fusing.
It might be no practical use, though. :-)


Shunsuke Sogame

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