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Subject: Re: [boost] [mpl] is there a or_seq like logical metafunction?
From: vicente.botet (vicente.botet_at_[hidden])
Date: 2009-02-12 12:52:44

----- Original Message -----
From: "Larry Evans" <cppljevans_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Thursday, February 12, 2009 6:22 PM
Subject: Re: [boost] [mpl] is there a or_seq like logical metafunction?

> On 02/10/09 13:21, Larry Evans wrote:
>> On 02/10/09 12:45, vicente.botet wrote:
> [snip]
>> > Oh! this is quite interesting. I will try it to see how it
>> > works. WHich implementation should perdorms better if any
>> > difference?
> [snip]
>> BTW, what about the while_ template mentioned in my other recent
>> post. It seems that would be most general, and it just uses template
>> recursion and eval_if. If simplified implementation *usually* means
>> faster execution, then maybe while_ would be fastest. I know the
>> non-variadic and_ uses recursion (as I mentioned in my reply to
>> David), so; I don't think that would be a disadvantage.
> [snip]
> In the vault, under "Template Metaprogramming", there's a profile,
> in, of the find_if method and the while_ method
> for implementing and_seq. The while_ method shows 100 fewer
> instantiations for a 3 element vector of nullary logical metafunctions.
> BTW, the profile was not put in the variadic_templates vault directory
> because I realized that while_ doesn't need to use the variadic
> template compiler.

excelent news.

Aleksey, do you think that it is worth to include them on Boost.MPL?

Thanks Larry,

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