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From: Hansi (hansipet_at_[hidden])
Date: 2008-02-02 12:01:15

I have looked now at this but I don't understand how to solve this
problem. maybe one can give me some example...then I will finish the

Best regards

David Abrahams schrieb:
> on Fri Feb 01 2008, Eric Niebler <> wrote:
>> Hansi Hansi wrote:
>>> I have looked another time to the implementation of the histogram. If
>>> we want to implement it in the same class density, than it is needed
>>> to provide default parameter for density_cache_size or min/max. Is it
>>> possible to ensure that either density_cache_size or min/max is
>>> provided as parameter? Sorry for the question but I'm not so familiar
>>> with parameters...
>> Yes, it's possible. IIRC, a parameter pack is a valid MPL sequence, so
>> you can us MPL algorithms to detect the presence or absence of any
>> parameter.
> boost::parameter::binding< argpack, tag::parametername, void >::type
> will tell you. If the result is void, the parameter wasn't supplied.

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