Re: [boost] [type_traits] has_equal_to< std::vector<T> > always true_

Subject: Re: [boost] [type_traits] has_equal_to< std::vector<T> > always true_
From: lcaminiti (lorcaminiti_at_[hidden])
Date: 2012-04-26 10:43:28

Vicente Botet wrote
> 
> Le 25/04/12 20:17, Jeffrey Lee Hellrung, Jr. a écrit :
>> On Wed, Apr 25, 2012 at 10:28 AM, Vicente J. Botet Escriba<
>> vicente.botet@>  wrote:
>>
>>>
>>> Why do you need to specialize this trait for STL containers? Do you mean
>>> that has_equal_to doesn't work for them? if no why?
>>>
>>> Sorry if this is something obvious.
>>>
>> As far as I've gathered, typical STL implementations won't "guard" the
>> declaration of vector's operator== with something like Boost.EnableIf, so
>> vector<X>  is always reported as having an operator== regardless of what
>> X
>> is.
> Oh, I see now. I had the same issue while implementing is_assignable ;-)
> 

Is is_assignable part of some Boost library public API? Did you put the
specializations in a separate STL header or not?

Thanks.
--Lorenzo

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