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: Vicente Botet (vicente.botet_at_[hidden])
Date: 2012-04-26 11:56:15

lcaminiti wrote
> 
> 
> 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?
> 

No, these traits are included in the reviewed Boost.Conversion. Even if the
review is pending I don't expect it to be accepted. 

I opted to have a file by std file containing specialization.

http://svn.boost.org/svn/boost/sandbox/conversion/boost/conversion/std/

Others are also needed for Boost

http://svn.boost.org/svn/boost/sandbox/conversion/boost/conversion/boost

HTH,
Vicente

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