Re: [boost] boost::aligned_storage broken on VC12 for alignment values of 8

Subject: Re: [boost] boost::aligned_storage broken on VC12 for alignment values of 8
From: John Maddock (boost.regex_at_[hidden])
Date: 2014-04-24 13:34:33

>> BTW this is true also of std::aligned_storage which also fails the final
>> assert above.  If instead we had:
>>
>> typedef __declspec(align(8)) struct some_struct_type align_t;
>>
>> Then the asserts all pass, but now align_t can not be passed through a
>> function call by value.  In fact this was a previous bug in the type traits
>> lib: http://article.gmane.org/gmane.comp.lib.boost.devel/173011
>>
>> So we're basically screwed whatever we do.
>>
>
> *Nod*, I discovered shortly after that std::aligned_storage in VC was
> similarly affected. Whle I expected __declspec(align(N)) to be at
> least reliable (after a light test) that also is disappointgly not the
> case for the reasons you've indicated.

I've just updated the type_traits docs to reflect these issues.

Cheers, John.