Re: [boost] Re: New version of valunion and stack_allocator uploaded

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-03-01 16:46:32

I've implemented this scheme in boost/python/converter/from_python_data.hpp
now, and it works great! No more EDG-specific workarounds, and everything
compiles faster!

-Dave

----- Original Message -----
From: "David Abrahams" <david.abrahams_at_[hidden]>

> Thinking a little further, I think what we want is this:
>
> take the union of all types whose alignment is <= that of the target
> if the alignment is not a multiple of the target alignment,
>     take the union of all types whose size is <= that of the target
>     if the alignment is not a multiple of the target alignment,
>         take the union of all the types and cross fingers
> assert success.
>
> The intent of this approach is to find a minimally-aligned type which
> ensures alignment of the target while maintaining compatibility with
brian's
> basic strategy.
>
> It seems like anything more simple-minded will either over- or under-align
> in more cases. Over-alignment is wasteful, and under-alignment is
dangerous.
>
> -Dave