Re: [boost] static_vector using aligned_storage

Subject: Re: [boost] static_vector using aligned_storage
From: Gottlob Frege (gottlobfrege_at_[hidden])
Date: 2012-12-13 12:16:02

On Wed, Dec 12, 2012 at 7:30 PM, Marshall Clow <mclow.lists_at_[hidden]>wrote:

> On Dec 12, 2012, at 3:26 PM, Olaf van der Spek <ml_at_[hidden]> wrote:
>
> > On Wed, Dec 12, 2012 at 11:57 PM, Nevin Liber <nevin_at_[hidden]>
> wrote:
> >> Another possible solution is to fall back on an allocator if there isn't
> >> enough room in the embedded storage.  The signature would be something
> like
> >>
> >> static_vector<T, N, A = std::allocator<T>>
> >>
> >> And you could provide null_allocator_assert and null_allocator_throw as
> >> options (or make one of those the default), as it is now the
> responsibility
> >> of the allocator, not static_vector, to throw or not throw.
> >
> > That'd make it more like a hybrid_vector, but it's certainly a good idea.
> > It's like a string with a small string optimization.
>
> To me, that's a different container.
>
> -- Marshall
>

And in fact it *is* a different container.  Since the allocator is part of
the type, it is a different type. :-)  For once, having the allocator as
part of the type is a good thing.

I posit:

1. we want a hybrid "small string optimization" vector anyhow - I think it
would be useful in many places
2. thus assume we have hybrid_vector
3. would we then want static_vector to be different, or just a typedef of
hybrid_vector with a particular null_allocator?

Tony