Re: [boost] [optional] memory use for optional refs and ptrs

Subject: Re: [boost] [optional] memory use for optional refs and ptrs
From: Rutger ter Borg (rutger_at_[hidden])
Date: 2010-10-15 07:28:15

On 2010-10-14 17:29, Larry Evans wrote:
>
> I think the most efficient storage would be in descending order of
> alignment values followed by the bits for the tags.  The reason for
> this is that a type with a smaller aligned value can be used to
> fill the padding for the previous type.  Since the bool tags
> have align==1, they could go last.

I looked into your results, nice. I think you're right.

> which shows 0 padding using this rule.  Of course, as shown by
> the output for bools_A_type, that's not the only way to get 0
> padding for a set of types.

I guess the reverse-ordering-rule is probably the simplest rule, and 
those are usually the best.

Cheers,

Rutger