Replacing AA's in druntime

[Steven Schveighoffer]

On Tue, 13 Mar 2012 22:39:25 -0400, Jakob Bornecrantz  
<wallbraker at gmail.com> wrote:

> On Wednesday, 14 March 2012 at 00:52:32 UTC, H. S. Teoh wrote:
>> Hi all,
>>
>> My AA implementation is slowly inching closer to being ready to replace  
>> aaA.d. So far I've been writing the implementation
>> outside of object_.d for ease of testing & development; now I'm
>> ready to start moving stuff into object_.d to start working on
>> integration with druntime.
>
> Hi,
>
> If I'm understanding this correctly you are moving the entire
> implementation of the AA into object.d and as such letting
> programs be purview to its inner working? In sort meaning you
> are making the entire AA implementation D ABI locked.
>
> This will make it impossible to either change the AA
> implementation in any ABI breaking fashion or make it impossible
> to pass AA's between libraries compiled against different
> versions of druntime.
>
> Is this what we really want?

This is unavoidable, whether it's a template or not.  What changes do you  
envision would be transparent using an opaque pImpl model (as was done in  
previous versions of phobos), but would break using templates?

-Steve