Final by default?

[Don]

On Thursday, 13 March 2014 at 13:47:13 UTC, Steven Schveighoffer 
wrote:
> On Thu, 13 Mar 2014 09:37:51 -0400, Dicebot <public at dicebot.lv> 
> wrote:
>
>> On Thursday, 13 March 2014 at 13:16:54 UTC, Daniel Murphy 
>> wrote:
>>> "Steven Schveighoffer"  wrote in message 
>>> news:op.xcnu55j2eav7ka at stevens-macbook-pro.local...
>>>
>>>> > The worst breaking change in D2, by far, is the prevention
>>>> > > of
>>>> array stomping.
>>>>
>>>> What is your use case(s), might I ask? Prevention of array 
>>>> stomping, I thought, had a net positive effect on 
>>>> performance, because it no longer has to lock the GC for 
>>>> thread-local appends.
>>>
>>> I would guess they're setting length to zero and appending to 
>>> re-use the memory.
>>
>> Exactly. So far looks like upon transition to D2 almost all 
>> arrays used in our code will need to be replaced with some 
>> variation of Appender!T
>
> I think you might find that it will run considerably faster in 
> that case. In the old mechanism of D1, the GC lock was used on 
> every append, and if you had multiple threads appending 
> simultaneously, they were contending with the single element 
> cache to look up block info. Appender only needs to look up GC 
> block info when it needs more memory from the GC.

We don't use threads.