TempAlloc: an unusual request

[Andrei Alexandrescu]

On 6/20/11 8:57 PM, dsimcha wrote:
> On 6/20/2011 11:04 AM, Andrei Alexandrescu wrote:
>> On 6/20/11 10:02 AM, dsimcha wrote:
>>> == Quote from Andrei Alexandrescu (SeeWebsiteForEmail at erdani.org)'s
>>> article
>>>> On 6/19/11 6:20 PM, dsimcha wrote:
>>>>> My other concern is that giving RegionAllocator reference semantics
>>>>> would, IIUC, require an allocation to allocate a RegionAllocator.
>>>>> Since
>>>>> TempAlloc is designed to avoid global GC locks/world stopping like the
>>>>> plauge, this is obviously bad.
>>>> I am hoping we can arrange things such that a RegionAllocator created
>>>> from scratch initializes a new frame, whereas subsequent copies of it
>>>> use that same frame. Would that work?
>>>> Andrei
>>>
>>> No. I don't want every creation of a new frame to require a GC heap
>>> allocation.
>>
>> I don't understand why such would be necessary.
>>
>> Andrei
>
> Maybe I'm missing something, but how else would a RegionAllocator have
> reference semantics?

I'm thinking along the lines of an Algebraic containing the actual state 
and a pointer to the original object.

Andrei