T[new]

[Lionello Lunesu]

"Andrei Alexandrescu" <SeeWebsiteForEmail at erdani.org> wrote in message 
news:h5ndt0$1blj$1 at digitalmars.com...
> bearophile wrote:
>> Walter Bright:
>>> Under the hood, a T[new] will be a single pointer to a library defined 
>>> type. This library defined type will likely contain three properties:
>>
>> I have another question: are there some performance penalities in using 
>> such arrays for normal random access operations?
>
> One extra indirection, usually nearby.
>
> Andrei

If the size and capacity get added to the begining of the memory block 
containing the data, only an extra offset is needed. The compiler could emit 
"mov eax, [esi*4 + 8]" or something. Look ma, no extra indirection :)

In fact, this is what .NET does as well, if I'm not mistaken. But then, .NET 
always has an extra indirection because of the movable GC stuff, right?

L.