Multiple Dynamic Array

[Bill Baxter]

Jarrett Billingsley wrote:
> "Bill Baxter" <dnewsgroup at billbaxter.com> wrote in message 
> news:empvht$9vk$1 at digitaldaemon.com...
> 
>> Jarrett, is that equivalent to doing the nested loop allocations above? Or 
>> does it allocate one contiguous chunk and then set the pointers to point 
>> inside of that?  Just curious, because if you're allocating a huge amount 
>> of memory that way, then you don't always want it to be contiguous, 
>> because there may not be a single block of memory available that's big 
>> enough.
> 
> The new int[][][](64, 64, 64) syntax calls _d_newm, which is defined in 
> dmd/src/phobos/internal/gc/gc.d.  It allocates several smaller blocks -- one 
> for each dimension and for each element, and sets up the pointers/lengths 
> for you. 

Thanks.  Yeh, I guess that behavior makes the most sense, since given an 
arbitrary int[][][] foo  one would expect to be able to do things like 
change foo[0].length and actually have memory freed.  That would be 
difficult if everything were all allocated as one block.

--bb