New adapter: std.allocator.quantizer

[Andrei Alexandrescu via Digitalmars-d]

On 5/11/15 11:06 AM, Timon Gehr wrote:
> - If the rounding function is not piecewise constant with one fixed
> point per piece, it can happen that 'allocated >= needed' but 'allocated
> < goodAllocSize(needed)'. Then, the allocated size will be inconsistent
> with goodAllocSize. (This is why I recommended to require the rounding
> function to have this property, which is stronger than monotonicity.)

Got it. That's a rather subtle requirement, so I changed the code to 
keep things simple for the user:

https://github.com/andralex/phobos/commit/9307b9f8969b7bfd0906e0441a13cbbded7f8418

> - If b.ptr is null, then line 113 is bad in case goodAllocSize(0) > 0.

That should be fixed in the same commit; I just handle expansion of null 
blocks up front in expand().


Thanks,

Andrei