Wikipedia states that the color bit can be stored without taking
additional space: In many cases the additional bit of
information can be stored at no additional memory cost.
Looking at the Phobos implementation, it stores it as a regular
byte:
simendsjo:
But I would think this trick would break the GC,
If the tree manages its memory manually, using C heap memory,
then the pointer tagging becomes possible.
Bye,
bearophile
On Wednesday, 20 November 2013 at 08:48:33 UTC, simendsjo wrote:
But I would think this trick would break the GC, as well as
making code less portable.
Since the GC supports interior pointers, I think you can justify
using the least significant bits as long as the size and
alignment of the
safety0ff:
Since the GC supports interior pointers, I think you can
justify using the least significant bits as long as the size
and alignment of the pointed object guarantee that the pointer
+ tag will always lie inside the memory block.
From:
http://dlang.org/garbage.html
Do not take
On 11/20/2013 06:50 AM, bearophile wrote:
safety0ff:
Since the GC supports interior pointers, I think you can justify using
the least significant bits as long as the size and alignment of the
pointed object guarantee that the pointer + tag will always lie inside
the memory block.
From:
