Neat project: add pointer capability to std.bitmanip.bitfields

[Marc Schütz via Digitalmars-d]

On Wednesday, 2 December 2015 at 23:38:33 UTC, deadalnix wrote:
> On Wednesday, 2 December 2015 at 23:04:16 UTC, ZombineDev wrote:
>> On Wednesday, 2 December 2015 at 19:39:47 UTC, Andrei 
>> Alexandrescu wrote:
>>> Once done, this is a fantastic example of (a) the power of 
>>> generative programming, and (b) the advantages of using 
>>> library facilities instead of built-in features.
>>>
>>> https://issues.dlang.org/show_bug.cgi?id=15397
>>>
>>> Who would want to take it?
>>>
>>>
>>> Andrei
>>
>> So, something like 
>> http://dlang.org/phobos/std_bitmanip.html#.taggedPointer?
>
> Yeah, that'd be great if we could remove these scary warning 
> about the GC on these, this is only FUD. It works just fine 
> with the GC.

With the current GC, yes. If we allow this, any future GC 
implementation will have to expect pointers to be misaligned. If 
a GC is type aware, it can use this information to reject false 
pointers without having to look them up. Anyway, I guess that 
will not affect performance much, so it's probably ok.