Non-null objects, the Null Object pattern, and T.init

[Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>]

On Monday, 20 January 2014 at 12:20:58 UTC, Ola Fosheim Grøstad 
wrote:
> But when you have an explicit nullptr test you will have to 
> mask it before testing the zero-flag in the control register.

And just to make it explicit: you will have to add the masking 
logic to all comparisons of nullable pointers too if you want to 
allow comparison of null to be valid.

aptr==bptr => ((aptr&MASK==0)&&(bptr&MASK==0))||aptr==bptr

or something like that.