Re: How do I check if a type is assignable to null at compile time?

[Jack via Digitalmars-d-learn]

On Saturday, 27 February 2021 at 01:23:06 UTC, H. S. Teoh wrote:
On Sat, Feb 27, 2021 at 01:03:56AM +0000, Jack via 
Digitalmars-d-learn wrote:
On Friday, 26 February 2021 at 23:37:18 UTC, Murilo wrote:
> On Friday, 26 February 2021 at 05:25:14 UTC, Jack wrote:
> > I started with:
> > 
> > enum isAssignableNull(T) = is(T : Object) || isPointer(T);
> > 
> > but how do I cover all cases?
> 
> You can check if it's null with this `variable is null` and 
> you can test it with assert as in `assert(variable is null);`

I mean a give type T not variablee

Why not just:

        enum isAssignableNull(T) = is(typeof((T t){ t = null; }));

?


T

works too, thanks but I ended up using Nathan S. solution which 
is quite fine too:
 enum bool isAssignableNull(T) = is(typeof(null) : T);