Hi Ian, all,
On Wed, Jan 18, 2023 at 6:56 PM Ian Lance Taylor <i...@golang.org> wrote:
> > // IsEmpty checks if the interface is equal to nil.
> > func IsEmpty[T Block](blk T) bool {
> > var empty T
> > return empty == blk
> > }
> >
> > (I had blk Block before, instead of blk T).
> >
> > Comparing with empty is something I've needed to do a bunch of times
> > and have been unable to do.
>
> The type argument to a function like IsEmpty is rarely an interface
> type. So the comparison in the instantiation IsEmpty is not comparing
> values of interface type. It's comparing values of whatever type
> IsEmpty is instantiated with. And it is possible to instantiate
> IsEmpty with types that can't be compared, even with their zero value,
> such as [1][]byte.
This makes sense, however, is there any way to compare against empty
in this context? I was wondering how to go about doing that.
Thanks,
Christian
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