[Understanding] Classes and delegate inheritance vs function pointers

[Steven Schveighoffer]

On 1/9/21 3:20 PM, Q. Schroll wrote:
> Yes. Actually, I need it for slices, but only pointer part of it really 
> mattered.
> 
> A Derived[] is implicitly a const(Base)[], not a Base[].
> A void delegate() @safe[] is implicitly a const(void delegate())[].
> But it seems a void function() @safe[] **isn't** implicitly a const(void 
> function())[].
> 
> Functions taking those are kind of useless like that.

It should work. The reason const works is under the theory that you 
cannot change it, so there is no danger of replacing the value with 
something that isn't the original type.

I would say as long as it's covariant (or contravariant? I can't 
remember), implicit casting to a const array should work.

-Steve