BinaryHeap as member

[balddenimhero]

On Monday, 13 November 2017 at 14:38:35 UTC, balddenimhero wrote:
> I need a priority queue of integers whose elements are not 
> ordered by the default `opCmp` but some delegate.
>
> The following gist illustrates the problem I'm having:
> https://run.dlang.io/gist/92876b2c4d8c77cdc68f1ca61e7e8e44?compiler=dmd
>
> The `Foo` class is supposed to wrap a binary heap (to be used 
> as priority queue) and order its contents according to 
> `o.isLess`. However I do not manage to initialise the according 
> member variable.
>
> Obviously, with the `h` member having type `BinaryHeap(int[], 
> "a<b")` and the constructor trying to assign a 
> `BinaryHeap!(int[], f)` the types do not quite match (line 18).
>
> Maybe I'm missing something obvious or approaching this in the 
> wrong way. Do you have any suggestions on how to achieve the 
> desired result?

In case it helps, here is the functionality I'm trying to port to 
D https://pastebin.com/CWAiEy40. I'm still struggling with 
properly defining the member in D though.