On Sunday, 11 August 2019 at 16:05:20 UTC, John Colvin wrote:
I'm trying to narrow down exactly what patterns work with each and how they overlap.

What I was trying to get at with the abstract method thing is that

abstract class C
    void foo();

is an abstract class with a non-abstract method, whose implementation is going to come from somewhere else (not a common pattern in D).

class C
    abstract void foo();

is an abstract class with an abstract method foo, which means you have to override it in a inheriting class to get a non-abstract class.

As I see this, everything you wrote is correct. :)

But you compared abstractness with interface usage, initially. So... I would say, interfaces are more like the abstract method case without any function body. But then, you will have to use "override" all across the inherited classes.

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