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How do you implement an interface in C++ without an abstract class?

Ask Bjarne to add interfaces enough many times until he gives in.

On a more serious note, I’m not exactly sure what the best C++ practice is. I guess you just have to live with abstract classes if you really want interfaces.

An abstract class with no member variables serves the same purpose in C++.

The only problem is to ensure the entire team agrees to only use it like an interface and nothing else. But I guess that’s the only proper way to do it in C++, for now.

this seems like the only proper way to do anything in C++. it’s a language where there’s 5 ways to do 1 thing and 1 way to do 5 things.

That’s not really the job of the language, though. If they can’t read the design docs and source annotations, they don’t really have any business touching anything.

pelya
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I know at least three ways, one of them involves variadic macros.

You don’t even need to look that far, take any sufficiently aged library, like OpenGL.

It was rhetorical.

pelya
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Yet I still had an urge to explain an obvious thing. Because it’s C++, so everyhing goes. There are even tools to auto-generate C++ interfaces, because of course someone decided that C++ is inadequate and must be improved using some kind of poorly-documented ad-hoc extension language on top of C++.

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