Expose functionality across DLL boundaries

[LazyKozy]

Hi All,
I have a question for developing a plugin.
I’d like to access some Engine classes from the plugin. But I got link errors, because I tried to access the classes without ENGINE_API macro.

https://docs.unrealengine.com/latest/INT/Programming/Modules/API/index.html

The API macros are mostly used on older code to allow newer modules to access it from their DLL. In newer bits of code, the API macros are used far less, instead setting up nice interface layers to expose functionality across DLL boundaries.

My question is, what is a “nice interface layers to expose functionality across DLL boundaries”?
Does somebody know detail about that?
Is this an available in the future?

Thank you for your help!

[fujimori.morson]

#9 kamrann said such like this.

That’s a bit misleading really. It’s true they’ve begun to use the latter approach more, but the bulk of the engine is still reliant on exporting symbols.
How do I add a module? Looking for a thorough, systematic and in-depth explanation. Long post - #9 by kamrann