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Asked: 2026-06-11T12:06:44+00:00

I have to create a factory method which can create objects from different libs.

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I have to create a factory method which can create objects from different libs. My directory tree looks like this:

libA/src/…
libB/src/…
libC/src/…
src/…

libA, libB, etc are compiled separated.

Let the factory class be in libA/src/Factory.h. It should create an object from libB/src/someclass.h.

If i include ../../libB/src/someclass.h in Factory.h, then libA cant compile, because it can’t find includes from someclass.h (The comiler looks for them in libA/src, but those are in libB/src) If i don’t include, it doesn’t know Someclass, so i can’t create an instance of it.

Is there any solution for this?

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1 Answer

  1. Editorial Team

    You’re looking for forward declaration: in headers where the class only needs to know the type, declare it with class AFactory; instead of including the whole Factory.h.

    See this tip for more info.

    EDIT

    Having re-read your question, I find a contradiction between the fact that you want libraries to be compiled separately, and that factory of libA must know class libB. You can’t compile separately then, so I would simply provide all necessary directories paths to include path.

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