Re: plugin calling code in main app

Hi,

side note:

> --
> Please read https://www.wxwidgets.org/support/mlhowto.htm before posting.

This reference is dead.



On Sat, Feb 14, 2026 at 09:02:57AM +0100, 'Alessandro Bettarini' via wx-users wrote:
> I need some help figuring out how a plugin can call code from classes
> defined in the main app

This topically seems to be a layer / scope concern.

I'd say that this is a producer consumer activity.

A main app (*any* main app!! Not "the" main app -
one might easily end up with *several*...) is supposed to
be able to
properly *consume* a wholesale component [functionality] (as provided by
a library).

Thus, it simply is the library scope's job to
specify *what exactly* it expects (read: all requirements)
any consumer to *provide* for it to be able to
function properly (read: fulfill its [scope-limited] purpose).

IOW, proper interfacing (and scoping).




Thus, one will need to
create a proper[ly minimalist!] interface type definition.

That interface[-based object] will then be *parameterized into*
a library-side component (type, factory, or so) [instantiation].

And that interface def obviously will have to be
*implemented* (derived) by the main app scope, simply in order to
actually *have* something to pass (show!) to
the *required* parameterization specialties of
the library component scope. :)




That's at least how I see it
(but I might be off vs.
some special recommendations in various articles,
especially how to handle interfaces *)).

*) e.g.:
"Inject functions, not interfaces"
  https://www.hacklewayne.com/inject-functions-not-interfaces




- DI (Dependency Injection)
- DIP (Dependency Inversion Principle)
- ISP (Interface Separation Principle)



Another topically related very good article:
"Composition Root"
  https://blog.ploeh.dk/2011/07/28/CompositionRoot/



> I have created a mockup project
> 
>   https://bitbucket.org/bettar/mockup/src/origin/

  "Conventions

    Singletons"

Singletons are an anti-pattern. See e.g.:
- "Why Singleton is an Anti-Pattern?"
    https://buraaktasci.medium.com/why-singleton-is-an-anti-pattern-f828c186bd3e
- "Why Singletons are Evil"
    https://learn.microsoft.com/en-us/archive/blogs/scottdensmore/why-singletons-are-evil
- "Retiring the Singleton Pattern - Peter Muldoon - Meeting C++ 2019"
    https://www.reddit.com/r/cpp/comments/f6vwna/comment/fi7o7jv/


> to show how far I got. Please clone the git repository and suggest the
> proper way for the plugin to use code (C++ classes) defined in the main app.

I only quickly mentioned a couple thoughts here, sorry ;-)


Greetings

Andreas Mohr

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