Issue with creating event unsubscribe functions

[cosmic breach]

Code: https://godbolt.org/z/4c7WWeooa
The issue is described in the comments (line 80)

[coarse adder]

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[late ocean]

yeah, you can't do that

Honestly, the easy was would be to let you subscribers take an any instead of the concrete event type

Though, I'm leery of using std::any, there's probably a better way to do it but I'm not coming up with it off the top of my head

[cosmic breach]

yeah thats what I was doing initially but it looked odd for a function called onCursorMove to take an std::any when there's only one possibility to what the event can be

Hmm or maybe instead of a vector of functions, I store a vector of:cpp struct EventCallback { std::any fptr; std::function<std::any const&>; }; and compare func to std::any_cast<void(Class::*)(Event const&)>(callbac.fptr)

how does that sound?

[late ocean]

That may work, but honestly, I'd just store a void* to the function at that point

[cosmic breach]

Hmm yeah

[cosmic breach]

I went with the idea of using a parallel array that stores the typeid(funcptr).hash_code() for every callback
and to unsubscribe I iterate over that array to find the index of the hash_code, and assign m_listeners[index] = dormantCallbackFunction

[late ocean]

just as an fyi, the standard does not require that different types have different hash codes, only that type infos for the same type have the same hash code

it's very strongly suggested to be unique, but not required by standard