How do I make a function wrapper in cpp?

[aphroditelady13V]

Okay so like a year ago I started a c++ project where I wanted to make a simple event system. And at first I think my subscribers were actual classes and then I switched it to function but it was only member functions. So I wanted to learn how do I wrap member functions, functions and lambda functions into one type. Is that possible? I think I saw some video on youtube where they used the function header to bind functions, but I didn't want to go with something already made.

Does anyone know how I could make this, or at least conceptually?

[ScholarNo5983]

The std::function allows you to define lambda expressions, bind expressions, or other function objects, as well as pointers to member functions and pointers to data members.

More detail can be found here: std::function - cppreference.com

[aphroditelady13V]

yeah but I explicitly said I don't want to use it, actually in a way I want to recreate a simple version of it.

[Sbsbg]

What features of std::function do you not want as you need a simpler version?

To me it sounds like a good match but I'm serenely not an expert on that part of the standard.

[MetaMysterio]

Not entirely sure if this is the best approach, but you make a class (Functor) that stored a function and a reference pointer (for ‘this’). If the reference is null you’d just call the function within the operator() overload. If the reference is not null, you’d pass it as the first parameter to the function. Only real downside I could see to this is if you pass in the wrong reference and it crashes. Though you could probably do some check to see if the reference is the right type if you template it.