C++Now 2021

This talk will present techniques for overloading `any_invocable`.

`std::function` is an excellent tool for interface design. It encapsulates almost any object that is invocable the right way. `any_invocable` is an even better tool. It can encapsulate some types that `std::function` can't — the ones that are move-only. It can additionally call qualified overloads of the call operator on the underlying object. Unfortunately, it is still invocable in just one way. You get one list of argument types and that's what you must pass.

Wouldn't it be great if `any_invocable` could have as many overloads of `operator()` as you want? This talk will present techniques for implementing such a class template.