Can you add more support for when_all, when_any, when_seq and fail?

[libaineu2004]

Can you add more support for when_all, when_any, when_seq and fail?
Similar to this open source project:
https://github.com/Naios/continuable
https://naios.github.io/continuable/

[Amanieu]

I am not developing this library any more. Anyone can feel free to fork it if they want to continue maintaining it.

[zerodefect]

@Amanieu , can I ask why? You have a good library, so I'm curious if you have replaced it with something better (this would be of interest to me), or if you no longer have a need for this code.

[Amanieu]

I am now primarily writing Rust instead of C++.