How to allow multiple actors with different state types?

Nixes / iotHubLib

a library for the esp8266 arduino platform that allows easy writing of sensor node programs for the iotHub platform

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How to allow multiple actors with different state types? #13

Closed Nixes closed 7 years ago

Nixes commented 7 years ago

Some ideas so far:

Have a separate array for each type of actor struct and have an actor struct for each type,
Have the state actually be a json object and the callback function decides what to do with it.
Do some crazy templating so we can determine type at compile time (but this would allow only actors of the same type)

Nixes commented 7 years ago

std::variant is perfect but only supported in c++17. So arduino compiler support will take a few years. For now I think I'll have to use something like a tagged union http://en.cppreference.com/w/cpp/language/union

Nixes commented 7 years ago

Ended up with a tagged union, works great!