Managed(?) thread-local storage

[cuviper]

Sounds similar to this idea:

Idea: "Ambient data"/"Current execution context"/ Was: Provide a thread-local scope with hooks for `std­։։­thread­։։­spawn`

Sometimes it’s necessary to implement a form of “implicit context” to pass a data too cumbersome to pass explicity everywhere. Eg. in slog there’s slog-scope that allows setting a “current logger”, for a duration of a function call. The called code can then retrieve and use that logger even deep down the call stack. It’s not really global variable, though it is implicitly passed around. Internally this is just implemented as thread-local Vector of objects. https://docs.rs/slog-scope/4.0.1/src/s…