Is there any way to customize absl::StatusCode ?

[kaiwk]

Hello,

absl::Status module has a bunch of pre-defined error code (enum class StatusCode) which is good, but what if user what their own error code?

Currently, my colleague are using raw_code() as a way to extend more error codes. It's hacky, I noticed that absl::Status will static_cast<StatusCode>(raw_code()), so it will cause UB if we defined a error code which int value is larger than 20 (out of the range of absl::StatusCode enum int value). I'd rather find a another way for it...

I also find the way of error handling absl::Status provides is very similar to Result<T, E> in Rust. You return a struct contains both return value and error information(if any). It's really a decent alternatives to exception, and I hope it's more extensible.