The first component is a question of how we can generalize and extend Rust enums to cover more scenarios. And of course I have to make sure not to read those fields without checking what kind of error I have first. I am going to start the series by focusing on the question of extending enums. Heck, you could just write a carefully constructed wrapper around a C union to get what you want.
In Rust, we have the notion of DST to address this problem. So I need dynamic allocation. One more structured solution is to go to a full-blown class hierarchy: In Rust, the size of an ErrorCode instance is equal to the maximum of its variants, which means that we can pass errors around by value and know that we have enough space to store any kind of error.
Rust really relies deeply on the flat, uniform layout for enums. I can make a struct, but it has these extra fields that are only sometimes relevant, which is awkward:
One more structured solution is to go to a full-blown class hierarchy: For example, perhaps instead of writing up my own little class hierarchy, I should be using boost::
Where Rust's enum shines May 5, One priority for Rust after 1. I can start out with a simple enum as before: In Scala, for example, creating a Some variant requires allocating an object.
For example, when I return UnexpectedChar, maybe I want to indicate what character I saw, and what characters I expected. One more structured solution is to go to a full-blown class hierarchy: So I need dynamic allocation.
Posted by: Arashitaur | on October 2, 2012
I can make a struct, but it has these extra fields that are only sometimes relevant, which is awkward: One more structured solution is to go to a full-blown class hierarchy: Where Rust's enum shines May 5, One priority for Rust after 1.
For example, when I return UnexpectedChar, maybe I want to indicate what character I saw, and what characters I expected. Preview of the next few posts OK, now that I spent a lot of time telling you why enums are great and subclassing is terrible, my next post is going to tell you why I think suclassing is sometimes fantastic and enums kind of annoying.
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