There's one thing that I often have to deal in embedded code — doing match
on a few bits from an I/O register, which is commonly u32:
let val : u32 = ...;
match (val & 0b11) >> 6 {
0b00 => ...,
0b01 => ...,
0b10 => ...,
_ => {}
}
You can clearly see two problems here: I need to provide a catch-all match,
even if the code guarantees a limited set of values; also I lost 0b11, and
there's no warning due to catch all.
Is it possible to make rustc aware of such cases?
What would be totally awesome is some kind of [] operator for ints, that
would extract bits, like that:
match val[6..7] { ... }
Is that something of interest to community? I would be willing to write an
RFC for that, and possibly extend the compiler.
--
Sincerely,
Vladimir "Farcaller" Pouzanov
http://farcaller.net/
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