react: return domain-specific errors#464
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petertseng merged 5 commits intoexercism:masterfrom Apr 4, 2018
petertseng:react-errs
Merged
react: return domain-specific errors#464petertseng merged 5 commits intoexercism:masterfrom petertseng:react-errs
petertseng merged 5 commits intoexercism:masterfrom
petertseng:react-errs
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petertseng
commented
Mar 16, 2018
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| #[derive(Debug, PartialEq)] | ||
| pub enum RemoveCallbackError { | ||
| NonexistentCell, |
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note: It apparently is the case that we never test the NonexistentCell case. That can be dealt with later.
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petertseng
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Mar 16, 2018
| // so that we don't perform an incorrect partial write. | ||
| if !dependencies.iter().all(|&id| id < self.cells.len()) { | ||
| return Err("Nonexistent input"); | ||
| if let Some(&invalid) = dependencies.iter().find(|&dep| *dep >= self.cells.len()) { |
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There is in fact not a specific reason I wrote find(|&dep| *dep >= self.cells.len()) as opposed to one of these two alternatives:
find(|&&dep| dep >= self.cells.len())
find(|dep| **dep >= self.cells.len())
I really don't know what I'm doing and which is better, so I need help on that.
coriolinus
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Apr 4, 2018
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Last reviewed: ff451ea |
Instead of encouraging `()` as an Err type, we'd prefer to encourage informative errors. In this case, there is only one failure mode (so we do not need a separate error type) but there is a parameter (exactly which cell is invalid) so we'll keep Result to designate the invalid cell. As discussed in #444 A subtask of #462
Now that it's simplified to use Option, we can simply map into the `get_mut`.
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This merge was more involved. I'll ask for a re-review on this one to make sure I didn't screw anything up. |
petertseng
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coriolinus’s stale review
This merge was more involved. I'll ask for a re-review on this one to make sure I didn't screw anything up.
petertseng
commented
Apr 4, 2018
| let callback = reactor.add_callback(output, |v| cb1.callback_called(v)).unwrap(); | ||
| assert!(reactor.add_callback(output, |v| cb2.callback_called(v)).is_some()); | ||
| // We want the first remove to be Ok, but we don't care about the others. | ||
| // We want the first remove to be Ok, but the others should be errors. |
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coriolinus
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Apr 4, 2018
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This still looks correct to me.
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Thanks for that! |
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Closes #462.
Details are in individual commit messages.
I have no particular preference on whether the five commits comprising this PR should be squashed.