[ownership] Convert ValueOwnershipKind to have an Invalid state instead of using optional. #34659
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…ad of using optional. At Andy's request. If it creates too much noise in covered switches, we may go back to the original.
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@swift-ci smoke test |
atrick
approved these changes
Nov 10, 2020
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Please get rid of the special-casing for Invalid. Otherwise this looks great.
Optional is appropriate when a particular API may fail. But here "Invalid" is actually an expected state, and normal state for constraints. It just means "any" or "unknown" ownership which happens to be invalid when applied to values because we have strict ownership rules for values.
| // If either lhs or rhs are invalid, return invalid. | ||
| if (lhsVal == ValueOwnershipKind::Invalid || | ||
| rhsVal == ValueOwnershipKind::Invalid) | ||
| return ValueOwnershipKind::Invalid; |
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You shouldn't be special-casing invalid here.
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Going to fix Andys comments in a follow up. |
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At Andy's request. If it creates too much noise in covered switches, we may go
back to the original.