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Code Issues 39 Activity

invalid enum cases

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liquidex 2023-10-11 22:42:33 +02:00
parent 8368e3f72e
commit feac7a5283
1 changed files with 14 additions and 0 deletions
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content/programming/opinions.tree
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@ -145,3 +145,17 @@
% id = "01HCD90XT34K9BREXAKA5FFP3M" % id = "01HCD90XT34K9BREXAKA5FFP3M"
- remember that you cannot do `&ref_cell.borrow().some_field` because that would - remember that you cannot do `&ref_cell.borrow().some_field` because that would
drop the temporary `Ref<'b, T>` guard after the expression ends drop the temporary `Ref<'b, T>` guard after the expression ends
% id = "01HCG7KTGGAFS07QYJXZG6WHJJ"
+ `None` or `Invalid` cases in enums are a bad idea
% id = "01HCG7KTGGHWTT1ME9GQ5VPFPR"
- by having them, you're forcing your users into an API that forces them to think about the
invalid case every time they read the value.
% id = "01HCG7KTGGBJRX5JGQTFD59P4W"
- you're repeating the million dollar mistake - `null`
% id = "01HCG7KTGGYQ8EQB97AMFJPWYK"
- instead, use an explicit `Option<T>` or `std::optional<T>` or `T?` or ... when you need
to represent a possibly-invalid case