Exceptions for invalid use - review and extensions #106
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This change saves us 8 bits in the ErrorOr<TValue> struct which leads to less execution time when an instance is copied by value. As the struct is now properly encapsulated from a Design by Contract point of view, I simply choose _errors being null as the indicator for errors not being present. Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
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Instead of instantiating a new list every time ErrorsOrEmptyList is called with no errors being present, I reused a cached empty list. I also removed the unnecessary null-forgiving operators (the compiler uses the MemberNotNullWhenAttribute on IsError to verify that we checked for null beforehand). Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
The Value property is now properly encapsulated. When errors are present, the property getter will throw, similar to other properties like Errors or FirstError. Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
When clients have <Nullable> turned off, the C# compiler won't hint that null shouldn't be passed as the errors array/list. By explicitly checking for null, we eliminate these error cases. Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
… passed Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
Signed-off-by: Kenny Pflug <kenny.pflug@live.de>
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I'm lucky to get your help on this. Thanks! |
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Hey Amichai,
I reviewed your exception PR and would suggest the following changes:
IsErroris now a computed property. This removes 8 bits for the boolean value from the struct which leads to less execution time when copying by value. The sole indicator is now_errorsbeing null.ErrorsOrEmptyList. This prevents allocating a new list on every property call where no errors are present.Valueproperty will now throw anInvalidOperationExceptionwhen errors are present. This behavior is now in line with the behavior of theErrorsorFirstErrorproperty.InvalidOperationExceptionthrown in the implicit conversion methods to anArgumentException- this is the usual exception that callers would expect when invalid parameters are passed in.ToErrorOrextension method for error arrays - we did not have this one beforehand, only for lists.ErrorOr<TValue>. The C# compiler will comprehend that a field is not null according to theMemberNotNullWhenAttributeinstances applied toIsError.Feel free to cherry-pick these features as you see fit.