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[SR-13983] AdditiveArithmetic misleading text #56378

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dabrahams opened this issue Dec 22, 2020 · 2 comments
Closed

[SR-13983] AdditiveArithmetic misleading text #56378

dabrahams opened this issue Dec 22, 2020 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. conformances Feature → protocol: protocol conformances documentation standard library Area: Standard library umbrella

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@dabrahams
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Previous ID SR-13983
Radar rdar://problem/72592923
Original Reporter @dabrahams
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug, Documentation, ProtocolConformance
Assignee None
Priority Medium

md5: c04775d9a8673c0e65501d08f090f9cb

Issue Description:

Conforming to the AdditiveArithmetic Protocol

To add AdditiveArithmetic protocol conformance to your own custom type, implement the required operators, and provide a static zero property using a type that can represent the magnitude of any value of your custom type.

(emphasis mine). Not sure what the emphasized part is supposed to mean, but it certainly implies that the zero property has an associated type that can be different from Self, which could in fact be very useful but isn't supported. If we're gonna say something about zero here without changing the protocol it should be that it represents additive identity.
@typesanitizer
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Comment by Alex Martini (JIRA)

Fixed in 0b9ae84.

#36709

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. conformances Feature → protocol: protocol conformances documentation standard library Area: Standard library umbrella
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