What's the equality of lambdas? After reading the ...
# compileri
iseki
07/13/2023, 10:32 AMWhat's the equality of lambdas? After reading the languags specification, I found nothing about it.
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ephemient
07/13/2023, 10:57 AMcallable references have equality; otherwise unspecified
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iseki
07/13/2023, 10:59 AMI create an issue here: https://youtrack.jetbrains.com/issue/KT-60413/Why-not-specify-the-lambda-equality
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ephemient
07/13/2023, 11:01 AMwhy must it be specified? Java doesn't specify for its lambdas either
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iseki
07/13/2023, 11:01 AM@ephemient The official document give examples to use lambda as event handler. But in many case, the event handler need a specified equality definition.
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ephemient
07/13/2023, 11:02 AMit allows the possibility of optimizing instance creation of non-capturing lambdas
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iseki
07/13/2023, 11:03 AMI got it. Be honest I haven't noticed it before found the optimization.
iseki
07/13/2023, 11:05 AMMaybe let it be an undefined behaviour is more suitable than unspecified.
iseki
07/13/2023, 11:39 AMIf just for optimization, could we use annotation to hint the compiler that the lambda doesn't care equality?
iseki
07/13/2023, 3:02 PMThinking about it again, I think the reason might be Kotlin want to following Java lambda implementation in the future. But Java is unspecified now, so Kotlin also leave it unspecified.
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ephemient
07/13/2023, 7:24 PMKotlin is already using Java's LambdaMetaFactory in various cases
ephemient
07/13/2023, 7:26 PM4 Views