Recent questions tagged shapeless

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shapeless - What does `T {}` do in Scala

Browsing Shapeless code, I came across this seemingly extraneous {} here and here: trait Witness extends Serializable ... .com/questions/35903100/what-does-t-do-in-scala...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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shapeless - What does `T {}` do in Scala

Browsing Shapeless code, I came across this seemingly extraneous {} here and here: trait Witness extends Serializable ... .com/questions/35903100/what-does-t-do-in-scala...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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269 views

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shapeless - Using the "Prolog in Scala" to find available type class instances

Considering https://speakerdeck.com/folone/theres-a-prolog-in-your-scala, I would like to "abuse" the Scala ... using-the-prolog-in-scala-to-find-available-type-class-instances...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

230 views

1 answer

shapeless - Using the "Prolog in Scala" to find available type class instances

Considering https://speakerdeck.com/folone/theres-a-prolog-in-your-scala, I would like to "abuse" the Scala ... using-the-prolog-in-scala-to-find-available-type-class-instances...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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708 views

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shapeless - In scala 2.13, why sometimes TypeTags cannot be inferred? And how to construct one from a variable symbol?

Here is a simple example in shapeless: it("from Witness") { val ttg = implicitly[TypeTag[Witness.Lt[String]]] val ... could have caused this? And how do I circumvent this problem?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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