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lambda/shared/src/main/scala-3/feral/lambda/INothing.scala
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/* | ||
* Copyright 2021 Typelevel | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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package feral.lambda | ||
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import io.circe.Encoder | ||
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import scala.annotation.nowarn | ||
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/** | ||
* Alias for `Nothing` which works better with type inference. Inspired by fs2, but inlined here | ||
* to avoid pulling in an otherwise-unnecessary dependency. | ||
*/ | ||
type INothing <: Nothing | ||
object INothing { | ||
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/** | ||
* This can't actually be used. It's here because `IOLambda` demands an Encoder for its result | ||
* type, which should be `Nothing` when no output is desired. Userland code will return an | ||
* `Option[Nothing]` which is only inhabited by `None`, and the encoder is only used when the | ||
* userland code returns `Some`. | ||
*/ | ||
@nowarn("msg=dead code following this construct") | ||
implicit val nothingEncoder: Encoder[INothing] = (_: INothing) => ??? | ||
} |
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/* | ||
* Copyright 2021 Typelevel | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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package feral.lambda | ||
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type Lambda[F[_], Event, Result] = (Event, Context[F]) => F[Option[Result]] |