arrow-fx-coroutines / arrow.fx.coroutines / Use / <init>

<init>

Use(acquire: suspend () -> A)

Marker for suspend () -> A to be marked as the Use action of a Resource. Offers a convenient DSL to use Resource for simple resources.

import arrow.fx.coroutines.*

class File(url: String) {
  suspend fun open(): File = this
  suspend fun close(): Unit {}
  override fun toString(): String = "This file contains some interesting content!"
}

suspend fun openFile(uri: String): File = File(uri).open()
suspend fun closeFile(file: File): Unit = file.close()
suspend fun fileToString(file: File): String = file.toString()

suspend fun main(): Unit {
  val res = resource {
    openFile("data.json")
  } release { file ->
    closeFile(file)
  } use { file ->
    fileToString(file)
  }

  println(res)
}