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• clocks.scala

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kyo.clocks.scala Maven / Gradle / Ivy

package kyo

import kyo._
import kyo.envs._
import kyo.ios._

import java.time.Instant
import java.time.ZoneId
import java.time.{Clock => JClock}
import kyo.locals.Locals

object clocks {

  abstract class Clock {
    def now: Instant > IOs
  }

  object Clock {
    val default: Clock =
      new Clock {
        val now = IOs(Instant.now())
      }
  }

  object Clocks {

    private val local = Locals.init(Clock.default)

    def let[T, S](c: Clock)(f: => T > (IOs with S)): T > (IOs with S) =
      local.let(c)(f)

    val now: Instant > IOs =
      local.get.map(_.now)
  }
}