turbolift.io.EffectfulVar
See theEffectfulVar companion object
sealed trait EffectfulVar[A, U <: IO] extends Get[A, U], Put[A, U]
Variable writable once.
Similar to OnceVar. Starts as empty. Any get operation blocks until put happens.
Unlike OnceVar, EffectfulVar stores effectful value: see Zipper.
Stored effects U are absorbed by the first fiber that performs get operation. Subsequent fibers that perform gets only receive pure A value, or Broken effect if none exists.
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