sealed trait ZState[S] extends AnyRef
ZState[S]
models a value of type S
that can be read from and written to
during the execution of an effect. The idiomatic way to work with ZState
is
as part of the environment using operators defined on ZIO
. For example:
final case class MyState(counter: Int) for { _ <- ZIO.updateState[MyState](state => state.copy(counter = state.counter + 1)) count <- ZIO.getStateWith[MyState](_.counter) } yield count
Because ZState
is typically used as part of the environment, it is
recommended to define your own state type S
such as MyState
above rather
than using a type such as Int
to avoid the risk of ambiguity.
To run a stateful workflow, use the ZIO.stateful
operator to allocate the
initial state.
Linear Supertypes
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Abstract Value Members
- abstract def get(implicit trace: ZTraceElement): UIO[S]
Gets the current state.
- abstract def set(s: S)(implicit trace: ZTraceElement): UIO[Unit]
Sets the state to the specified value.
- abstract def update(f: (S) => S)(implicit trace: ZTraceElement): UIO[Unit]
Updates the state with the specified function.
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