ContObserver<F, A> class sealed

Receives the outcome of a Cont computation.

ContObserver is the callback container passed to ContRunWithExtension.runWith. It holds three outcome callbacks — onCrash, onElse, and onThen — at most one of which will be invoked: exactly one when the continuation completes, none when it never completes.

Use the copyUpdate* family of methods to derive observers with selectively overridden callbacks while preserving the rest of the original observer's state.

Implementers

• SafeObserver

Available extensions

• ContObserverElseNeverExtension
• ContObserverThenNeverExtension

Properties

hashCode → int

The hash code for this object.

no setter, inherited

onCrash → void Function(ContCrash crash)

Called when the computation terminates on the crash channel.

final

onElse → void Function(F error)

Called when the computation terminates on the else (error) channel.

final

onThen → void Function(A value)

Called when the computation succeeds on the then (value) channel.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

copyUpdate<F2, A2>({required void onCrash(ContCrash crash), required void onElse(F2 error), required void onThen(A2 value)}) → ContObserver<F2, A2>

Returns a copy of this observer with all three outcome callbacks replaced.

copyUpdateOnCrash(void onCrash(ContCrash crash)) → ContObserver<F, A>

Returns a copy of this observer with a replaced onCrash callback.

copyUpdateOnElse<F2>(void onElse(F2 error)) → ContObserver<F2, A>

Returns a copy of this observer with a replaced onElse callback and a new error type F2.

copyUpdateOnThen<A2>(void onThen(A2 value)) → ContObserver<F, A2>

Returns a copy of this observer with a replaced onThen callback and a new value type A2.

elseAbsurd<F>() → ContObserver<F, A>

Available on ContObserver<Never, A>, provided by the ContObserverElseNeverExtension extension

Returns a copy of this observer with the error type widened to F.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

thenAbsurd<A>() → ContObserver<F, A>

Available on ContObserver<F, Never>, provided by the ContObserverThenNeverExtension extension

Returns a copy of this observer with the success type widened to A.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited