Lazy<T extends Object> class

A class that provides lazy initialization for instances of type T.

Isolate sendability

A Lazy is sendable through SendPort iff:

  1. The _constructor is a top-level function or a static method (enforced by the @sendable lint at construction sites).
  2. The cached currentInstance, if present, holds a Sync outcome — Async outcomes wrap an isolate-local Future and are not sendable. A freshly-constructed Lazy whose singleton has not yet been read holds None and is unconditionally sendable.

Constructors

Lazy(@sendable LazyConstructor<T> _constructor)

Properties

currentInstance ↔ Option<Resolvable<T>>
Holds the current singleton instance of type T or null if no singleton instance was created.
getter/setter pair
factory → Resolvable<T>
Returns a new instance of T each time, acting as a factory.
no setter
hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
singleton → Resolvable<T>
Returns the singleton instance currentInstance, or creating it if necessary.
no setter

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
resetSingleton() → void
Resets the singleton instance, by setting currentInstance back to null allowing it to be re-created via singleton.
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited