NullableOnceCell<T> class

OnceCell, A cell which can be written to only once. OnceCell implementation that allows T to be null and does not use Option

Equality: Cells are equal if they have the same value or are not set.

Hash: Cells hash to their existing or the same if not set.

Implementers

• ConstNullableOnceCell
• OnceCell

Constructors

NullableOnceCell()

NullableOnceCell.constant(Object id)

const

factory

NullableOnceCell.withValue(T? _val)

Properties

hashCode → int

The hash code for this object.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

getOrInit(T func()) → T

Gets the contents of the cell, initializing it with func if the cell was empty.

getOrNull() → T?

Gets the underlying value, returns null if the cell is empty

getOrTryInit<E extends Object>(Result<T, E> f()) → Result<T, E>

Gets the contents of the cell, initializing it with f if the cell was empty. If the cell was empty and f failed, an error is returned.

isSet() → bool

Returns true if the value has been set. Returns false otherwise.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

setOrNull(T value) → T?

Sets the contents of the cell to value. Returns null if the value is already set.

takeOrNull() → T?

Takes the value out of this OnceCell, moving it back to an uninitialized state. Returns null if the cell is empty.

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override