ConstNullableOnceCell<T> class

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

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.

Implemented types

Constructors

ConstNullableOnceCell(Object id)
const

Properties

hashCode → int
The hash code for this object.
no setteroverride
id → Object
Const objects all share the same canonicalization, meaning instantiation of the same class with the same arguments will be the same instance. Therefore, if you need multiple const versions, an id is needed.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

getOrInit(T func()) → T
Gets the contents of the cell, initializing it with func if the cell was empty.
override
getOrNull() → T?
Gets the underlying value, returns null if the cell is empty
override
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.
override
isSet() → bool
Returns true if the value has been set. Returns false otherwise.
override
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.
override
takeOrNull() → T?
Takes the value out of this OnceCell, moving it back to an uninitialized state. Returns null if the cell is empty.
override
toString() → String
A string representation of this object.
override

Operators

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