OnceCell, A cell which can be written to only once.
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
- OnceCell()
-
factory
- OnceCell.withValue(T val)
-
factory
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
get(
) → Option< T> - Gets the reference to the underlying value.
-
getOrInit(
T func()) → T -
Gets the contents of the cell, initializing it with
funcif the cell was empty.inherited -
getOrNull(
) → T? -
Gets the underlying value, returns null if the cell is empty
inherited
-
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.
inherited
-
isSet(
) → bool -
Returns true if the value has been set. Returns false otherwise.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
set(
T value) → Result< (), T> - Sets the contents of the cell to value.
-
setOrNull(
T value) → T? -
Sets the contents of the cell to value. Returns null if the value is already set.
inherited
-
take(
) → Option< T> - Takes the value out of this OnceCell, moving it back to an uninitialized state.
-
takeOrNull(
) → T? -
Takes the value out of this OnceCell, moving it back to an uninitialized state. Returns null if the cell is empty.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited