DelegatingQueue<E> class Null safety

A Queue that delegates all operations to a base queue.

This class can be used to hide non-Queue methods of a queue object, or it can be extended to add extra functionality on top of an existing queue object.

Implemented types
Available Extensions

Constructors

DelegatingQueue(Queue<E> queue)
const

Properties

first → E
Returns the first element.
read-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
isEmpty → bool
Whether this collection has no elements.
read-onlyinherited
isNotEmpty → bool
Whether this collection has at least one element.
read-onlyinherited
iterator → Iterator<E>
Returns a new Iterator that allows iterating the elements of this Iterable.
read-onlyinherited
last → E
Returns the last element.
read-onlyinherited
length → int
Returns the number of elements in this.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
single → E
Checks that this iterable has only one element, and returns that element.
read-onlyinherited

Methods

add(E value) → void
Adds value at the end of the queue.
override
addAll(Iterable<E> iterable) → void
Adds all elements of iterable at the end of the queue. The length of the queue is extended by the length of iterable.
override
addFirst(E value) → void
Adds value at the beginning of the queue.
override
addLast(E value) → void
Adds value at the end of the queue.
override
any(bool test(E)) → bool
Checks whether any element of this iterable satisfies test.
inherited
cast<T>() → Queue<T>
Provides a view of this iterable as an iterable of R instances.
clear() → void
Removes all elements in the queue. The size of the queue becomes zero.
override
contains(Object? element) → bool
Whether the collection contains an element equal to element.
inherited
elementAt(int index) → E
Returns the indexth element.
inherited
every(bool test(E)) → bool
Checks whether every element of this iterable satisfies test.
inherited
expand<T>(Iterable<T> f(E)) → Iterable<T>
Expands each element of this Iterable into zero or more elements.
inherited
firstWhere(bool test(E), {E orElse()?}) → E
Returns the first element that satisfies the given predicate test.
inherited
fold<T>(T initialValue, T combine(T previousValue, E element)) → T
Reduces a collection to a single value by iteratively combining each element of the collection with an existing value
inherited
followedBy(Iterable<E> other) → Iterable<E>
Returns the lazy concatenation of this iterable and other.
inherited
forEach(void f(E)) → void
Invokes action on each element of this iterable in iteration order.
inherited
join([String separator = '']) → String
Converts each element to a String and concatenates the strings.
inherited
lastWhere(bool test(E), {E orElse()?}) → E
Returns the last element that satisfies the given predicate test.
inherited
map<T>(T f(E)) → Iterable<T>
The current elements of this iterable modified by toElement.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
reduce(E combine(E value, E element)) → E
Reduces a collection to a single value by iteratively combining elements of the collection using the provided function.
inherited
remove(Object? object) → bool
Removes a single instance of value from the queue.
override
removeFirst() → E
Removes and returns the first element of this queue.
override
removeLast() → E
Removes and returns the last element of the queue.
override
removeWhere(bool test(E)) → void
Removes all elements matched by test from the queue.
override
retainWhere(bool test(E)) → void
Removes all elements not matched by test from the queue.
override
retype<T>() → Queue<T>
Deprecated("Use cast instead")">@Deprecated("Use cast instead")
singleWhere(bool test(E), {E orElse()?}) → E
Returns the single element that satisfies test.
inherited
skip(int n) → Iterable<E>
Returns an Iterable that provides all but the first count elements.
inherited
skipWhile(bool test(E)) → Iterable<E>
Returns an Iterable that skips leading elements while test is satisfied.
inherited
take(int n) → Iterable<E>
Returns a lazy iterable of the count first elements of this iterable.
inherited
takeWhile(bool test(E)) → Iterable<E>
Returns a lazy iterable of the leading elements satisfying test.
inherited
toList({bool growable = true}) → List<E>
Creates a List containing the elements of this Iterable.
inherited
toSet() → Set<E>
Creates a Set containing the same elements as this iterable.
inherited
toString() → String
A string representation of this object.
inherited
where(bool test(E)) → Iterable<E>
Returns a new lazy Iterable with all elements that satisfy the predicate test.
inherited
whereType<T>() → Iterable<T>
Returns a new lazy Iterable with all elements that have type T.
inherited

Operators

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

Static Methods

typed<E>(Queue base) → Queue<E>
Creates a wrapper that asserts the types of values in base.
Deprecated('Use queue.cast<E> instead.')">@Deprecated('Use queue.cast<E> instead.')