class LinkedQueue[A] extends Queue[A]

Provides a FIFO queue of generic items, supporting enqueue and dequeue operations, along with methods for peeking at the first item,

This implementation uses a singly-linked list. The enqueue, dequeue, peek, size, and isEmpty operations all take constant time in the worst case. Iteration takes time proportional to the number of items.

Adapted from the book Algorithms 4 by R. Sedgewick and K. Wayne.

See also

Section 1.3 of Algorithms, 4th Edition

Algorithms, 4th edition by Robert Sedgewick and Kevin Wayne, Addison-Wesley Professional, 2011, ISBN 0-321-57351-X. http://algs4.cs.princeton.edu

Linear Supertypes
Queue[A], Iterable[A], IterableLike[A, Iterable[A]], Equals, GenIterable[A], GenIterableLike[A, Iterable[A]], Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, Iterable], TraversableLike[A, Iterable[A]], GenTraversableLike[A, Iterable[A]], Parallelizable[A, ParIterable[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, Iterable[A]], HasNewBuilder[A, Iterable[A] @scala.annotation.unchecked.uncheckedVariance], AnyRef, Any
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  8. Traversable
  9. GenTraversable
  10. GenericTraversableTemplate
  11. TraversableLike
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Type Members

  1. type Self = Iterable[A]
    Attributes
    protected[this]
    Definition Classes
    TraversableLike
  2. class WithFilter extends FilterMonadic[A, Repr]
    Definition Classes
    TraversableLike

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike
  4. def ++:[B >: A, That](that: Traversable[B])(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike
  5. def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike
  6. def /:[B](z: B)(op: (B, A) ⇒ B): B
    Definition Classes
    TraversableOnce → GenTraversableOnce
  7. def :\[B](z: B)(op: (A, B) ⇒ B): B
    Definition Classes
    TraversableOnce → GenTraversableOnce
  8. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  9. def addString(b: StringBuilder): StringBuilder
    Definition Classes
    TraversableOnce
  10. def addString(b: StringBuilder, sep: String): StringBuilder
    Definition Classes
    TraversableOnce
  11. def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder
    Definition Classes
    TraversableOnce
  12. def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B
    Definition Classes
    TraversableOnce → GenTraversableOnce
  13. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  14. def canEqual(that: Any): Boolean
    Definition Classes
    IterableLike → Equals
  15. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  16. def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike
  17. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]
    Definition Classes
    TraversableOnce
  18. def companion: GenericCompanion[Iterable]
    Definition Classes
    Iterable → GenIterable → Traversable → GenTraversable → GenericTraversableTemplate
  19. def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit
    Definition Classes
    IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
  20. def copyToArray[B >: A](xs: Array[B]): Unit
    Definition Classes
    TraversableOnce → GenTraversableOnce
  21. def copyToArray[B >: A](xs: Array[B], start: Int): Unit
    Definition Classes
    TraversableOnce → GenTraversableOnce
  22. def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
    TraversableOnce
  23. def count(p: (A) ⇒ Boolean): Int
    Definition Classes
    TraversableOnce → GenTraversableOnce
  24. def dequeue(): A

    Removes and returns the item on this queue that was least recently added.

    Removes and returns the item on this queue that was least recently added.

    returns

    first item of this queue

    Definition Classes
    LinkedQueue → Queue
    Exceptions thrown

    NoSuchElementException if this queue is empty

  25. def drop(n: Int): Iterable[A]
    Definition Classes
    IterableLike → TraversableLike → GenTraversableLike
  26. def dropRight(n: Int): Iterable[A]
    Definition Classes
    IterableLike
  27. def dropWhile(p: (A) ⇒ Boolean): Iterable[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  28. def enqueue(item: A): Unit
    Definition Classes
    LinkedQueue → Queue
  29. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  30. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  31. def exists(p: (A) ⇒ Boolean): Boolean
    Definition Classes
    IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
  32. def filter(p: (A) ⇒ Boolean): Iterable[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  33. def filterNot(p: (A) ⇒ Boolean): Iterable[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  34. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  35. def find(p: (A) ⇒ Boolean): Option[A]
    Definition Classes
    IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
  36. def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike → FilterMonadic
  37. def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Iterable[B]
    Definition Classes
    GenericTraversableTemplate
  38. def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1
    Definition Classes
    TraversableOnce → GenTraversableOnce
  39. def foldLeft[B](z: B)(op: (B, A) ⇒ B): B
    Definition Classes
    TraversableOnce → GenTraversableOnce
  40. def foldRight[B](z: B)(op: (A, B) ⇒ B): B
    Definition Classes
    IterableLike → TraversableOnce → GenTraversableOnce
  41. def forall(p: (A) ⇒ Boolean): Boolean
    Definition Classes
    IterableLike → TraversableLike → TraversableOnce → GenTraversableOnce
  42. def foreach[U](f: (A) ⇒ U): Unit
    Definition Classes
    IterableLike → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
  43. def genericBuilder[B]: Builder[B, Iterable[B]]
    Definition Classes
    GenericTraversableTemplate
  44. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  45. def groupBy[K](f: (A) ⇒ K): Map[K, Iterable[A]]
    Definition Classes
    TraversableLike → GenTraversableLike
  46. def grouped(size: Int): Iterator[Iterable[A]]
    Definition Classes
    IterableLike
  47. def hasDefiniteSize: Boolean
    Definition Classes
    TraversableLike → TraversableOnce → GenTraversableOnce
  48. def hashCode(): Int
    Definition Classes
    AnyRef → Any
  49. def head: A
    Definition Classes
    IterableLike → TraversableLike → GenTraversableLike
  50. def headOption: Option[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  51. def init: Iterable[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  52. def inits: Iterator[Iterable[A]]
    Definition Classes
    TraversableLike
  53. def isEmpty: Boolean
    Definition Classes
    LinkedQueue → Queue → IterableLike → GenericTraversableTemplate → TraversableLike → TraversableOnce → GenTraversableOnce
  54. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  55. final def isTraversableAgain: Boolean
    Definition Classes
    TraversableLike → GenTraversableLike → GenTraversableOnce
  56. def iterator: Iterator[A]

    Returns an iterator that iterates over the items in this queue in FIFO order without consuming them.

    Returns an iterator that iterates over the items in this queue in FIFO order without consuming them. .

    returns

    the iterator

    Definition Classes
    LinkedQueue → Queue → IterableLike → GenIterableLike
  57. def last: A
    Definition Classes
    TraversableLike → GenTraversableLike
  58. def lastOption: Option[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  59. def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike → FilterMonadic
  60. def max[B >: A](implicit cmp: Ordering[B]): A
    Definition Classes
    TraversableOnce → GenTraversableOnce
  61. def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
    Definition Classes
    TraversableOnce → GenTraversableOnce
  62. def min[B >: A](implicit cmp: Ordering[B]): A
    Definition Classes
    TraversableOnce → GenTraversableOnce
  63. def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A
    Definition Classes
    TraversableOnce → GenTraversableOnce
  64. def mkString: String
    Definition Classes
    TraversableOnce → GenTraversableOnce
  65. def mkString(sep: String): String
    Definition Classes
    TraversableOnce → GenTraversableOnce
  66. def mkString(start: String, sep: String, end: String): String
    Definition Classes
    TraversableOnce → GenTraversableOnce
  67. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  68. def newBuilder: Builder[A, Iterable[A]]
    Attributes
    protected[this]
    Definition Classes
    GenericTraversableTemplate → HasNewBuilder
  69. def nonEmpty: Boolean
    Definition Classes
    TraversableOnce → GenTraversableOnce
  70. final def notify(): Unit
    Definition Classes
    AnyRef
  71. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  72. def par: ParIterable[A]
    Definition Classes
    Parallelizable
  73. def parCombiner: Combiner[A, ParIterable[A]]
    Attributes
    protected[this]
    Definition Classes
    TraversableLike → Parallelizable
  74. def partition(p: (A) ⇒ Boolean): (Iterable[A], Iterable[A])
    Definition Classes
    TraversableLike → GenTraversableLike
  75. def peek: A

    Returns the item least recently added to this queue without consuming it.

    Returns the item least recently added to this queue without consuming it.

    returns

    first item of this queue

    Definition Classes
    LinkedQueue → Queue
    Exceptions thrown

    NoSuchElementException if this queue is empty

  76. def product[B >: A](implicit num: Numeric[B]): B
    Definition Classes
    TraversableOnce → GenTraversableOnce
  77. def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1
    Definition Classes
    TraversableOnce → GenTraversableOnce
  78. def reduceLeft[B >: A](op: (B, A) ⇒ B): B
    Definition Classes
    TraversableOnce
  79. def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  80. def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  81. def reduceRight[B >: A](op: (A, B) ⇒ B): B
    Definition Classes
    IterableLike → TraversableOnce → GenTraversableOnce
  82. def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  83. def repr: Iterable[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  84. def reversed: List[A]
    Attributes
    protected[this]
    Definition Classes
    TraversableOnce
  85. def sameElements[B >: A](that: GenIterable[B]): Boolean
    Definition Classes
    IterableLike → GenIterableLike
  86. def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike
  87. def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike
  88. def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[Iterable[A], B, That]): That
    Definition Classes
    TraversableLike → GenTraversableLike
    Annotations
    @migration
    Migration

    (Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.

  89. def seq: Iterable[A]
    Definition Classes
    Iterable → GenIterable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce
  90. def size: Int
    Definition Classes
    LinkedQueue → Queue → GenTraversableLike → TraversableOnce → GenTraversableOnce
  91. def sizeHintIfCheap: Int
    Attributes
    protected[scala.collection]
    Definition Classes
    GenTraversableOnce
  92. def slice(from: Int, until: Int): Iterable[A]
    Definition Classes
    IterableLike → TraversableLike → GenTraversableLike
  93. def sliding(size: Int, step: Int): Iterator[Iterable[A]]
    Definition Classes
    IterableLike
  94. def sliding(size: Int): Iterator[Iterable[A]]
    Definition Classes
    IterableLike
  95. def span(p: (A) ⇒ Boolean): (Iterable[A], Iterable[A])
    Definition Classes
    TraversableLike → GenTraversableLike
  96. def splitAt(n: Int): (Iterable[A], Iterable[A])
    Definition Classes
    TraversableLike → GenTraversableLike
  97. def stringPrefix: String
    Definition Classes
    TraversableLike → GenTraversableLike
  98. def sum[B >: A](implicit num: Numeric[B]): B
    Definition Classes
    TraversableOnce → GenTraversableOnce
  99. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  100. def tail: Iterable[A]
    Definition Classes
    TraversableLike → GenTraversableLike
  101. def tails: Iterator[Iterable[A]]
    Definition Classes
    TraversableLike
  102. def take(n: Int): Iterable[A]
    Definition Classes
    IterableLike → TraversableLike → GenTraversableLike
  103. def takeRight(n: Int): Iterable[A]
    Definition Classes
    IterableLike
  104. def takeWhile(p: (A) ⇒ Boolean): Iterable[A]
    Definition Classes
    IterableLike → TraversableLike → GenTraversableLike
  105. def thisCollection: Iterable[A]
    Attributes
    protected[this]
    Definition Classes
    IterableLike → TraversableLike
  106. def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, A, Col[A]]): Col[A]
    Definition Classes
    TraversableLike → TraversableOnce → GenTraversableOnce
  107. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  108. def toBuffer[B >: A]: Buffer[B]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  109. def toCollection(repr: Iterable[A]): Iterable[A]
    Attributes
    protected[this]
    Definition Classes
    IterableLike → TraversableLike
  110. def toIndexedSeq: IndexedSeq[A]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  111. def toIterable: Iterable[A]
    Definition Classes
    IterableLike → TraversableOnce → GenTraversableOnce
  112. def toIterator: Iterator[A]
    Definition Classes
    IterableLike → TraversableLike → GenTraversableOnce
    Annotations
    @deprecatedOverriding( ... , "2.11.0" )
  113. def toList: List[A]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  114. def toMap[T, U](implicit ev: <:<[A, (T, U)]): Map[T, U]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  115. def toSeq: Seq[A]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  116. def toSet[B >: A]: Set[B]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  117. def toStream: Stream[A]
    Definition Classes
    IterableLike → TraversableLike → GenTraversableOnce
  118. def toString(): String

    Returns a string representation of this queue without consuming it.

    Returns a string representation of this queue without consuming it.

    returns

    the sequence of items in FIFO order

    Definition Classes
    Queue → TraversableLike → AnyRef → Any
  119. def toTraversable: Traversable[A]
    Definition Classes
    TraversableLike → TraversableOnce → GenTraversableOnce
    Annotations
    @deprecatedOverriding( ... , "2.11.0" )
  120. def toVector: Vector[A]
    Definition Classes
    TraversableOnce → GenTraversableOnce
  121. def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): Iterable[Iterable[B]]
    Definition Classes
    GenericTraversableTemplate
    Annotations
    @migration
    Migration

    (Changed in version 2.9.0) transpose throws an IllegalArgumentException if collections are not uniformly sized.

  122. def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (Iterable[A1], Iterable[A2])
    Definition Classes
    GenericTraversableTemplate
  123. def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (Iterable[A1], Iterable[A2], Iterable[A3])
    Definition Classes
    GenericTraversableTemplate
  124. def view(from: Int, until: Int): IterableView[A, Iterable[A]]
    Definition Classes
    IterableLike → TraversableLike
  125. def view: IterableView[A, Iterable[A]]
    Definition Classes
    IterableLike → TraversableLike
  126. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  127. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  128. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  129. def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, Iterable[A]]
    Definition Classes
    TraversableLike → FilterMonadic
  130. def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[Iterable[A], (A1, B), That]): That
    Definition Classes
    IterableLike → GenIterableLike
  131. def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[Iterable[A], (A1, B), That]): That
    Definition Classes
    IterableLike → GenIterableLike
  132. def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[Iterable[A], (A1, Int), That]): That
    Definition Classes
    IterableLike → GenIterableLike

Inherited from Queue[A]

Inherited from Iterable[A]

Inherited from IterableLike[A, Iterable[A]]

Inherited from Equals

Inherited from GenIterable[A]

Inherited from GenIterableLike[A, Iterable[A]]

Inherited from Traversable[A]

Inherited from GenTraversable[A]

Inherited from GenericTraversableTemplate[A, Iterable]

Inherited from TraversableLike[A, Iterable[A]]

Inherited from GenTraversableLike[A, Iterable[A]]

Inherited from Parallelizable[A, ParIterable[A]]

Inherited from TraversableOnce[A]

Inherited from GenTraversableOnce[A]

Inherited from FilterMonadic[A, Iterable[A]]

Inherited from HasNewBuilder[A, Iterable[A] @scala.annotation.unchecked.uncheckedVariance]

Inherited from AnyRef

Inherited from Any

Ungrouped