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package adt

import ""

Package adt implements useful abstract data types.


ivt := &adt.IntervalTree{}

ivt.Insert(adt.NewInt64Interval(1, 3), 123)
ivt.Insert(adt.NewInt64Interval(9, 13), 456)
ivt.Insert(adt.NewInt64Interval(7, 20), 789)

rs := ivt.Stab(adt.NewInt64Point(10))
for _, v := range rs {
    fmt.Printf("Overlapping range: %+v\n", v)


Overlapping range: &{Ivl:{Begin:7 End:20} Val:789}
Overlapping range: &{Ivl:{Begin:9 End:13} Val:456}



Package Files

doc.go interval_tree.go

type BytesAffineComparable Uses

type BytesAffineComparable []byte

BytesAffineComparable treats empty byte arrays as > all other byte arrays

func (BytesAffineComparable) Compare Uses

func (b BytesAffineComparable) Compare(c Comparable) int

type Comparable Uses

type Comparable interface {
    // Compare gives the result of a 3-way comparison
    // a.Compare(b) = 1 => a > b
    // a.Compare(b) = 0 => a == b
    // a.Compare(b) = -1 => a < b
    Compare(c Comparable) int

Comparable is an interface for trichotomic comparisons.

type Int64Comparable Uses

type Int64Comparable int64

func (Int64Comparable) Compare Uses

func (v Int64Comparable) Compare(c Comparable) int

type Interval Uses

type Interval struct {
    Begin Comparable
    End   Comparable

Interval implements a Comparable interval [begin, end) TODO: support different sorts of intervals: (a,b), [a,b], (a, b]

func NewBytesAffineInterval Uses

func NewBytesAffineInterval(begin, end []byte) Interval

func NewBytesAffinePoint Uses

func NewBytesAffinePoint(b []byte) Interval

func NewInt64Interval Uses

func NewInt64Interval(a int64, b int64) Interval

func NewInt64Point Uses

func NewInt64Point(a int64) Interval

func NewStringAffineInterval Uses

func NewStringAffineInterval(begin, end string) Interval

func NewStringAffinePoint Uses

func NewStringAffinePoint(s string) Interval

func NewStringInterval Uses

func NewStringInterval(begin, end string) Interval

func NewStringPoint Uses

func NewStringPoint(s string) Interval

func (*Interval) Compare Uses

func (ivl *Interval) Compare(c Comparable) int

Compare on an interval gives == if the interval overlaps.

type IntervalTree Uses

type IntervalTree struct {
    // contains filtered or unexported fields

IntervalTree represents a (mostly) textbook implementation of the "Introduction to Algorithms" (Cormen et al, 2nd ed.) chapter 13 red-black tree and chapter 14.3 interval tree with search supporting "stabbing queries".

func (*IntervalTree) Contains Uses

func (ivt *IntervalTree) Contains(ivl Interval) bool

Contains returns true if the interval tree's keys cover the entire given interval.

func (*IntervalTree) Delete Uses

func (ivt *IntervalTree) Delete(ivl Interval) bool

Delete removes the node with the given interval from the tree, returning true if a node is in fact removed.

func (*IntervalTree) Find Uses

func (ivt *IntervalTree) Find(ivl Interval) (ret *IntervalValue)

Find gets the IntervalValue for the node matching the given interval

func (*IntervalTree) Height Uses

func (ivt *IntervalTree) Height() int

Height is the number of levels in the tree; one node has height 1.

func (*IntervalTree) Insert Uses

func (ivt *IntervalTree) Insert(ivl Interval, val interface{})

Insert adds a node with the given interval into the tree.

func (*IntervalTree) Intersects Uses

func (ivt *IntervalTree) Intersects(iv Interval) bool

Intersects returns true if there is some tree node intersecting the given interval.

func (*IntervalTree) Len Uses

func (ivt *IntervalTree) Len() int

Len gives the number of elements in the tree

func (*IntervalTree) MaxHeight Uses

func (ivt *IntervalTree) MaxHeight() int

MaxHeight is the expected maximum tree height given the number of nodes

func (*IntervalTree) Stab Uses

func (ivt *IntervalTree) Stab(iv Interval) (ivs []*IntervalValue)

Stab returns a slice with all elements in the tree intersecting the interval.

func (*IntervalTree) Union Uses

func (ivt *IntervalTree) Union(inIvt IntervalTree, ivl Interval)

Union merges a given interval tree into the receiver.

func (*IntervalTree) Visit Uses

func (ivt *IntervalTree) Visit(ivl Interval, ivv IntervalVisitor)

Visit calls a visitor function on every tree node intersecting the given interval. It will visit each interval [x, y) in ascending order sorted on x.

type IntervalValue Uses

type IntervalValue struct {
    Ivl Interval
    Val interface{}

type IntervalVisitor Uses

type IntervalVisitor func(n *IntervalValue) bool

IntervalVisitor is used on tree searches; return false to stop searching.

type StringAffineComparable Uses

type StringAffineComparable string

StringAffineComparable treats "" as > all other strings

func (StringAffineComparable) Compare Uses

func (s StringAffineComparable) Compare(c Comparable) int

type StringComparable Uses

type StringComparable string

func (StringComparable) Compare Uses

func (s StringComparable) Compare(c Comparable) int

Package adt imports 2 packages (graph) and is imported by 31 packages. Updated 2019-06-14. Refresh now. Tools for package owners.