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57 lines
1.4 KiB
57 lines
1.4 KiB
// This is a duplicated and slightly modified version of "gopkg.in/karalabe/cookiejar.v2/collections/prque".
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package prque
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import (
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"container/heap"
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)
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// Priority queue data structure.
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type Prque struct {
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cont *sstack
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}
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// Creates a new priority queue.
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func New(setIndex setIndexCallback) *Prque {
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return &Prque{newSstack(setIndex)}
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}
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// Pushes a value with a given priority into the queue, expanding if necessary.
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func (p *Prque) Push(data interface{}, priority int64) {
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heap.Push(p.cont, &item{data, priority})
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}
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// Pops the value with the greates priority off the stack and returns it.
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// Currently no shrinking is done.
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func (p *Prque) Pop() (interface{}, int64) {
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item := heap.Pop(p.cont).(*item)
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return item.value, item.priority
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}
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// Pops only the item from the queue, dropping the associated priority value.
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func (p *Prque) PopItem() interface{} {
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return heap.Pop(p.cont).(*item).value
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}
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// Remove removes the element with the given index.
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func (p *Prque) Remove(i int) interface{} {
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if i < 0 {
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return nil
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}
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return heap.Remove(p.cont, i)
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}
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// Checks whether the priority queue is empty.
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func (p *Prque) Empty() bool {
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return p.cont.Len() == 0
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}
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// Returns the number of element in the priority queue.
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func (p *Prque) Size() int {
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return p.cont.Len()
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}
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// Clears the contents of the priority queue.
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func (p *Prque) Reset() {
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*p = *New(p.cont.setIndex)
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}
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