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package mpb
import "container/heap"
// A priorityQueue implements heap.Interface
type priorityQueue []*Bar
func (pq priorityQueue) Len() int { return len(pq) }
func (pq priorityQueue) Less(i, j int) bool {
return pq[i].priority < pq[j].priority
}
func (pq priorityQueue) Swap(i, j int) {
pq[i], pq[j] = pq[j], pq[i]
pq[i].index = i
pq[j].index = j
}
func (pq *priorityQueue) Push(x interface{}) {
n := len(*pq)
bar := x.(*Bar)
bar.index = n
*pq = append(*pq, bar)
}
func (pq *priorityQueue) Pop() interface{} {
old := *pq
n := len(old)
bar := old[n-1]
bar.index = -1 // for safety
*pq = old[0 : n-1]
return bar
}
// update modifies the priority of a Bar in the queue.
func (pq *priorityQueue) update(bar *Bar, priority int) {
bar.priority = priority
heap.Fix(pq, bar.index)
}
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