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38 lines
701 B
Go
38 lines
701 B
Go
package mpb
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import "container/heap"
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var _ heap.Interface = (*priorityQueue)(nil)
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type priorityQueue []*Bar
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func (pq priorityQueue) Len() int { return len(pq) }
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func (pq priorityQueue) Less(i, j int) bool {
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// greater priority pops first
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return pq[i].priority > pq[j].priority
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}
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func (pq priorityQueue) Swap(i, j int) {
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pq[i], pq[j] = pq[j], pq[i]
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pq[i].index = i
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pq[j].index = j
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}
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func (pq *priorityQueue) Push(x interface{}) {
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n := len(*pq)
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bar := x.(*Bar)
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bar.index = n
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*pq = append(*pq, bar)
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}
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func (pq *priorityQueue) Pop() interface{} {
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old := *pq
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n := len(old)
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bar := old[n-1]
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old[n-1] = nil // avoid memory leak
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bar.index = -1 // for safety
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*pq = old[:n-1]
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return bar
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}
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