mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-07-30 08:33:45 +00:00
ac8164f5a4
* port changes from #1013 * port changes from #1068 * go.mod tidy * fix compile error * fix goimports * fix log * address review comments * upgrade golang.org/x/net to 0.23.0 * bump version * remove unused flag * update da-codec commit --------- Co-authored-by: Péter Garamvölgyi <peter@scroll.io>
109 lines
2 KiB
Go
109 lines
2 KiB
Go
package common
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import (
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"container/heap"
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)
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// Heap is a generic min-heap (or max-heap, depending on Comparable behavior) implementation.
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type Heap[T Comparable[T]] struct {
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heap innerHeap[T]
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}
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func NewHeap[T Comparable[T]]() *Heap[T] {
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return &Heap[T]{
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heap: make(innerHeap[T], 0),
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}
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}
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func (h *Heap[T]) Len() int {
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return len(h.heap)
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}
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func (h *Heap[T]) Push(element T) *HeapElement[T] {
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heapElement := NewHeapElement(element)
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heap.Push(&h.heap, heapElement)
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return heapElement
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}
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func (h *Heap[T]) Pop() *HeapElement[T] {
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return heap.Pop(&h.heap).(*HeapElement[T])
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}
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func (h *Heap[T]) Peek() *HeapElement[T] {
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if h.Len() == 0 {
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return nil
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}
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return h.heap[0]
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}
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func (h *Heap[T]) Remove(element *HeapElement[T]) {
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heap.Remove(&h.heap, element.index)
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}
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func (h *Heap[T]) Clear() {
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h.heap = make(innerHeap[T], 0)
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}
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type innerHeap[T Comparable[T]] []*HeapElement[T]
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func (h innerHeap[T]) Len() int {
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return len(h)
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}
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func (h innerHeap[T]) Less(i, j int) bool {
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return h[i].Value().CompareTo(h[j].Value()) < 0
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}
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func (h innerHeap[T]) Swap(i, j int) {
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h[i], h[j] = h[j], h[i]
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h[i].index, h[j].index = i, j
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}
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func (h *innerHeap[T]) Push(x interface{}) {
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data := x.(*HeapElement[T])
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*h = append(*h, data)
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data.index = len(*h) - 1
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}
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func (h *innerHeap[T]) Pop() interface{} {
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n := len(*h)
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element := (*h)[n-1]
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(*h)[n-1] = nil // avoid memory leak
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*h = (*h)[:n-1]
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element.index = -1
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return element
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}
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// Comparable is an interface for types that can be compared.
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type Comparable[T any] interface {
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// CompareTo compares x with other.
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// To create a min heap, return:
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// -1 if x < other
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// 0 if x == other
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// +1 if x > other
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// To create a max heap, return the opposite.
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CompareTo(other T) int
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}
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// HeapElement is a wrapper around the value stored in the heap.
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type HeapElement[T Comparable[T]] struct {
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value T
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index int
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}
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func NewHeapElement[T Comparable[T]](value T) *HeapElement[T] {
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return &HeapElement[T]{
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value: value,
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}
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}
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func (h *HeapElement[T]) Value() T {
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return h.value
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}
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func (h *HeapElement[T]) Index() int {
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return h.index
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}
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