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// Copyright 2016 The Netstack Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tcp
type segmentHeap []*segment
// Len returns the length of h.
func (h segmentHeap) Len() int {
return len(h)
}
// Less determines whether the i-th element of h is less than the j-th element.
func (h segmentHeap) Less(i, j int) bool {
return h[i].sequenceNumber.LessThan(h[j].sequenceNumber)
}
// Swap swaps the i-th and j-th elements of h.
func (h segmentHeap) Swap(i, j int) {
h[i], h[j] = h[j], h[i]
}
// Push adds x as the last element of h.
func (h *segmentHeap) Push(x interface{}) {
*h = append(*h, x.(*segment))
}
// Pop removes the last element of h and returns it.
func (h *segmentHeap) Pop() interface{} {
old := *h
n := len(old)
x := old[n-1]
*h = old[:n-1]
return x
}
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