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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tcp
import "container/heap"
type segmentHeap []*segment
var _ heap.Interface = (*segmentHeap)(nil)
// 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]
old[n-1] = nil
*h = old[:n-1]
return x
}
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