55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
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// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package regexp
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type sparseSet struct {
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dense []uint
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sparse []uint
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size uint
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}
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func newSparseSet(size uint) *sparseSet {
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return &sparseSet{
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dense: make([]uint, size),
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sparse: make([]uint, size),
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size: 0,
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}
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}
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func (s *sparseSet) Len() int {
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return int(s.size)
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}
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func (s *sparseSet) Add(ip uint) uint {
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i := s.size
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s.dense[i] = ip
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s.sparse[ip] = i
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s.size++
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return i
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}
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func (s *sparseSet) Get(i uint) uint {
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return s.dense[i]
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}
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func (s *sparseSet) Contains(ip uint) bool {
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i := s.sparse[ip]
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return i < s.size && s.dense[i] == ip
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}
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func (s *sparseSet) Clear() {
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s.size = 0
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}
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