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// Copyright 2015 CoreOS, Inc.
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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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// http://www.apache.org/licenses/LICENSE-2.0
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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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func (s *set) Add(value string) {
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func (s *set) Remove(value string) {
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func (s *set) Contains(value string) (exists bool) {
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_, exists = s.data[value]
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func (s *set) Length() int {
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func (s *set) Values() (values []string) {
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for val, _ := range s.data {
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values = append(values, val)
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return &set{make(map[string]bool)}