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59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
// Copyright 2021 Google LLC
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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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// https://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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#ifndef THIRD_PARTY_NEARBY_INTERNAL_BASE_OBSERVER_LIST_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_BASE_OBSERVER_LIST_H_
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#include <string>
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#include <vector>
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#include "absl/container/flat_hash_set.h"
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namespace nearby {
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template <class ObserverType>
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class ObserverList {
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public:
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using iterator = typename absl::flat_hash_set<ObserverType*>::iterator;
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using const_iterator =
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typename absl::flat_hash_set<ObserverType*>::const_iterator;
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void AddObserver(ObserverType* observer) { observers_.emplace(observer); }
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void RemoveObserver(ObserverType* observer) { observers_.erase(observer); }
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bool HasObserver(ObserverType* observer) {
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return observers_.contains(observer);
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}
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void Clear() { observers_.clear(); }
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bool empty() const { return observers_.empty(); }
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int size() const { return observers_.size(); }
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// Supports iterators
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iterator begin() { return observers_.begin(); }
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iterator end() { return observers_.end(); }
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const_iterator begin() const { return observers_.begin(); }
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const_iterator end() const { return observers_.end(); }
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private:
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absl::flat_hash_set<ObserverType*> observers_;
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};
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_INTERNAL_BASE_OBSERVER_LIST_H_
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