76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
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// Copyright (c) 2017 Computer Vision Center (CVC) at the Universitat Autonoma
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// de Barcelona (UAB).
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//
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// This work is licensed under the terms of the MIT license.
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// For a copy, see <https://opensource.org/licenses/MIT>.
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#pragma once
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#include "carla/AtomicSharedPtr.h"
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#include "carla/NonCopyable.h"
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#include <algorithm>
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#include <mutex>
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#include <vector>
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namespace carla {
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namespace client {
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namespace detail {
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/// Holds an atomic pointer to a list.
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///
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/// @warning Only Load method is atomic, modifications to the list are locked
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/// with a mutex.
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template <typename T>
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class AtomicList : private NonCopyable {
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using ListT = std::vector<T>;
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public:
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AtomicList() : _list(std::make_shared<ListT>()) {}
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template <typename ValueT>
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void Push(ValueT &&value) {
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std::lock_guard<std::mutex> lock(_mutex);
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auto new_list = std::make_shared<ListT>(*Load());
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new_list->emplace_back(std::forward<ValueT>(value));
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_list = new_list;
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}
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void DeleteByIndex(size_t index) {
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std::lock_guard<std::mutex> lock(_mutex);
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auto new_list = std::make_shared<ListT>(*Load());
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auto begin = new_list->begin();
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std::advance(begin, index);
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new_list->erase(begin);
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_list = new_list;
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}
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template <typename ValueT>
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void DeleteByValue(const ValueT &value) {
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std::lock_guard<std::mutex> lock(_mutex);
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auto new_list = std::make_shared<ListT>(*Load());
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new_list->erase(std::remove(new_list->begin(), new_list->end(), value), new_list->end());
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_list = new_list;
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}
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void Clear() {
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std::lock_guard<std::mutex> lock(_mutex);
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_list = std::make_shared<ListT>();
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}
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/// Returns a pointer to the list.
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std::shared_ptr<const ListT> Load() const {
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return _list.load();
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}
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private:
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std::mutex _mutex;
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AtomicSharedPtr<const ListT> _list;
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};
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} // namespace detail
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} // namespace client
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} // namespace carla
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