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libs/storage/downloader_queue_universal.hpp

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+#pragma once
+
+#include "storage/downloader_queue_interface.hpp"
+#include "storage/queued_country.hpp"
+#include "storage/storage_defines.hpp"
+
+#include <list>
+#include <utility>
+
+namespace storage
+{
+class Queue : public QueueInterface
+{
+public:
+  using ForEachCountryMutable = std::function<void(QueuedCountry & country)>;
+
+  // QueueInterface overrides:
+  bool IsEmpty() const override;
+  size_t Count() const override;
+  bool Contains(CountryId const & country) const override;
+  void ForEachCountry(ForEachCountryFunction const & fn) const override;
+
+  void ForEachCountry(ForEachCountryMutable const & fn);
+
+  CountryId const & GetFirstId() const;
+  QueuedCountry const & GetFirstCountry() const;
+  void PopFront();
+
+  void Append(QueuedCountry && country);
+
+  void Remove(CountryId const & country);
+  void Clear();
+
+private:
+  std::list<QueuedCountry> m_queue;
+};
+}  // namespace storage