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storage/downloader_queue_interface.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "storage/storage_defines.hpp"
+#include "storage/queued_country.hpp"
+
+namespace storage
+{
+class QueueInterface
+{
+public:
+  using ForEachCountryFunction = std::function<void(QueuedCountry const & country)>;
+
+  virtual bool IsEmpty() const = 0;
+  virtual size_t Count() const = 0;
+  virtual bool Contains(CountryId const & country) const = 0;
+  virtual void ForEachCountry(ForEachCountryFunction const & fn) const = 0;
+
+protected:
+  virtual ~QueueInterface() = default;
+};
+}  // namespace storage