New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/storage/downloader_queue_universal.cpp

@@ -0,0 +1,76 @@
+#include "storage/downloader_queue_universal.hpp"
+
+#include <algorithm>
+
+namespace storage
+{
+bool Queue::IsEmpty() const
+{
+  return m_queue.empty();
+}
+
+size_t Queue::Count() const
+{
+  return m_queue.size();
+}
+
+bool Queue::Contains(CountryId const & country) const
+{
+  return base::IsExist(m_queue, country);
+}
+
+void Queue::ForEachCountry(ForEachCountryFunction const & fn) const
+{
+  for (auto const & queuedCountry : m_queue)
+  {
+    fn(queuedCountry);
+  }
+}
+
+void Queue::ForEachCountry(ForEachCountryMutable const & fn)
+{
+  for (auto & queuedCountry : m_queue)
+  {
+    fn(queuedCountry);
+  }
+}
+
+CountryId const & Queue::GetFirstId() const
+{
+  CHECK(!m_queue.empty(), ());
+
+  return m_queue.front().GetCountryId();
+}
+
+QueuedCountry const & Queue::GetFirstCountry() const
+{
+  CHECK(!m_queue.empty(), ());
+
+  return m_queue.front();
+}
+
+void Queue::Remove(const storage::CountryId & id)
+{
+  auto it = std::find(m_queue.begin(), m_queue.end(), id);
+  if (it != m_queue.end())
+    m_queue.erase(it);
+}
+
+void Queue::PopFront()
+{
+  CHECK(!m_queue.empty(), ());
+
+  m_queue.pop_front();
+}
+
+void Queue::Append(QueuedCountry && country)
+{
+  m_queue.emplace_back(std::move(country));
+  m_queue.back().OnCountryInQueue();
+}
+
+void Queue::Clear()
+{
+  m_queue.clear();
+}
+}  // namespace storage