New cpp folder structure

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

libs/routing/mwm_hierarchy_handler.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "routing/route_weight.hpp"
+#include "routing/router.hpp"
+
+#include "routing_common/num_mwm_id.hpp"
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+namespace routing
+{
+
+/// Class for calculating penalty while crossing country borders. Also finds parent country for mwm.
+class MwmHierarchyHandler
+{
+public:
+  // Used in tests only.
+  MwmHierarchyHandler() = default;
+  // Used in IndexRouter.
+  MwmHierarchyHandler(std::shared_ptr<NumMwmIds> numMwmIds,
+                      CountryParentNameGetterFn countryParentNameGetterFn);
+
+  bool HasCrossBorderPenalty(NumMwmId mwmId1, NumMwmId mwmId2);
+  RouteWeight GetCrossBorderPenalty(NumMwmId mwmId1, NumMwmId mwmId2);
+
+private:
+  /// @return Parent country name for \a mwmId.
+  std::string GetMwmName(NumMwmId mwmId) const;
+  std::string GetParentCountry(NumMwmId mwmId) const;
+  std::string const & GetParentCountryCached(NumMwmId mwmId);
+
+  std::shared_ptr<NumMwmIds> m_numMwmIds;
+  CountryParentNameGetterFn m_countryParentNameGetterFn;
+
+  using MwmToCountry = std::unordered_map<NumMwmId, std::string>;
+  MwmToCountry m_mwmCountriesCache;
+};
+}  // namespace routing