New cpp folder structure

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

tools/openlr/openlr_decoder.hpp

@@ -0,0 +1,61 @@
+#pragma once
+
+#include "openlr/stats.hpp"
+
+#include "indexer/data_source.hpp"
+
+#include "base/exception.hpp"
+
+#include <cstdint>
+#include <functional>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+namespace openlr
+{
+struct LinearSegment;
+struct DecodedPath;
+
+DECLARE_EXCEPTION(DecoderError, RootException);
+
+class Graph;
+class RoadInfoGetter;
+
+class OpenLRDecoder
+{
+public:
+  using CountryParentNameGetter = std::function<std::string(std::string const &)>;
+
+  class SegmentsFilter
+  {
+  public:
+    SegmentsFilter(std::string const & idsPath, bool const multipointsOnly);
+
+    bool Matches(LinearSegment const & segment) const;
+
+  private:
+    std::unordered_set<uint32_t> m_ids;
+    bool m_idsSet;
+    bool const m_multipointsOnly;
+  };
+
+  OpenLRDecoder(std::vector<FrozenDataSource> & dataSources,
+                CountryParentNameGetter const & countryParentNameGetter);
+
+  // Maps partner segments to mwm paths. |segments| should be sorted by partner id.
+  void DecodeV2(std::vector<LinearSegment> const & segments, uint32_t const numThreads,
+                std::vector<DecodedPath> & paths);
+
+  void DecodeV3(std::vector<LinearSegment> const & segments, uint32_t numThreads,
+                std::vector<DecodedPath> & paths);
+
+private:
+  template <typename Decoder, typename Stats>
+  void Decode(std::vector<LinearSegment> const & segments, uint32_t const numThreads,
+              std::vector<DecodedPath> & paths);
+
+  std::vector<FrozenDataSource> & m_dataSources;
+  CountryParentNameGetter m_countryParentNameGetter;
+};
+}  // namespace openlr