New cpp folder structure

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

libs/geometry/point_with_altitude.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include "geometry/point2d.hpp"
+
+#include <limits>
+#include <string>
+#include <vector>
+
+namespace geometry
+{
+using Altitude = int16_t;
+using Altitudes = std::vector<Altitude>;
+
+Altitude constexpr kInvalidAltitude = std::numeric_limits<Altitude>::min();
+Altitude constexpr kDefaultAltitudeMeters = 0;
+
+class PointWithAltitude
+{
+public:
+  PointWithAltitude();
+  PointWithAltitude(m2::PointD const & point, Altitude altitude = kDefaultAltitudeMeters);
+  operator m2::PointD() const { return m_point; }
+
+  bool operator==(PointWithAltitude const & r) const;
+  bool operator!=(PointWithAltitude const & r) const { return !(*this == r); }
+  bool operator<(PointWithAltitude const & r) const;
+
+  m2::PointD const & GetPoint() const { return m_point; }
+  Altitude GetAltitude() const { return m_altitude; }
+
+  void SetPoint(m2::PointD const & point) { m_point = point; }
+  void SetAltitude(Altitude altitude) { m_altitude = altitude; }
+
+private:
+  friend std::string DebugPrint(PointWithAltitude const & r);
+
+  m2::PointD m_point;
+  Altitude m_altitude;
+};
+
+std::string DebugPrint(PointWithAltitude const & r);
+
+template <typename T>
+m2::Point<T> GetPoint(m2::Point<T> const & point) { return point; }
+inline m2::PointD GetPoint(PointWithAltitude const & pwa) { return pwa.GetPoint(); }
+
+PointWithAltitude MakePointWithAltitudeForTesting(m2::PointD const & point);
+
+bool AlmostEqualAbs(PointWithAltitude const & lhs, PointWithAltitude const & rhs, double eps);
+}  // namespace geometry
+
+namespace std
+{
+template <>
+struct hash<geometry::PointWithAltitude>
+{
+  size_t operator()(geometry::PointWithAltitude const & point) const;
+};
+}  // namespace std