New cpp folder structure

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

libs/routing/base/astar_weight.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "base/assert.hpp"
+
+#include <limits>
+
+namespace routing
+{
+template <typename Weight>
+constexpr Weight GetAStarWeightZero();
+
+template <>
+constexpr double GetAStarWeightZero<double>()
+{
+  return 0.0;
+}
+
+// Precision of comparison weights.
+template <typename Weight>
+constexpr Weight GetAStarWeightEpsilon()
+{
+  UNREACHABLE();
+}
+
+template <>
+constexpr double GetAStarWeightEpsilon<double>()
+{
+  return 1e-6;
+}
+
+template <typename Weight>
+constexpr Weight GetAStarWeightMax();
+
+template <>
+constexpr double GetAStarWeightMax<double>()
+{
+  return std::numeric_limits<double>::max();
+}
+
+}  // namespace routing