1 files changed, 15 insertions, 2 deletions
diff --git a/geometry/point2d.hpp b/geometry/point2d.hpp
index 1e1ab3d838..da19528268 100644
--- a/geometry/point2d.hpp
+++ b/geometry/point2d.hpp
@@ -4,11 +4,12 @@
 #include "base/base.hpp"
 #include "base/math.hpp"
 #include "base/matrix.hpp"
+
+#include "std/array.hpp"
 #include "std/cmath.hpp"
 #include "std/sstream.hpp"
 #include "std/typeinfo.hpp"
-#include "std/array.hpp"
-
+#include "std/unordered_map.hpp"
 
 namespace m2
 {
@@ -391,3 +392,15 @@ bool AlmostEqualULPs(m2::Point<T> const & p1, m2::Point<T> const & p2, unsigned
 }
 
 }
+
+//hash function for unordered map realisation.
+namespace boost{
+template <>
+struct hash<m2::PointD>
+{
+  size_t operator()(m2::PointD const & p) const
+  {
+    return (hash<double>()(p.x) ^ (hash<double>()(p.y) >> 1));
+  }
+};
+}