[Positioning] Stock: fix ReferencePoint creation

For each calibration request read, a new ReferencePoint was created in
Stock. This is because of the behaviour of unordered_set: as pertaining
to unordered_set, two elements are not considered equal if the hashes
alone are identical, they must also be actually equal (operator==).

The problem was fixed by using a custom equality check function that
checks the equality only on the coordinates of the ReferencePoint (as if
it was a Point3D).

owlps-positioning/src/referencepoint.hh

@@ -9,7 +9,6 @@ class Measurement ;
 #include "point3d.hh"
 
 #include <vector>
-#include <map>
 #include <ostream>
 #include <boost/tr1/unordered_map.hpp>
 
@@ -118,4 +117,17 @@ inline bool ReferencePoint::operator!=(const ReferencePoint &source) const
 
 
 
+struct reference_point_equal_to:
+  public std::binary_function<ReferencePoint, ReferencePoint, bool>
+{
+  bool operator()(const ReferencePoint &source1,
+                  const ReferencePoint &source2) const
+  {
+    return
+      static_cast<Point3D>(source1) == static_cast<Point3D>(source2) ;
+  }
+} ;
+
+
+
 #endif // _OWLPS_POSITIONING_REFERENCEPOINT_HH_

owlps-positioning/src/stock.cc

@@ -17,7 +17,9 @@ unordered_map<string, Mobile> Stock::mobiles ;
 
 unordered_map<string, AccessPoint> Stock::aps ;
 
-unordered_set<ReferencePoint> Stock::reference_points ;
+unordered_set<ReferencePoint,
+              boost::hash<ReferencePoint>,
+              reference_point_equal_to> Stock::reference_points ;
 
 unordered_set<CalibrationRequest> Stock::calibration_requests ;
 

owlps-positioning/src/stock.hh

@@ -31,7 +31,9 @@ private:
   static std::tr1::unordered_map<std::string, AccessPoint> aps ;
 
   /// List of known ReferencePoint
-  static std::tr1::unordered_set<ReferencePoint> reference_points ;
+  static std::tr1::unordered_set
+  <ReferencePoint, boost::hash<ReferencePoint>, reference_point_equal_to>
+  reference_points ;
 
   /// List of known CalibrationRequest
   static std::tr1::unordered_set<CalibrationRequest> calibration_requests ;