mpl: const ref to function

Signed-off-by: João Mai <[email protected]>

Author: joaomai

src/mpl/src/SACoreSoftMacro.h

@@ -90,7 +90,7 @@ class SACoreSoftMacro : public SimulatedAnnealingCore<SoftMacro>
 
   std::vector<std::pair<float, float>> getClustersLocations() const;
   void setClustersLocations(
-      std::vector<std::pair<float, float>>& clusters_locations);
+      const std::vector<std::pair<float, float>>& clusters_locations);
   // Only for Cluster Placement:
   void attemptCentralization(float pre_cost);
   void moveFloorplan(const std::pair<float, float>& offset);