mpl: add const to method param

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

Author: joaomai

src/mpl/src/SACoreSoftMacro.cpp

@@ -903,7 +903,8 @@ void SACoreSoftMacro::fillDeadSpace()
   }
 }
 
-int SACoreSoftMacro::getSegmentIndex(float segment, std::vector<float>& coords)
+int SACoreSoftMacro::getSegmentIndex(float segment,
+                                     const std::vector<float>& coords)
 {
   int index = std::distance(
       coords.begin(), std::lower_bound(coords.begin(), coords.end(), segment));

src/mpl/src/SACoreSoftMacro.h

@@ -83,7 +83,7 @@ class SACoreSoftMacro : public SimulatedAnnealingCore<SoftMacro>
   // actions used
   void resizeOneCluster();
 
-  int getSegmentIndex(float segment, std::vector<float>& coords);
+  int getSegmentIndex(float segment, const std::vector<float>& coords);
 
   void calBoundaryPenalty();
   float calSingleNotchPenalty(float width, float height);