made functions const

mluq/tests/estimators/TestMonteCarlo.hpp

@@ -40,9 +40,9 @@ protected:
 
   std::unique_ptr<Estimator> mcParallel;
 
-  double MeanTolerance() { return sqrt(1.0 / samples); }
+  double MeanTolerance() const { return sqrt(1.0 / samples); }
 
-  double SVarTolerance() { return sqrt(10.0 / samples); }
+  double SVarTolerance() const { return sqrt(10.0 / samples); }
 
   TestMonteCarlo(double epsilon, int samples) :
     samples(samples), epsilon(epsilon),