Prepare for ISimulation w/o Instrument

Core/Simulation/ISimulation.cpp

@@ -13,6 +13,7 @@
 //  ************************************************************************************************
 
 #include "Core/Simulation/ISimulation.h"
+#include "Base/Element/PolarizerPair.h"
 #include "Base/Utils/Assert.h"
 #include "Base/Utils/StringUtils.h"
 #include "Core/Background/IBackground.h"
@@ -255,8 +256,8 @@ void ISimulation::setSampleBuilder(const std::shared_ptr<class ISampleBuilder>&
 
 PolarizerPair ISimulation::polarizerPair() const
 {
-    return {m_instrument.beam()->getPolarization(),
-        m_instrument.detector()->detectionProperties().analyzerOperator()};
+    return {m_instrument.beam().getPolarization(),
+        m_instrument.detector().detectionProperties().analyzerOperator()};
 }
 
 void ISimulation::setBackground(const IBackground& bg)