use it

Device/Histo/SimulationResult.cpp

@@ -44,12 +44,12 @@ SimulationResult& SimulationResult::operator=(SimulationResult&& other) noexcept
 
 size_t SimulationResult::rank() const
 {
-    return m_data->rank();
+    return m_coordsys ? m_coordsys->rank() : 0;
 }
 
 size_t SimulationResult::size() const
 {
-    return m_data ? m_data->size() : 0;
+    return m_coordsys ? m_coordsys->size() : 0;
 }
 
 bool SimulationResult::empty() const