Const'ify method

src/unitsettingsdialog.cpp

@@ -49,17 +49,17 @@ UnitSettingsDialog::UnitSettingsDialog(QWidget* parent) : QWidget(parent)
     setLayout(layout);
 }
 
-int UnitSettingsDialog::getEnergyUnitId()
+int UnitSettingsDialog::getEnergyUnitId() const
 {
     return m_comboBoxLEnergiesUnit->getCurrentUnitId();
 }
 
-int UnitSettingsDialog::getLenghtUnitId()
+int UnitSettingsDialog::getLenghtUnitId() const
 {
     return m_comboBoxLengthUnit->getCurrentUnitId();
 }
 
-int UnitSettingsDialog::getTemperatureUnitId()
+int UnitSettingsDialog::getTemperatureUnitId() const
 {
     return m_comboBoxLTemperatureUnit->getCurrentUnitId();
 }

src/unitsettingsdialog.h

@@ -16,11 +16,11 @@ public:
     explicit UnitSettingsDialog(QWidget* parent = nullptr);
     virtual ~UnitSettingsDialog();
 
-    int getLenghtUnitId();
+    int getLenghtUnitId() const;
 
-    int getEnergyUnitId();
+    int getEnergyUnitId() const;
 
-    int getTemperatureUnitId();
+    int getTemperatureUnitId() const;
 
 private:
     KalziumUnitCombobox *m_comboBoxLengthUnit;