gui: Mark returned selection const

Signed-off-by: Martin Povišer <[email protected]>

Author: povik

src/gui/include/gui/gui.h

@@ -640,7 +640,7 @@ class Gui
   void addSelectedInst(const char* name);
 
   // Return the selected set
-  SelectionSet& selection();
+  const SelectionSet& selection();
 
   // check if any object(inst/net) is present in sect/highlight set
   bool anyObjectInSet(bool selection_set, odb::dbObjectType obj_type) const;

src/gui/src/gui.cpp

@@ -334,7 +334,7 @@ void Gui::addSelectedInst(const char* name)
   main_window->addSelected(makeSelected(inst));
 }
 
-SelectionSet& Gui::selection()
+const SelectionSet& Gui::selection()
 {
   return main_window->selection();
 }

src/gui/src/mainWindow.cpp

@@ -530,7 +530,7 @@ void MainWindow::updateTitle()
   }
 }
 
-SelectionSet& MainWindow::selection()
+const SelectionSet& MainWindow::selection()
 {
   return selected_;
 }

src/gui/src/mainWindow.h

@@ -101,7 +101,7 @@ class MainWindow : public QMainWindow, public odb::dbDatabaseObserver
   void setTitle(const std::string& title);
 
   // Return the selected set
-  SelectionSet& selection();
+  const SelectionSet& selection();
 
  signals:
   // Signaled when we get a postRead callback to tell the sub-widgets