Use smart pointer

src/gui/symbol/window.cpp

@@ -42,9 +42,10 @@ SymbolWindow::SymbolWindow(Window* parent, const String& filename)
   init(parent, symbol);
 }
 
-SymbolWindow::SymbolWindow(Window* parent, ValueActionPerformer* performer)
-  : performer(performer)
+SymbolWindow::SymbolWindow(Window* parent, unique_ptr<ValueActionPerformer> performer_)
+  : performer(move(performer_))
 {
+  assert(performer);
   // attempt to load symbol
   SymbolP symbol;
   SymbolValueP value = static_pointer_cast<SymbolValue>(performer->value);
@@ -61,7 +62,6 @@ SymbolWindow::SymbolWindow(Window* parent, ValueActionPerformer* performer)
   init(parent, symbol);
 }
 SymbolWindow::~SymbolWindow() {
-  delete performer;
 }
 
 void SymbolWindow::init(Window* parent, SymbolP symbol) {
@@ -290,7 +290,7 @@ void SymbolWindow::onUpdateUI(wxUpdateUIEvent& ev) {
   switch(ev.GetId()) {
     // file menu
     case ID_FILE_STORE: {
-      ev.Enable(performer);
+      ev.Enable((bool)performer);
       break;
     // undo/redo
     } case ID_EDIT_UNDO: {

src/gui/symbol/window.hpp

@@ -26,7 +26,7 @@ public:
   /// Construct a SymbolWindow showing a symbol from a file
   SymbolWindow(Window* parent, const String& filename);
   /// Construct a SymbolWindow showing a symbol value in a set
-  SymbolWindow(Window* parent, ValueActionPerformer* performer);
+  SymbolWindow(Window* parent, unique_ptr<ValueActionPerformer> performer);
   ~SymbolWindow();
   
 private:
@@ -39,7 +39,7 @@ private:
   SymbolPartList* parts;   ///< A list of parts in the symbol
   
   // when editing a symbol field
-  ValueActionPerformer* performer;
+  unique_ptr<ValueActionPerformer> performer;
   
   // --------------------------------------------------- : Event handling
   DECLARE_EVENT_TABLE();