Gui: modernize C++: return braced init list

src/Gui/DocumentModel.cpp

@@ -82,7 +82,7 @@ namespace Gui {
         virtual QVariant data(int role) const
         {
             Q_UNUSED(role);
-            return QVariant();
+            return {};
         }
         virtual bool setData (const QVariant & value, int role)
         {
@@ -199,7 +199,7 @@ namespace Gui {
         else if (role == Qt::DisplayRole) {
             return DocumentModel::tr("Application");
         }
-        return QVariant();
+        return {};
     }
 
     // ------------------------------------------------------------------------
@@ -271,7 +271,7 @@ namespace Gui {
             return static_cast<QVariant>(font);
         }
 
-        return QVariant();
+        return {};
     }
 
     // ------------------------------------------------------------------------
@@ -326,7 +326,7 @@ namespace Gui {
             return static_cast<QVariant>(font);
         }
 
-        return QVariant();
+        return {};
     }
 
     // ------------------------------------------------------------------------
@@ -608,7 +608,7 @@ int DocumentModel::columnCount (const QModelIndex & /*parent*/) const
 QVariant DocumentModel::data (const QModelIndex & index, int role) const
 {
     if (!index.isValid())
-        return QVariant();
+        return {};
     return static_cast<DocumentModelIndex*>(index.internalPointer())->data(role);
 }
 
@@ -625,7 +625,7 @@ Qt::ItemFlags DocumentModel::flags(const QModelIndex &index) const
     //    return Qt::ItemIsEnabled;
     //return QAbstractItemModel::flags(index);
     if (!index.isValid())
-        return Qt::ItemFlags();
+        return {};
     return static_cast<DocumentModelIndex*>(index.internalPointer())->flags();
 }
 
@@ -637,14 +637,14 @@ QModelIndex DocumentModel::index (int row, int column, const QModelIndex & paren
     else
         item = static_cast<DocumentModelIndex*>(parent.internalPointer())->child(row);
     if (!item)
-        return QModelIndex();
+        return {};
     return createIndex(row, column, item);
 }
 
 QModelIndex DocumentModel::parent (const QModelIndex & index) const
 {
     if (!index.isValid() || index.internalPointer() == d->rootItem)
-        return QModelIndex();
+        return {};
     DocumentModelIndex* item = nullptr;
     item = static_cast<DocumentModelIndex*>(index.internalPointer());
     DocumentModelIndex* parent = item->parent();
@@ -665,11 +665,11 @@ QVariant DocumentModel::headerData (int section, Qt::Orientation orientation, in
     Q_UNUSED(section);
     if (orientation == Qt::Horizontal) {
         if (role != Qt::DisplayRole)
-            return QVariant();
+            return {};
         return tr("Labels & Attributes");
     }
 
-    return QVariant();
+    return {};
 }
 
 bool DocumentModel::setHeaderData (int, Qt::Orientation, const QVariant &, int)