Use isEmpty() instead of size() for emptiness

src/gui/cookiesmodel.cpp

@@ -157,7 +157,7 @@ bool CookiesModel::insertRows(int row, int count, const QModelIndex &parent)
 
 bool CookiesModel::removeRows(int row, int count, const QModelIndex &parent)
 {
-    if ((m_cookies.size() == 0)
+    if ((m_cookies.isEmpty())
         || (row >= m_cookies.size())
         || ((row + count) > m_cookies.size()))
         return false;

src/gui/previewselectdialog.cpp

@@ -124,7 +124,7 @@ PreviewSelectDialog::~PreviewSelectDialog()
 void PreviewSelectDialog::previewButtonClicked()
 {
     QModelIndexList selectedIndexes = previewList->selectionModel()->selectedRows(FILE_INDEX);
-    if (selectedIndexes.size() == 0) return;
+    if (selectedIndexes.isEmpty()) return;
 
     // Flush data
     m_torrent->flushCache();

src/gui/rss/rsswidget.cpp

@@ -150,7 +150,7 @@ void RSSWidget::displayRSSListMenu(const QPoint &pos)
         m_feedListWidget->clearSelection();
     QMenu myRSSListMenu(this);
     QList<QTreeWidgetItem *> selectedItems = m_feedListWidget->selectedItems();
-    if (selectedItems.size() > 0) {
+    if (!selectedItems.isEmpty()) {
         myRSSListMenu.addAction(m_ui->actionUpdate);
         myRSSListMenu.addAction(m_ui->actionMarkItemsRead);
         myRSSListMenu.addSeparator();

src/gui/tagfiltermodel.cpp

@@ -326,7 +326,7 @@ QVector<TagModelItem *> TagFilterModel::findItems(const QSet<QString> &tags)
 
 TagModelItem *TagFilterModel::allTagsItem()
 {
-    Q_ASSERT(m_tagItems.size() > 0);
+    Q_ASSERT(!m_tagItems.isEmpty());
     return &m_tagItems[0];
 }
 

src/gui/transferlistfilterswidget.cpp

@@ -485,7 +485,7 @@ void TrackerFiltersList::handleNewTorrent(BitTorrent::TorrentHandle *const torre
         addItem(tracker.url(), hash);
 
     //Check for trackerless torrent
-    if (trackers.size() == 0)
+    if (trackers.isEmpty())
         addItem("", hash);
 
     item(0)->setText(tr("All (%1)", "this is for the tracker filter").arg(++m_totalTorrents));
@@ -499,7 +499,7 @@ void TrackerFiltersList::torrentAboutToBeDeleted(BitTorrent::TorrentHandle *cons
         removeItem(tracker.url(), hash);
 
     //Check for trackerless torrent
-    if (trackers.size() == 0)
+    if (trackers.isEmpty())
         removeItem("", hash);
 
     item(0)->setText(tr("All (%1)", "this is for the tracker filter").arg(--m_totalTorrents));

src/gui/transferlistwidget.cpp

@@ -878,7 +878,7 @@ void TransferListWidget::clearSelectionTags()
 void TransferListWidget::displayListMenu(const QPoint&)
 {
     const QModelIndexList selectedIndexes = selectionModel()->selectedRows();
-    if (selectedIndexes.size() == 0) return;
+    if (selectedIndexes.isEmpty()) return;
 
     // Create actions
     QAction actionStart(GuiIconProvider::instance()->getIcon("media-playback-start"), tr("Resume", "Resume/start the torrent"), nullptr);