Use range-based for loops

src/base/bittorrent/torrenthandle.cpp

@@ -1174,10 +1174,8 @@ QBitArray TorrentHandle::downloadingPieces() const
     std::vector<lt::partial_piece_info> queue;
     m_nativeHandle.get_download_queue(queue);
 
-    std::vector<lt::partial_piece_info>::const_iterator it = queue.begin();
-    std::vector<lt::partial_piece_info>::const_iterator itend = queue.end();
-    for (; it != itend; ++it)
-        result.setBit(it->piece_index);
+    for (const lt::partial_piece_info &info : queue)
+        result.setBit(info.piece_index);
 
     return result;
 }

src/base/scanfoldersmodel.cpp

@@ -341,7 +341,7 @@ void ScanFoldersModel::configure()
 {
     const QVariantHash dirs = Preferences::instance()->getScanDirs();
 
-    for (QVariantHash::const_iterator i = dirs.begin(), e = dirs.end(); i != e; ++i) {
+    for (auto i = dirs.cbegin(); i != dirs.cend(); ++i) {
         if (i.value().type() == QVariant::Int)
             addPath(i.key(), static_cast<PathType>(i.value().toInt()), QString());
         else

src/gui/torrentcontenttreeview.cpp

@@ -69,9 +69,8 @@ void TorrentContentTreeView::keyPressEvent(QKeyEvent *event)
 
     const QModelIndexList selection = selectionModel()->selectedRows(TorrentContentModelItem::COL_NAME);
 
-    for (QModelIndexList::const_iterator i = selection.begin(); i != selection.end(); ++i) {
-        QModelIndex index = *i;
-        Q_ASSERT(i->column() == TorrentContentModelItem::COL_NAME);
+    for (const QModelIndex &index : selection) {
+        Q_ASSERT(index.column() == TorrentContentModelItem::COL_NAME);
         model()->setData(index, state, Qt::CheckStateRole);
     }
 }

src/webui/api/appcontroller.cpp

@@ -112,7 +112,7 @@ void AppController::preferencesAction()
     // Automatically add torrents from
     const QVariantHash dirs = pref->getScanDirs();
     QVariantMap nativeDirs;
-    for (QVariantHash::const_iterator i = dirs.cbegin(), e = dirs.cend(); i != e; ++i) {
+    for (auto i = dirs.cbegin(); i != dirs.cend(); ++i) {
         if (i.value().type() == QVariant::Int)
             nativeDirs.insert(Utils::Fs::toNativePath(i.key()), i.value().toInt());
         else
@@ -299,7 +299,7 @@ void AppController::setPreferencesAction()
         QVariantHash oldScanDirs = pref->getScanDirs();
         QVariantHash scanDirs;
         ScanFoldersModel *model = ScanFoldersModel::instance();
-        for (QVariantMap::const_iterator i = nativeDirs.cbegin(), e = nativeDirs.cend(); i != e; ++i) {
+        for (auto i = nativeDirs.cbegin(); i != nativeDirs.cend(); ++i) {
             QString folder = Utils::Fs::fromNativePath(i.key());
             int downloadType;
             QString downloadPath;