Avoid repeating the return type

src/base/bittorrent/private/speedmonitor.cpp

@@ -47,10 +47,10 @@ void SpeedMonitor::addSample(const SpeedSample &sample)
 SpeedSampleAvg SpeedMonitor::average() const
 {
     if (m_speedSamples.empty())
-        return SpeedSampleAvg();
+        return {};
 
     const qreal k = qreal(1.) / m_speedSamples.size();
-    return SpeedSampleAvg(m_sum.download * k, m_sum.upload * k);
+    return {m_sum.download * k, m_sum.upload * k};
 }
 
 void SpeedMonitor::reset()

src/base/bittorrent/session.cpp

@@ -4299,11 +4299,11 @@ namespace
 
         using PCONVERTIFACENAMETOLUID = NETIO_STATUS (WINAPI *)(const WCHAR *, PNET_LUID);
         const auto ConvertIfaceNameToLuid = Utils::Misc::loadWinAPI<PCONVERTIFACENAMETOLUID>("Iphlpapi.dll", "ConvertInterfaceNameToLuidW");
-        if (!ConvertIfaceNameToLuid) return QString();
+        if (!ConvertIfaceNameToLuid) return {};
 
         using PCONVERTIFACELUIDTOGUID = NETIO_STATUS (WINAPI *)(const NET_LUID *, GUID *);
         const auto ConvertIfaceLuidToGuid = Utils::Misc::loadWinAPI<PCONVERTIFACELUIDTOGUID>("Iphlpapi.dll", "ConvertInterfaceLuidToGuid");
-        if (!ConvertIfaceLuidToGuid) return QString();
+        if (!ConvertIfaceLuidToGuid) return {};
 
         NET_LUID luid;
         const LONG res = ConvertIfaceNameToLuid(name.toStdWString().c_str(), &luid);
@@ -4313,7 +4313,7 @@ namespace
                 return QUuid(guid).toString().toUpper();
         }
 
-        return QString();
+        return {};
     }
 #endif
 }

src/base/bittorrent/torrenthandle.cpp

@@ -297,7 +297,7 @@ QString TorrentHandle::savePath(bool actual) const
 QString TorrentHandle::rootPath(bool actual) const
 {
     if ((filesCount() > 1) && !hasRootFolder())
-        return QString();
+        return {};
 
     const QString firstFilePath = filePath(0);
     const int slashIndex = firstFilePath.indexOf('/');
@@ -593,7 +593,7 @@ QString TorrentHandle::filePath(int index) const
 
 QString TorrentHandle::fileName(int index) const
 {
-    if (!hasMetadata()) return QString();
+    if (!hasMetadata()) return {};
     return Utils::Fs::fileName(filePath(index));
 }
 
@@ -606,7 +606,7 @@ qlonglong TorrentHandle::fileSize(int index) const
 // to all files in a torrent
 QStringList TorrentHandle::absoluteFilePaths() const
 {
-    if (!hasMetadata()) return QStringList();
+    if (!hasMetadata()) return {};
 
     const QDir saveDir(savePath(true));
     QStringList res;
@@ -617,7 +617,7 @@ QStringList TorrentHandle::absoluteFilePaths() const
 
 QStringList TorrentHandle::absoluteFilePathsUnwanted() const
 {
-    if (!hasMetadata()) return QStringList();
+    if (!hasMetadata()) return {};
 
     const QDir saveDir(savePath(true));
     QStringList res;
@@ -987,7 +987,7 @@ QDateTime TorrentHandle::lastSeenComplete() const
     if (m_nativeStatus.last_seen_complete > 0)
         return QDateTime::fromTime_t(m_nativeStatus.last_seen_complete);
     else
-        return QDateTime();
+        return {};
 }
 
 QDateTime TorrentHandle::completedTime() const
@@ -995,7 +995,7 @@ QDateTime TorrentHandle::completedTime() const
     if (m_nativeStatus.completed_time > 0)
         return QDateTime::fromTime_t(m_nativeStatus.completed_time);
     else
-        return QDateTime();
+        return {};
 }
 
 int TorrentHandle::timeSinceUpload() const

src/base/bittorrent/torrentinfo.cpp

@@ -133,32 +133,32 @@ bool TorrentInfo::isValid() const
 
 InfoHash TorrentInfo::hash() const
 {
-    if (!isValid()) return InfoHash();
+    if (!isValid()) return {};
     return m_nativeInfo->info_hash();
 }
 
 QString TorrentInfo::name() const
 {
-    if (!isValid()) return QString();
+    if (!isValid()) return {};
     return QString::fromStdString(m_nativeInfo->name());
 }
 
 QDateTime TorrentInfo::creationDate() const
 {
-    if (!isValid()) return QDateTime();
+    if (!isValid()) return {};
     const boost::optional<time_t> t = m_nativeInfo->creation_date();
     return t ? QDateTime::fromTime_t(*t) : QDateTime();
 }
 
 QString TorrentInfo::creator() const
 {
-    if (!isValid()) return QString();
+    if (!isValid()) return {};
     return QString::fromStdString(m_nativeInfo->creator());
 }
 
 QString TorrentInfo::comment() const
 {
-    if (!isValid()) return QString();
+    if (!isValid()) return {};
     return QString::fromStdString(m_nativeInfo->comment());
 }
 
@@ -200,7 +200,7 @@ int TorrentInfo::piecesCount() const
 
 QString TorrentInfo::filePath(const int index) const
 {
-    if (!isValid()) return QString();
+    if (!isValid()) return {};
     return Utils::Fs::fromNativePath(QString::fromStdString(m_nativeInfo->files().file_path(index)));
 }
 
@@ -220,7 +220,7 @@ QString TorrentInfo::fileName(const int index) const
 
 QString TorrentInfo::origFilePath(const int index) const
 {
-    if (!isValid()) return QString();
+    if (!isValid()) return {};
     return Utils::Fs::fromNativePath(QString::fromStdString(m_nativeInfo->orig_files().file_path(index)));
 }
 
@@ -238,7 +238,7 @@ qlonglong TorrentInfo::fileOffset(const int index) const
 
 QList<TrackerEntry> TorrentInfo::trackers() const
 {
-    if (!isValid()) return QList<TrackerEntry>();
+    if (!isValid()) return {};
 
     QList<TrackerEntry> trackers;
     for (const libt::announce_entry &tracker : m_nativeInfo->trackers())
@@ -249,7 +249,7 @@ QList<TrackerEntry> TorrentInfo::trackers() const
 
 QList<QUrl> TorrentInfo::urlSeeds() const
 {
-    if (!isValid()) return QList<QUrl>();
+    if (!isValid()) return {};
 
     QList<QUrl> urlSeeds;
     for (const libt::web_seed_entry &webSeed : m_nativeInfo->web_seeds())
@@ -261,8 +261,8 @@ QList<QUrl> TorrentInfo::urlSeeds() const
 
 QByteArray TorrentInfo::metadata() const
 {
-    if (!isValid()) return QByteArray();
+    if (!isValid()) return {};
-    return QByteArray(m_nativeInfo->metadata().get(), m_nativeInfo->metadata_size());
+    return {m_nativeInfo->metadata().get(), m_nativeInfo->metadata_size()};
 }
 
 QStringList TorrentInfo::filesForPiece(const int pieceIndex) const
@@ -281,7 +281,7 @@ QStringList TorrentInfo::filesForPiece(const int pieceIndex) const
 QVector<int> TorrentInfo::fileIndicesForPiece(const int pieceIndex) const
 {
     if (!isValid() || (pieceIndex < 0) || (pieceIndex >= piecesCount()))
-        return QVector<int>();
+        return {};
 
     const std::vector<libt::file_slice> files(
         nativeInfo()->map_block(pieceIndex, 0, nativeInfo()->piece_size(pieceIndex)));

src/base/logger.cpp

@@ -98,7 +98,7 @@ QVector<Log::Msg> Logger::getMessages(int lastKnownId) const
         return m_messages;
 
     if (diff <= 0)
-        return QVector<Log::Msg>();
+        return {};
 
     return m_messages.mid(size - diff);
 }
@@ -114,7 +114,7 @@ QVector<Log::Peer> Logger::getPeers(int lastKnownId) const
         return m_peers;
 
     if (diff <= 0)
-        return QVector<Log::Peer>();
+        return {};
 
     return m_peers.mid(size - diff);
 }

src/base/net/dnsupdater.cpp

@@ -288,11 +288,11 @@ QUrl DNSUpdater::getRegistrationUrl(int service)
 {
     switch (service) {
     case DNS::DYNDNS:
-        return QUrl("https://www.dyndns.com/account/services/hosts/add.html");
+        return {"https://www.dyndns.com/account/services/hosts/add.html"};
     case DNS::NOIP:
-        return QUrl("https://www.noip.com/remote-access");
+        return {"https://www.noip.com/remote-access"};
     default:
         Q_ASSERT(0);
     }
-    return QUrl();
+    return {};
 }

src/base/net/geoipmanager.cpp

@@ -129,7 +129,7 @@ QString GeoIPManager::lookup(const QHostAddress &hostAddr) const
     if (m_enabled && m_geoIPDatabase)
         return m_geoIPDatabase->lookup(hostAddr);
 
-    return QString();
+    return {};
 }
 
 QString GeoIPManager::CountryName(const QString &countryISOCode)

src/base/net/private/geoipdatabase.cpp

@@ -176,7 +176,7 @@ QString GeoIPDatabase::lookup(const QHostAddress &hostAddr) const
             fromBigEndian(idPtr, 4);
 
             if (id == m_nodeCount) {
-                return QString();
+                return {};
             }
             if (id > m_nodeCount) {
                 QString country = m_countries.value(id);
@@ -196,7 +196,7 @@ QString GeoIPDatabase::lookup(const QHostAddress &hostAddr) const
         }
     }
 
-    return QString();
+    return {};
 }
 
 #define CHECK_METADATA_REQ(key, type) \
@@ -304,14 +304,14 @@ QVariantHash GeoIPDatabase::readMetadata() const
             return metadata.toHash();
     }
 
-    return QVariantHash();
+    return {};
 }
 
 QVariant GeoIPDatabase::readDataField(quint32 &offset) const
 {
     DataFieldDescriptor descr;
     if (!readDataFieldDescriptor(offset, descr))
-        return QVariant();
+        return {};
 
     quint32 locOffset = offset;
     bool usePointer = false;
@@ -320,7 +320,7 @@ QVariant GeoIPDatabase::readDataField(quint32 &offset) const
         // convert offset from data section to global
         locOffset = descr.offset + (m_nodeCount * m_recordSize / 4) + sizeof(DATA_SECTION_SEPARATOR);
         if (!readDataFieldDescriptor(locOffset, descr))
-            return QVariant();
+            return {};
     }
 
     QVariant fieldValue;
@@ -459,12 +459,12 @@ QVariant GeoIPDatabase::readMapValue(quint32 &offset, quint32 count) const
     for (quint32 i = 0; i < count; ++i) {
         QVariant field = readDataField(offset);
         if (field.userType() != QMetaType::QString)
-            return QVariant();
+            return {};
 
         QString key = field.toString();
         field = readDataField(offset);
         if (field.userType() == QVariant::Invalid)
-            return QVariant();
+            return {};
 
         map[key] = field;
     }
@@ -479,7 +479,7 @@ QVariant GeoIPDatabase::readArrayValue(quint32 &offset, quint32 count) const
     for (quint32 i = 0; i < count; ++i) {
         QVariant field = readDataField(offset);
         if (field.userType() == QVariant::Invalid)
-            return QVariant();
+            return {};
 
         array.append(field);
     }

src/base/rss/private/rss_parser.cpp

@@ -464,7 +464,7 @@ namespace
                 offset = parts[2].toInt(&ok[0]) * 3600;
                 int offsetMin = parts[3].toInt(&ok[1]);
                 if (!ok[0] || !ok[1] || offsetMin > 59)
-                    return QDateTime();
+                    return {};
                 offset += offsetMin * 60;
                 negOffset = (parts[1] == QLatin1String("-"));
                 if (negOffset)
@@ -494,7 +494,7 @@ namespace
                         for (int i = 0, end = zone.size(); (i < end) && !nonalpha; ++i)
                             nonalpha = !isalpha(zone[i]);
                         if (nonalpha)
-                            return QDateTime();
+                            return {};
                         // TODO: Attempt to recognize the time zone abbreviation?
                         negOffset = true;    // unknown time zone: RFC 2822 treats as '-0000'
                     }

src/base/rss/rss_autodownloadrule.cpp

@@ -68,7 +68,7 @@ namespace
         switch (static_cast<int>(triStateBool)) {
         case 0:  return false;
         case 1:  return true;
-        default: return QJsonValue();
+        default: return {};
         }
     }
 
@@ -159,7 +159,7 @@ QString computeEpisodeName(const QString &article)
 
     // See if we can extract an season/episode number or date from the title
     if (!match.hasMatch())
-        return QString();
+        return {};
 
     QStringList ret;
     for (int i = 1; i <= match.lastCapturedIndex(); ++i) {

src/base/scanfoldersmodel.cpp

@@ -107,7 +107,7 @@ int ScanFoldersModel::columnCount(const QModelIndex &parent) const
 QVariant ScanFoldersModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid() || (index.row() >= rowCount()))
-        return QVariant();
+        return {};
 
     const PathData *pathData = m_pathList.at(index.row());
     QVariant value;
@@ -141,7 +141,7 @@ QVariant ScanFoldersModel::data(const QModelIndex &index, int role) const
 QVariant ScanFoldersModel::headerData(int section, Qt::Orientation orientation, int role) const
 {
     if ((orientation != Qt::Horizontal) || (role != Qt::DisplayRole) || (section < 0) || (section >= columnCount()))
-        return QVariant();
+        return {};
 
     QVariant title;
 
@@ -311,7 +311,7 @@ QString ScanFoldersModel::downloadPathTorrentFolder(const QString &filePath) con
     if (data->downloadType == CUSTOM_LOCATION)
         return data->downloadPath;
 
-    return  QString();
+    return {};
 }
 
 int ScanFoldersModel::findPathData(const QString &path) const
@@ -399,5 +399,5 @@ QString ScanFoldersModel::pathTypeDisplayName(const PathType type)
     default:
         qDebug("Invalid PathType: %d", type);
     };
-    return QString();
+    return {};
 }

src/base/settingsstorage.cpp

@@ -282,7 +282,7 @@ QString TransactionalSettings::deserialize(const QString &name, QVariantHash &da
     SettingsPtr settings = Profile::instance().applicationSettings(name);
 
     if (settings->allKeys().isEmpty())
-        return QString();
+        return {};
 
     // Copy everything into memory. This means even keys inserted in the file manually
     // or that we don't touch directly in this code (eg disabled by ifdef). This ensures
@@ -314,5 +314,5 @@ QString TransactionalSettings::serialize(const QString &name, const QVariantHash
         Logger::instance()->addMessage(QObject::tr("An unknown error occurred while trying to write the configuration file."), Log::CRITICAL);
         break;
     }
-    return QString();
+    return {};
 }

src/base/utils/foreignapps.cpp

@@ -227,7 +227,7 @@ namespace
                 return path;
         }
 
-        return QString();
+        return {};
     }
 #endif // Q_OS_WIN
 }

src/base/utils/misc.cpp

@@ -256,7 +256,7 @@ QPoint Utils::Misc::screenCenter(const QWidget *w)
     QDesktopWidget *desktop = QApplication::desktop();
     int scrn = desktop->screenNumber(parent);  // fallback to `primaryScreen` when parent is invalid
     QRect r = desktop->availableGeometry(scrn);
-    return QPoint(r.x() + (r.width() - w->frameSize().width()) / 2, r.y() + (r.height() - w->frameSize().height()) / 2);
+    return {r.x() + (r.width() - w->frameSize().width()) / 2, r.y() + (r.height() - w->frameSize().height()) / 2};
 }
 #endif
 

src/base/utils/net.cpp

@@ -110,7 +110,7 @@ namespace Utils
             QSslKey key {data, QSsl::Rsa};
             if (!key.isNull())
                 return key;
-            return QSslKey(data, QSsl::Ec);
+            return {data, QSsl::Ec};
         }
 
         bool isSSLKeyValid(const QByteArray &data)

src/gui/autoexpandabledialog.cpp

@@ -71,7 +71,7 @@ QString AutoExpandableDialog::getText(QWidget *parent, const QString &title, con
     if (ok)
         *ok = res;
 
-    if (!res) return QString();
+    if (!res) return {};
 
     return d.m_ui->textEdit->text();
 }

src/gui/categoryfiltermodel.cpp

@@ -207,7 +207,7 @@ int CategoryFilterModel::columnCount(const QModelIndex &) const
 
 QVariant CategoryFilterModel::data(const QModelIndex &index, int role) const
 {
-    if (!index.isValid()) return QVariant();
+    if (!index.isValid()) return {};
 
     auto item = static_cast<CategoryModelItem *>(index.internalPointer());
 
@@ -224,7 +224,7 @@ QVariant CategoryFilterModel::data(const QModelIndex &index, int role) const
         return item->torrentsCount();
     }
 
-    return QVariant();
+    return {};
 }
 
 Qt::ItemFlags CategoryFilterModel::flags(const QModelIndex &index) const
@@ -240,32 +240,32 @@ QVariant CategoryFilterModel::headerData(int section, Qt::Orientation orientatio
         if (section == 0)
             return tr("Categories");
 
-    return QVariant();
+    return {};
 }
 
 QModelIndex CategoryFilterModel::index(int row, int column, const QModelIndex &parent) const
 {
     if (column > 0)
-        return QModelIndex();
+        return {};
 
     if (parent.isValid() && (parent.column() != 0))
-        return QModelIndex();
+        return {};
 
     auto parentItem = parent.isValid() ? static_cast<CategoryModelItem *>(parent.internalPointer())
                                        : m_rootItem;
     if (row < parentItem->childCount())
         return createIndex(row, column, parentItem->childAt(row));
 
-    return QModelIndex();
+    return {};
 }
 
 QModelIndex CategoryFilterModel::parent(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return QModelIndex();
+        return {};
 
     auto item = static_cast<CategoryModelItem *>(index.internalPointer());
-    if (!item) return QModelIndex();
+    if (!item) return {};
 
     return this->index(item->parent());
 }
@@ -291,13 +291,13 @@ QModelIndex CategoryFilterModel::index(const QString &categoryName) const
 
 QString CategoryFilterModel::categoryName(const QModelIndex &index) const
 {
-    if (!index.isValid()) return QString();
+    if (!index.isValid()) return {};
     return static_cast<CategoryModelItem *>(index.internalPointer())->fullName();
 }
 
 QModelIndex CategoryFilterModel::index(CategoryModelItem *item) const
 {
-    if (!item || !item->parent()) return QModelIndex();
+    if (!item || !item->parent()) return {};
 
     return index(item->pos(), 0, index(item->parent()));
 }

src/gui/cookiesmodel.cpp

@@ -58,7 +58,7 @@ QVariant CookiesModel::headerData(int section, Qt::Orientation orientation, int
         }
     }
 
-    return QVariant();
+    return {};
 }
 
 QModelIndex CookiesModel::index(int row, int column, const QModelIndex &parent) const
@@ -66,7 +66,7 @@ QModelIndex CookiesModel::index(int row, int column, const QModelIndex &parent)
     if (parent.isValid() // no items with valid parent
         || (row < 0) || (row >= m_cookies.size())
         || (column < 0) || (column >= NB_COLUMNS))
-        return QModelIndex();
+        return {};
 
     return createIndex(row, column, &m_cookies[row]);
 }
@@ -74,7 +74,7 @@ QModelIndex CookiesModel::index(int row, int column, const QModelIndex &parent)
 QModelIndex CookiesModel::parent(const QModelIndex &index) const
 {
     Q_UNUSED(index);
-    return QModelIndex();
+    return {};
 }
 
 int CookiesModel::rowCount(const QModelIndex &parent) const
@@ -94,7 +94,7 @@ QVariant CookiesModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid() || (index.row() >= m_cookies.size())
         || ((role != Qt::DisplayRole) && (role != Qt::EditRole)))
-        return QVariant();
+        return {};
 
     switch (index.column()) {
     case COL_DOMAIN:
@@ -109,7 +109,7 @@ QVariant CookiesModel::data(const QModelIndex &index, int role) const
         return m_cookies[index.row()].expirationDate();
     }
 
-    return QVariant();
+    return {};
 }
 
 bool CookiesModel::setData(const QModelIndex &index, const QVariant &value, int role)

src/gui/fspathedit_p.cpp

@@ -311,7 +311,7 @@ QString Private::FileLineEdit::warningText(FileSystemPathValidator::TestResult r
     case TestResult::CantWrite:
         return tr("Does not have write permission in '%1'");
     default:
-        return QString();
+        return {};
     }
 }
 

src/gui/guiiconprovider.cpp

@@ -90,7 +90,7 @@ QIcon GuiIconProvider::getIcon(const QString &iconId, const QString &fallback) c
 
 QIcon GuiIconProvider::getFlagIcon(const QString &countryIsoCode) const
 {
-    if (countryIsoCode.isEmpty()) return QIcon();
+    if (countryIsoCode.isEmpty()) return {};
     return QIcon(":/icons/flags/" + countryIsoCode.toLower() + ".svg");
 }
 

src/gui/optionsdialog.cpp

@@ -1447,14 +1447,14 @@ QString OptionsDialog::getTorrentExportDir() const
 {
     if (m_ui->checkExportDir->isChecked())
         return Utils::Fs::expandPathAbs(m_ui->textExportDir->selectedPath());
-    return QString();
+    return {};
 }
 
 QString OptionsDialog::getFinishedTorrentExportDir() const
 {
     if (m_ui->checkExportDirFin->isChecked())
         return Utils::Fs::expandPathAbs(m_ui->textExportDirFin->selectedPath());
-    return QString();
+    return {};
 }
 
 // Return action on double-click on a downloading torrent set in options

src/gui/programupdater.cpp

@@ -166,6 +166,6 @@ namespace
         if (xml.isCharacters() && !xml.isWhitespace())
             return xml.text().toString();
 
-        return QString();
+        return {};
     }
 }

src/gui/rss/htmlbrowser.cpp

@@ -80,7 +80,7 @@ QVariant HtmlBrowser::loadResource(int type, const QUrl &name)
             m_netManager->get(req);
         }
 
-        return QVariant();
+        return {};
     }
 
     return QTextBrowser::loadResource(type, name);

src/gui/search/searchjobwidget.cpp

@@ -385,7 +385,7 @@ QString SearchJobWidget::statusText(SearchJobWidget::Status st)
     case Status::NoResults:
         return tr("Search returned no results");
     default:
-        return QString();
+        return {};
     }
 }
 

src/gui/search/searchwidget.cpp

@@ -83,7 +83,7 @@ namespace
         case SearchJobWidget::Status::NoResults:
             return QLatin1String("task-attention");
         default:
-            return QString();
+            return {};
         }
     }
 }

src/gui/tagfiltermodel.cpp

@@ -114,7 +114,7 @@ bool TagFilterModel::isSpecialItem(const QModelIndex &index)
 QVariant TagFilterModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid() || (index.column() != 0))
-        return QVariant();
+        return {};
 
     const int row = index.internalId();
     Q_ASSERT(isValidRow(row));
@@ -129,7 +129,7 @@ QVariant TagFilterModel::data(const QModelIndex &index, int role) const
     case Qt::UserRole:
         return item.torrentsCount();
     default:
-        return QVariant();
+        return {};
     }
 }
 
@@ -145,13 +145,13 @@ QVariant TagFilterModel::headerData(int section, Qt::Orientation orientation, in
     if ((orientation == Qt::Horizontal) && (role == Qt::DisplayRole))
         if (section == 0)
             return tr("Tags");
-    return QVariant();
+    return {};
 }
 
 QModelIndex TagFilterModel::index(int row, int, const QModelIndex &) const
 {
     if (!isValidRow(row))
-        return QModelIndex();
+        return {};
     return createIndex(row, 0, row);
 }
 
@@ -171,14 +171,14 @@ QModelIndex TagFilterModel::index(const QString &tag) const
 {
     const int row = findRow(tag);
     if (!isValidRow(row))
-        return QModelIndex();
+        return {};
     return index(row, 0, QModelIndex());
 }
 
 QString TagFilterModel::tag(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return QString();
+        return {};
     const int row = index.internalId();
     Q_ASSERT(isValidRow(row));
     return m_tagItems[row].tag();

src/gui/torrentcontentfiltermodel.cpp

@@ -66,10 +66,10 @@ int TorrentContentFilterModel::getFileIndex(const QModelIndex &index) const
 
 QModelIndex TorrentContentFilterModel::parent(const QModelIndex &child) const
 {
-    if (!child.isValid()) return QModelIndex();
+    if (!child.isValid()) return {};
 
     QModelIndex sourceParent = m_model->parent(mapToSource(child));
-    if (!sourceParent.isValid()) return QModelIndex();
+    if (!sourceParent.isValid()) return {};
 
     return mapFromSource(sourceParent);
 }

src/gui/torrentcontentmodel.cpp

@@ -113,12 +113,12 @@ namespace
             const QString ext = info.suffix();
             if (!ext.isEmpty()) {
                 QPixmap cached;
-                if (QPixmapCache::find(ext, &cached)) return QIcon(cached);
+                if (QPixmapCache::find(ext, &cached)) return {cached};
 
                 const QPixmap pixmap = pixmapForExtension(ext);
                 if (!pixmap.isNull()) {
                     QPixmapCache::insert(ext, pixmap);
-                    return QIcon(pixmap);
+                    return {pixmap};
                 }
             }
             return UnifiedFileIconProvider::icon(info);
@@ -140,7 +140,7 @@ namespace
             HRESULT hr = ::SHGetFileInfoW(extWithDot.toStdWString().c_str(),
                 FILE_ATTRIBUTE_NORMAL, &sfi, sizeof(sfi), SHGFI_ICON | SHGFI_USEFILEATTRIBUTES);
             if (FAILED(hr))
-                return QPixmap();
+                return {};
 
             QPixmap iconPixmap = QtWin::fromHICON(sfi.hIcon);
             ::DestroyIcon(sfi.hIcon);
@@ -354,7 +354,7 @@ int TorrentContentModel::getFileIndex(const QModelIndex &index)
 QVariant TorrentContentModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid())
-        return QVariant();
+        return {};
 
     auto *item = static_cast<TorrentContentModelItem*>(index.internalPointer());
 
@@ -376,7 +376,7 @@ QVariant TorrentContentModel::data(const QModelIndex &index, int role) const
     if (role == Qt::DisplayRole)
         return item->data(index.column());
 
-    return QVariant();
+    return {};
 }
 
 Qt::ItemFlags TorrentContentModel::flags(const QModelIndex &index) const
@@ -395,16 +395,16 @@ QVariant TorrentContentModel::headerData(int section, Qt::Orientation orientatio
     if ((orientation == Qt::Horizontal) && (role == Qt::DisplayRole))
         return m_rootItem->data(section);
 
-    return QVariant();
+    return {};
 }
 
 QModelIndex TorrentContentModel::index(int row, int column, const QModelIndex &parent) const
 {
     if (parent.isValid() && (parent.column() != 0))
-        return QModelIndex();
+        return {};
 
     if (column >= TorrentContentModelItem::NB_COL)
-        return QModelIndex();
+        return {};
 
     TorrentContentModelFolder *parentItem;
     if (!parent.isValid())
@@ -414,26 +414,26 @@ QModelIndex TorrentContentModel::index(int row, int column, const QModelIndex &p
     Q_ASSERT(parentItem);
 
     if (row >= parentItem->childCount())
-        return QModelIndex();
+        return {};
 
     TorrentContentModelItem *childItem = parentItem->child(row);
     if (childItem)
         return createIndex(row, column, childItem);
-    return QModelIndex();
+    return {};
 }
 
 QModelIndex TorrentContentModel::parent(const QModelIndex &index) const
 {
     if (!index.isValid())
-        return QModelIndex();
+        return {};
 
     auto *childItem = static_cast<TorrentContentModelItem*>(index.internalPointer());
     if (!childItem)
-        return QModelIndex();
+        return {};
 
     TorrentContentModelItem *parentItem = childItem->parent();
     if (parentItem == m_rootItem)
-        return QModelIndex();
+        return {};
 
     return createIndex(parentItem->row(), 0, parentItem);
 }

src/gui/torrentcontentmodelitem.cpp

@@ -121,7 +121,7 @@ QVariant TorrentContentModelItem::data(int column) const
         return availability();
     default:
         Q_ASSERT(false);
-        return QVariant();
+        return {};
     }
 }
 

src/gui/torrentcontenttreeview.cpp

@@ -81,7 +81,7 @@ QModelIndex TorrentContentTreeView::currentNameCell()
     QModelIndex current = currentIndex();
     if (!current.isValid()) {
         Q_ASSERT(false);
-        return QModelIndex();
+        return {};
     }
 
     return model()->index(current.row(), TorrentContentModelItem::COL_NAME, current.parent());

src/gui/transferlistmodel.cpp

@@ -125,7 +125,7 @@ QVariant TransferListModel::headerData(int section, Qt::Orientation orientation,
             case TR_LAST_ACTIVITY: return tr("Last Activity", "Time passed since a chunk was downloaded/uploaded");
             case TR_TOTAL_SIZE: return tr("Total Size", "i.e. Size including unwanted data");
             default:
-                return QVariant();
+                return {};
             }
         }
         else if (role == Qt::TextAlignmentRole) {
@@ -149,22 +149,22 @@ QVariant TransferListModel::headerData(int section, Qt::Orientation orientation,
             case TR_RATIO:
             case TR_PRIORITY:
             case TR_LAST_ACTIVITY:
-                return QVariant(Qt::AlignRight | Qt::AlignVCenter);
+                return {Qt::AlignRight | Qt::AlignVCenter};
             default:
                 return QAbstractListModel::headerData(section, orientation, role);
             }
         }
     }
 
-    return QVariant();
+    return {};
 }
 
 QVariant TransferListModel::data(const QModelIndex &index, int role) const
 {
-    if (!index.isValid()) return QVariant();
+    if (!index.isValid()) return {};
 
     BitTorrent::TorrentHandle *const torrent = m_torrents.value(index.row());
-    if (!torrent) return QVariant();
+    if (!torrent) return {};
 
     if ((role == Qt::DecorationRole) && (index.column() == TR_NAME))
         return getIconByState(torrent->state());
@@ -173,7 +173,7 @@ QVariant TransferListModel::data(const QModelIndex &index, int role) const
         return getColorByState(torrent->state());
 
     if ((role != Qt::DisplayRole) && (role != Qt::UserRole))
-        return QVariant();
+        return {};
 
     switch (index.column()) {
     case TR_NAME:
@@ -243,7 +243,7 @@ QVariant TransferListModel::data(const QModelIndex &index, int role) const
         return torrent->totalSize();
     }
 
-    return QVariant();
+    return {};
 }
 
 bool TransferListModel::setData(const QModelIndex &index, const QVariant &value, int role)
@@ -366,32 +366,32 @@ QColor getColorByState(BitTorrent::TorrentState state)
     case BitTorrent::TorrentState::ForcedDownloading:
     case BitTorrent::TorrentState::DownloadingMetadata:
         if (!dark)
-            return QColor(34, 139, 34); // Forest Green
+            return {34, 139, 34}; // Forest Green
         else
-            return QColor(50, 205, 50); // Lime Green
+            return {50, 205, 50}; // Lime Green
     case BitTorrent::TorrentState::Allocating:
     case BitTorrent::TorrentState::StalledDownloading:
     case BitTorrent::TorrentState::StalledUploading:
         if (!dark)
-            return QColor(0, 0, 0); // Black
+            return {0, 0, 0}; // Black
         else
-            return QColor(204, 204, 204); // Gray 80
+            return {204, 204, 204}; // Gray 80
     case BitTorrent::TorrentState::Uploading:
     case BitTorrent::TorrentState::ForcedUploading:
         if (!dark)
-            return QColor(65, 105, 225); // Royal Blue
+            return {65, 105, 225}; // Royal Blue
         else
-            return QColor(99, 184, 255); // Steel Blue 1
+            return {99, 184, 255}; // Steel Blue 1
     case BitTorrent::TorrentState::PausedDownloading:
-        return QColor(250, 128, 114); // Salmon
+        return {250, 128, 114}; // Salmon
     case BitTorrent::TorrentState::PausedUploading:
         if (!dark)
-            return QColor(0, 0, 139); // Dark Blue
+            return {0, 0, 139}; // Dark Blue
         else
-            return QColor(79, 148, 205); // Steel Blue 3
+            return {79, 148, 205}; // Steel Blue 3
     case BitTorrent::TorrentState::Error:
     case BitTorrent::TorrentState::MissingFiles:
-        return QColor(255, 0, 0); // red
+        return {255, 0, 0}; // red
     case BitTorrent::TorrentState::QueuedDownloading:
     case BitTorrent::TorrentState::QueuedUploading:
     case BitTorrent::TorrentState::CheckingDownloading:
@@ -399,14 +399,14 @@ QColor getColorByState(BitTorrent::TorrentState state)
     case BitTorrent::TorrentState::CheckingResumeData:
     case BitTorrent::TorrentState::Moving:
         if (!dark)
-            return QColor(0, 128, 128); // Teal
+            return {0, 128, 128}; // Teal
         else
-            return QColor(0, 205, 205); // Cyan 3
+            return {0, 205, 205}; // Cyan 3
     case BitTorrent::TorrentState::Unknown:
-        return QColor(255, 0, 0); // red
+        return {255, 0, 0}; // red
     default:
         Q_ASSERT(false);
-        return QColor(255, 0, 0); // red
+        return {255, 0, 0}; // red
     }
 }
 

src/gui/transferlistwidget.cpp

@@ -101,7 +101,7 @@ namespace
     QSize CheckBoxIconHelper::sizeHint() const
     {
         const int dim = QCheckBox::sizeHint().height();
-        return QSize(dim, dim);
+        return {dim, dim};
     }
 
     void CheckBoxIconHelper::initStyleOption(QStyleOptionButton *opt) const
@@ -812,7 +812,7 @@ QStringList TransferListWidget::askTagsForSelection(const QString &dialogTitle)
         const QString tagsInput = AutoExpandableDialog::getText(
             this, dialogTitle, tr("Comma-separated tags:"), QLineEdit::Normal, "", &ok).trimmed();
         if (!ok || tagsInput.isEmpty())
-            return QStringList();
+            return {};
         tags = tagsInput.split(',', QString::SkipEmptyParts);
         for (QString &tag : tags) {
             tag = tag.trimmed();

src/gui/utils.cpp

@@ -96,7 +96,7 @@ QSize Utils::Gui::smallIconSize(const QWidget *widget)
     // Get DPI scaled icon size (device-dependent), see QT source
     // under a 1080p screen is usually 16x16
     const int s = QApplication::style()->pixelMetric(QStyle::PM_SmallIconSize, nullptr, widget);
-    return QSize(s, s);
+    return {s, s};
 }
 
 QSize Utils::Gui::mediumIconSize(const QWidget *widget)
@@ -110,5 +110,5 @@ QSize Utils::Gui::largeIconSize(const QWidget *widget)
     // Get DPI scaled icon size (device-dependent), see QT source
     // under a 1080p screen is usually 32x32
     const int s = QApplication::style()->pixelMetric(QStyle::PM_LargeIconSize, nullptr, widget);
-    return QSize(s, s);
+    return {s, s};
 }

src/webui/webapplication.cpp

@@ -94,7 +94,7 @@ namespace
     inline QUrl urlFromHostHeader(const QString &hostHeader)
     {
         if (!hostHeader.contains(QLatin1String("://")))
-            return QUrl(QLatin1String("http://") + hostHeader);
+            return {QLatin1String("http://") + hostHeader};
         return hostHeader;
     }