QtCore: eradicate all Q_FOREACH loops [threads, plugins]

Saves just shy of 4KiB in text size on optimized GCC 4.9 Linux
AMD64 builds, iow: ~0.07% of the total QtCore library size.

Change-Id: I87fdcc8ee25c6bb5dabddb9a694ab4496b1538fa
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

src/corelib/plugin/qfactoryloader.cpp

@@ -265,7 +265,8 @@ QList<QJsonObject> QFactoryLoader::metaData() const
         metaData.append(d->libraryList.at(i)->metaData);
 #endif
 
-    foreach (const QStaticPlugin &plugin, QPluginLoader::staticPlugins()) {
+    const auto staticPlugins = QPluginLoader::staticPlugins();
+    for (const QStaticPlugin &plugin : staticPlugins) {
         const QJsonObject object = plugin.metaData();
         if (object.value(iidKeyLiteral()) != QLatin1String(d->iid.constData(), d->iid.size()))
             continue;

src/corelib/plugin/qlibrary.cpp

@@ -406,7 +406,7 @@ inline void QLibraryStore::cleanup()
 
     if (qt_debug_component()) {
         // dump all objects that remain
-        foreach (QLibraryPrivate *lib, data->libraryMap) {
+        for (QLibraryPrivate *lib : qAsConst(data->libraryMap)) {
             if (lib)
                 qDebug() << "On QtCore unload," << lib->fileName << "was leaked, with"
                          << lib->libraryRefCount.load() << "users";

src/corelib/plugin/qlibrary_win.cpp

@@ -104,7 +104,7 @@ bool QLibraryPrivate::load_sys()
         attempts.prepend(QDir::rootPath() + fileName);
 #endif
 
-    Q_FOREACH (const QString &attempt, attempts) {
+    for (const QString &attempt : qAsConst(attempts)) {
 #ifndef Q_OS_WINRT
         pHnd = LoadLibrary((wchar_t*)QDir::toNativeSeparators(attempt).utf16());
 #else // Q_OS_WINRT

src/corelib/plugin/qpluginloader.cpp

@@ -300,9 +300,9 @@ static QString locatePlugin(const QString& fileName)
         paths.prepend(QStringLiteral(".")); // search in current dir first
     }
 
-    foreach (const QString &path, paths) {
+    for (const QString &path : qAsConst(paths)) {
-        foreach (const QString &prefix, prefixes) {
+        for (const QString &prefix : qAsConst(prefixes)) {
-            foreach (const QString &suffix, suffixes) {
+            for (const QString &suffix : qAsConst(suffixes)) {
                 const QString fn = path + QLatin1Char('/') + basePath + prefix + baseName + suffix;
                 if (debug)
                     qDebug() << "Trying..." << fn;

src/corelib/thread/qthreadpool.cpp

@@ -263,7 +263,7 @@ void QThreadPoolPrivate::reset()
         allThreadsCopy.swap(allThreads);
         locker.unlock();
 
-        foreach (QThreadPoolThread *thread, allThreadsCopy) {
+        for (QThreadPoolThread *thread : qAsConst(allThreadsCopy)) {
             thread->runnableReady.wakeAll();
             thread->wait();
             delete thread;