Runextensions/hasCallOperator: Fix build with MSVC2015 Update 2

Looks like MSVC has issues (internal compiler error) with the "templates
in templates" when used from within a namespace, as well as a few other
problems...

Simplify the code paths for hasCallOperator.

Change-Id: I934401a884398967ac95d7e218525cc316d9000a
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@theqtcompany.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/libs/utils/runextensions.h

@@ -38,6 +38,24 @@
 
 #include <functional>
 
+// hasCallOperator & Co must be outside of any namespace
+// because of internal compiler error with MSVC2015 Update 2
+
+using testCallOperatorYes = char;
+using testCallOperatorNo = struct { char foo[2]; };
+
+template<typename C>
+static testCallOperatorYes testCallOperator(decltype(&C::operator()));
+
+template<typename>
+static testCallOperatorNo testCallOperator(...);
+
+template<typename T>
+struct hasCallOperator
+{
+    static const bool value = (sizeof(testCallOperator<T>(0)) == sizeof(testCallOperatorYes));
+};
+
 namespace Utils {
 namespace Internal {
 
@@ -54,21 +72,6 @@ namespace Internal {
    a QFutureInterface& as its first parameter and returns void.
 */
 
-template<typename T>
-struct hasCallOperator
-{
-    using yes = char;
-    using no = struct { char foo[2]; };
-
-    template<typename C>
-    static yes test(decltype(&C::operator()));
-
-    template<typename C>
-    static no test(...);
-
-    static const bool value = (sizeof(test<T>(0)) == sizeof(yes));
-};
-
 template <typename Function>
 struct resultType;
 

src/plugins/texteditor/generichighlighter/manager.cpp

@@ -248,35 +248,16 @@ bool Manager::isBuildingDefinition(const QString &id) const
     return m_isBuildingDefinition.contains(id);
 }
 
-class ManagerProcessor
-{
-public:
-    ManagerProcessor();
-    // TODO: make move-only when we can require MSVC2015
+static const int kMaxProgress = 200;
 
-    void operator()(QFutureInterface<Manager::RegisterData> &future);
-
-    QStringList m_definitionsPaths;
-    static const int kMaxProgress;
-};
-
-const int ManagerProcessor::kMaxProgress = 200;
-
-ManagerProcessor::ManagerProcessor()
-{
-    const HighlighterSettings &settings = TextEditorSettings::highlighterSettings();
-    m_definitionsPaths.append(settings.definitionFilesPath());
-    if (settings.useFallbackLocation())
-        m_definitionsPaths.append(settings.fallbackDefinitionFilesPath());
-}
-
-void ManagerProcessor::operator()(QFutureInterface<Manager::RegisterData> &future)
+static void processHighlightingFiles(QFutureInterface<Manager::RegisterData> &future,
+                                     QStringList definitionPaths)
 {
     future.setProgressRange(0, kMaxProgress);
 
     Manager::RegisterData data;
     // iterate through paths in order, high priority > low priority
-    foreach (const QString &path, m_definitionsPaths) {
+    foreach (const QString &path, definitionPaths) {
         if (path.isEmpty())
             continue;
 
@@ -322,7 +303,13 @@ void Manager::registerHighlightingFiles()
     if (!m_registeringWatcher.isRunning()) {
         clear();
 
-        QFuture<RegisterData> future = Utils::runAsync(ManagerProcessor());
+        QStringList definitionsPaths;
+        const HighlighterSettings &settings = TextEditorSettings::highlighterSettings();
+        definitionsPaths.append(settings.definitionFilesPath());
+        if (settings.useFallbackLocation())
+            definitionsPaths.append(settings.fallbackDefinitionFilesPath());
+
+        QFuture<RegisterData> future = Utils::runAsync(processHighlightingFiles, definitionsPaths);
         m_registeringWatcher.setFuture(future);
     } else {
         m_hasQueuedRegistration = true;

src/plugins/texteditor/generichighlighter/manager.h

@@ -80,6 +80,12 @@ public:
 
     static DefinitionMetaDataPtr parseMetadata(const QFileInfo &fileInfo);
 
+    struct RegisterData
+    {
+        QHash<QString, QString> m_idByName;
+        QHash<QString, QString> m_idByMimeType;
+        QHash<QString, DefinitionMetaDataPtr> m_definitionsMetaData;
+    };
 private:
     void registerHighlightingFilesFinished();
     void downloadAvailableDefinitionsListFinished();
@@ -100,12 +106,6 @@ private:
     QHash<QString, QSharedPointer<HighlightDefinition> > m_definitions;
     QHash<QString, DefinitionMetaDataPtr> m_availableDefinitions;
 
-    struct RegisterData
-    {
-        QHash<QString, QString> m_idByName;
-        QHash<QString, QString> m_idByMimeType;
-        QHash<QString, DefinitionMetaDataPtr> m_definitionsMetaData;
-    };
     RegisterData m_register;
     bool m_hasQueuedRegistration;
     QFutureWatcher<RegisterData> m_registeringWatcher;