TaskTree: Introduce DoneResult, use it for Sync setup

Instead of using ambiguous bool.

Change-Id: Iec45b920a839ac3383abc2d0676e5834f282dddf
Reviewed-by: hjk <hjk@qt.io>

src/libs/solutions/tasking/tasktree.h

@@ -159,6 +159,13 @@ enum class SetupResult
 };
 Q_ENUM_NS(SetupResult);
 
+enum class DoneResult
+{
+    Success,
+    Error
+};
+Q_ENUM_NS(DoneResult);
+
 enum class DoneWith
 {
     Success,
@@ -374,15 +381,15 @@ public:
 private:
     template <typename Handler>
     static GroupSetupHandler wrapHandler(Handler &&handler) {
-        // B, V stands for: [B]ool, [V]oid
-        static constexpr bool isB = isInvocable<bool, Handler>();
+        // D, V stands for: [D]oneResult, [V]oid
+        static constexpr bool isB = isInvocable<DoneResult, Handler>();
         static constexpr bool isV = isInvocable<void, Handler>();
         static_assert(isB || isV,
-            "Sync handler needs to take no arguments and has to return void or bool. "
+            "Sync handler needs to take no arguments and has to return void or DoneResult. "
             "The passed handler doesn't fulfill these requirements.");
         return [=] {
             if constexpr (isB) {
-                return std::invoke(handler) ? SetupResult::StopWithSuccess
+                return std::invoke(handler) == DoneResult::Success ? SetupResult::StopWithSuccess
                                                                    : SetupResult::StopWithError;
             }
             std::invoke(handler);

src/plugins/cppeditor/cppincludesfilter.cpp

@@ -59,7 +59,7 @@ CppIncludesFilter::CppIncludesFilter()
     setDefaultShortcutString("ai");
     setDefaultIncludedByDefault(true);
     const auto invalidate = [this] { m_cache.invalidate(); };
-    setRefreshRecipe(Tasking::Sync([invalidate] { invalidate(); return true; }));
+    setRefreshRecipe(Tasking::Sync([invalidate] { invalidate(); }));
     setPriority(ILocatorFilter::Low);
 
     connect(ProjectExplorerPlugin::instance(), &ProjectExplorerPlugin::fileListChanged,

src/plugins/nim/project/nimcompilercleanstep.cpp

@@ -63,19 +63,19 @@ GroupItem NimCompilerCleanStep::runRecipe()
         if (!m_buildDir.exists()) {
             emit addOutput(Tr::tr("Build directory \"%1\" does not exist.")
                                .arg(m_buildDir.toUserOutput()), OutputFormat::ErrorMessage);
-            return false;
+            return DoneResult::Error;
         }
         if (!removeCacheDirectory()) {
             emit addOutput(Tr::tr("Failed to delete the cache directory."),
                            OutputFormat::ErrorMessage);
-            return false;
+            return DoneResult::Error;
         }
         if (!removeOutFilePath()) {
             emit addOutput(Tr::tr("Failed to delete the out file."), OutputFormat::ErrorMessage);
-            return false;
+            return DoneResult::Error;
         }
         emit addOutput(Tr::tr("Clean step completed successfully."), OutputFormat::NormalMessage);
-        return true;
+        return DoneResult::Success;
     };
     return Sync(onSetup);
 }

tests/auto/solutions/tasking/tst_tasking.cpp

@@ -397,6 +397,11 @@ static Handler doneToTweakHandler(bool result)
     return result ? Handler::TweakDoneToSuccess : Handler::TweakDoneToError;
 }
 
+static Handler doneToTweakHandler(DoneResult result)
+{
+    return result == DoneResult::Success ? Handler::TweakDoneToSuccess : Handler::TweakDoneToError;
+}
+
 static TestData storageShadowing()
 {
     // This test check if storage shadowing works OK.
@@ -555,11 +560,11 @@ void tst_Tasking::testTree_data()
     const auto createSync = [storage](int taskId) {
         return Sync([storage, taskId] { storage->m_log.append({taskId, Handler::Sync}); });
     };
-    const auto createSyncWithTweak = [storage](int taskId, bool desiredResult) {
-        return Sync([storage, taskId, desiredResult] {
+    const auto createSyncWithTweak = [storage](int taskId, DoneResult result) {
+        return Sync([storage, taskId, result] {
             storage->m_log.append({taskId, Handler::Sync});
-            storage->m_log.append({taskId, doneToTweakHandler(desiredResult)});
-            return desiredResult;
+            storage->m_log.append({taskId, doneToTweakHandler(result)});
+            return result;
         });
     };
 
@@ -2083,11 +2088,11 @@ void tst_Tasking::testTree_data()
     {
         const Group root {
             Storage(storage),
-            createSyncWithTweak(1, true),
-            createSyncWithTweak(2, true),
-            createSyncWithTweak(3, true),
-            createSyncWithTweak(4, true),
-            createSyncWithTweak(5, true)
+            createSyncWithTweak(1, DoneResult::Success),
+            createSyncWithTweak(2, DoneResult::Success),
+            createSyncWithTweak(3, DoneResult::Success),
+            createSyncWithTweak(4, DoneResult::Success),
+            createSyncWithTweak(5, DoneResult::Success)
         };
         const Log log {
             {1, Handler::Sync},
@@ -2130,7 +2135,7 @@ void tst_Tasking::testTree_data()
             parallel,
             createSync(1),
             createSync(2),
-            createSyncWithTweak(3, false),
+            createSyncWithTweak(3, DoneResult::Error),
             createSync(4),
             createSync(5)
         };
@@ -2171,7 +2176,7 @@ void tst_Tasking::testTree_data()
             Storage(storage),
             createSync(1),
             createSuccessTask(2),
-            createSyncWithTweak(3, false),
+            createSyncWithTweak(3, DoneResult::Error),
             createSuccessTask(4),
             createSync(5),
             groupDone(0)