Support of lambdas in QtConcurrent::run

Reviewed-by: Joao
(cherry picked from commit 917f2ff617209bcc283eb3590b422bcf239c0537)
Change-Id: I837f18f043b18410c1d93b9f1156acf729dad510
Reviewed-on: http://codereview.qt.nokia.com/142
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>

1 files changed, 63 insertions, 12 deletions

diff --git a/src/corelib/concurrent/qtconcurrentrun.h b/src/corelib/concurrent/qtconcurrentrun.h
index 8611fba361..ef51b2adcb 100644
--- a/src/corelib/concurrent/qtconcurrentrun.h
+++ b/src/corelib/concurrent/qtconcurrentrun.h
@@ -71,63 +71,114 @@ namespace QtConcurrent {
 template <typename T>
 QFuture<T> run(T (*functionPointer)())
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall0<T, T (*)()>::type(functionPointer))->start();
+    return (new StoredFunctorCall0<T, T (*)()>(functionPointer))->start();
 }
 template <typename T, typename Param1, typename Arg1>
 QFuture<T> run(T (*functionPointer)(Param1), const Arg1 &arg1)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall1<T, T (*)(Param1), Arg1>::type(functionPointer, arg1))->start();
+    return (new StoredFunctorCall1<T, T (*)(Param1), Arg1>(functionPointer, arg1))->start();
 }
 template <typename T, typename Param1, typename Arg1, typename Param2, typename Arg2>
 QFuture<T> run(T (*functionPointer)(Param1, Param2), const Arg1 &arg1, const Arg2 &arg2)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall2<T, T (*)(Param1, Param2), Arg1, Arg2>::type(functionPointer, arg1, arg2))->start();
+    return (new StoredFunctorCall2<T, T (*)(Param1, Param2), Arg1, Arg2>(functionPointer, arg1, arg2))->start();
 }
 template <typename T, typename Param1, typename Arg1, typename Param2, typename Arg2, typename Param3, typename Arg3>
 QFuture<T> run(T (*functionPointer)(Param1, Param2, Param3), const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall3<T, T (*)(Param1, Param2, Param3), Arg1, Arg2, Arg3>::type(functionPointer, arg1, arg2, arg3))->start();
+    return (new StoredFunctorCall3<T, T (*)(Param1, Param2, Param3), Arg1, Arg2, Arg3>(functionPointer, arg1, arg2, arg3))->start();
 }
 template <typename T, typename Param1, typename Arg1, typename Param2, typename Arg2, typename Param3, typename Arg3, typename Param4, typename Arg4>
 QFuture<T> run(T (*functionPointer)(Param1, Param2, Param3, Param4), const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall4<T, T (*)(Param1, Param2, Param3, Param4), Arg1, Arg2, Arg3, Arg4>::type(functionPointer, arg1, arg2, arg3, arg4))->start();
+    return (new StoredFunctorCall4<T, T (*)(Param1, Param2, Param3, Param4), Arg1, Arg2, Arg3, Arg4>(functionPointer, arg1, arg2, arg3, arg4))->start();
 }
 template <typename T, typename Param1, typename Arg1, typename Param2, typename Arg2, typename Param3, typename Arg3, typename Param4, typename Arg4, typename Param5, typename Arg5>
 QFuture<T> run(T (*functionPointer)(Param1, Param2, Param3, Param4, Param5), const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4, const Arg5 &arg5)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall5<T, T (*)(Param1, Param2, Param3, Param4, Param5), Arg1, Arg2, Arg3, Arg4, Arg5>::type(functionPointer, arg1, arg2, arg3, arg4, arg5))->start();
+    return (new StoredFunctorCall5<T, T (*)(Param1, Param2, Param3, Param4, Param5), Arg1, Arg2, Arg3, Arg4, Arg5>(functionPointer, arg1, arg2, arg3, arg4, arg5))->start();
 }
 
+#ifdef Q_COMPILER_DECLTYPE
+
+template <typename Functor>
+auto run(Functor functor) -> typename QtPrivate::QEnableIf<!QtPrivate::HasResultType<Functor>::Value, QFuture<decltype(functor())> >::Type
+{
+    typedef decltype(functor()) result_type;
+    return (new StoredFunctorCall0<result_type, Functor>(functor))->start();
+}
+
+template <typename Functor, typename Arg1>
+auto run(Functor functor, const Arg1 &arg1)
+    -> typename QtPrivate::QEnableIf<!QtPrivate::HasResultType<Functor>::Value, QFuture<decltype(functor(arg1))> >::Type
+{
+    typedef decltype(functor(arg1)) result_type;
+    return (new StoredFunctorCall1<result_type, Functor, Arg1>(functor, arg1))->start();
+}
+
+template <typename Functor, typename Arg1, typename Arg2>
+auto run(Functor functor, const Arg1 &arg1, const Arg2 &arg2)
+    -> typename QtPrivate::QEnableIf<!QtPrivate::HasResultType<Functor>::Value, QFuture<decltype(functor(arg1, arg2))> >::Type
+{
+    typedef decltype(functor(arg1, arg2)) result_type;
+    return (new StoredFunctorCall2<result_type, Functor, Arg1, Arg2>(functor, arg1, arg2))->start();
+}
+
+template <typename Functor, typename Arg1, typename Arg2, typename Arg3>
+auto run(Functor functor, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3)
+    -> typename QtPrivate::QEnableIf<!QtPrivate::HasResultType<Functor>::Value, QFuture<decltype(functor(arg1, arg2, arg3))> >::Type
+{
+    typedef decltype(functor(arg1, arg2, arg3)) result_type;
+    return (new StoredFunctorCall3<result_type, Functor, Arg1, Arg2, Arg3>(functor, arg1, arg2, arg3))->start();
+}
+
+template <typename Functor, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+auto run(Functor functor, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4)
+    -> typename QtPrivate::QEnableIf<!QtPrivate::HasResultType<Functor>::Value, QFuture<decltype(functor(arg1, arg2, arg3, arg4))> >::Type
+{
+    typedef decltype(functor(arg1, arg2, arg3, arg4)) result_type;
+    return (new StoredFunctorCall4<result_type, Functor, Arg1, Arg2, Arg3, Arg4>(functor, arg1, arg2, arg3, arg4))->start();
+}
+
+template <typename Functor, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5>
+auto run(Functor functor, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4, const Arg5 &arg5)
+    -> typename QtPrivate::QEnableIf<!QtPrivate::HasResultType<Functor>::Value, QFuture<decltype(functor(arg1, arg2, arg3, arg4, arg5))> >::Type
+{
+    typedef decltype(functor(arg1, arg2, arg3, arg4, arg5)) result_type;
+    return (new StoredFunctorCall5<result_type, Functor, Arg1, Arg2, Arg3, Arg4, Arg5>(functor, arg1, arg2, arg3, arg4, arg5))->start();
+}
+
+#endif
+
 template <typename FunctionObject>
 QFuture<typename FunctionObject::result_type> run(FunctionObject functionObject)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall0<QT_TYPENAME FunctionObject::result_type, FunctionObject>::type(functionObject))->start();
+    return (new StoredFunctorCall0<QT_TYPENAME FunctionObject::result_type, FunctionObject>(functionObject))->start();
 }
 template <typename FunctionObject, typename Arg1>
 QFuture<typename FunctionObject::result_type> run(FunctionObject functionObject, const Arg1 &arg1)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall1<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1>::type(functionObject, arg1))->start();
+    return (new StoredFunctorCall1<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1>(functionObject, arg1))->start();
 }
 template <typename FunctionObject, typename Arg1, typename Arg2>
 QFuture<typename FunctionObject::result_type> run(FunctionObject functionObject, const Arg1 &arg1, const Arg2 &arg2)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall2<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2>::type(functionObject, arg1, arg2))->start();
+    return (new StoredFunctorCall2<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2>(functionObject, arg1, arg2))->start();
 }
 template <typename FunctionObject, typename Arg1, typename Arg2, typename Arg3>
 QFuture<typename FunctionObject::result_type> run(FunctionObject functionObject, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall3<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2, Arg3>::type(functionObject, arg1, arg2, arg3))->start();
+    return (new StoredFunctorCall3<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2, Arg3>(functionObject, arg1, arg2, arg3))->start();
 }
 template <typename FunctionObject, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
 QFuture<typename FunctionObject::result_type> run(FunctionObject functionObject, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall4<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2, Arg3, Arg4>::type(functionObject, arg1, arg2, arg3, arg4))->start();
+    return (new StoredFunctorCall4<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2, Arg3, Arg4>(functionObject, arg1, arg2, arg3, arg4))->start();
 }
 template <typename FunctionObject, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5>
 QFuture<typename FunctionObject::result_type> run(FunctionObject functionObject, const Arg1 &arg1, const Arg2 &arg2, const Arg3 &arg3, const Arg4 &arg4, const Arg5 &arg5)
 {
-    return (new QT_TYPENAME SelectStoredFunctorCall5<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2, Arg3, Arg4, Arg5>::type(functionObject, arg1, arg2, arg3, arg4, arg5))->start();
+    return (new StoredFunctorCall5<QT_TYPENAME FunctionObject::result_type, FunctionObject, Arg1, Arg2, Arg3, Arg4, Arg5>(functionObject, arg1, arg2, arg3, arg4, arg5))->start();
 }
 
 template <typename FunctionObject>