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, 67 insertions, 0 deletions

diff --git a/tests/auto/qtconcurrentrun/tst_qtconcurrentrun.cpp b/tests/auto/qtconcurrentrun/tst_qtconcurrentrun.cpp
index e4e9479a13..cacb09aae1 100644
--- a/tests/auto/qtconcurrentrun/tst_qtconcurrentrun.cpp
+++ b/tests/auto/qtconcurrentrun/tst_qtconcurrentrun.cpp
@@ -67,6 +67,8 @@ private slots:
 #if 0
     void createFunctor();
 #endif
+    void functor();
+    void lambda();
 };
 
 #if 0
@@ -444,6 +446,71 @@ void tst_QtConcurrentRun::createFunctor()
 }
 #endif
 
+struct Functor {
+    int operator()() { return 42; }
+    double operator()(double a, double b) { return a/b; }
+    int operator()(int a, int b) { return a/b; }
+    void operator()(int) { }
+    void operator()(int, int, int) { }
+    void operator()(int, int, int, int) { }
+    void operator()(int, int, int, int, int) { }
+    void operator()(int, int, int, int, int, int) { }
+};
+
+void tst_QtConcurrentRun::functor()
+{
+    //this test functor without result_type,  decltype need to be supported by the compiler
+#ifndef Q_COMPILER_DECLTYPE
+    QSKIP("Compiler do not suport decltype", SkipAll);
+#else
+    Functor f;
+    {
+        QFuture<int> fut = QtConcurrent::run(f);
+        QCOMPARE(fut.result(), 42);
+    }
+    {
+        QFuture<double> fut = QtConcurrent::run(f, 8.5, 1.8);
+        QCOMPARE(fut.result(), (8.5/1.8));
+    }
+    {
+        QFuture<int> fut = QtConcurrent::run(f, 19, 3);
+        QCOMPARE(fut.result(), int(19/3));
+    }
+    {
+        QtConcurrent::run(f, 1).waitForFinished();
+        QtConcurrent::run(f, 1,2).waitForFinished();
+        QtConcurrent::run(f, 1,2,3).waitForFinished();
+        QtConcurrent::run(f, 1,2,3,4).waitForFinished();
+        QtConcurrent::run(f, 1,2,3,4,5).waitForFinished();
+    }
+#endif
+}
+
+
+void tst_QtConcurrentRun::lambda()
+{
+#ifndef Q_COMPILER_LAMBDA
+    QSKIP("Compiler do not suport lambda", SkipAll);
+#else
+
+    QCOMPARE(QtConcurrent::run([](){ return 45; }).result(), 45);
+    QCOMPARE(QtConcurrent::run([](int a){ return a+15; }, 12).result(), 12+15);
+    QCOMPARE(QtConcurrent::run([](int a, double b){ return a + b; }, 12, 15).result(), double(12+15));
+    QCOMPARE(QtConcurrent::run([](int a , int, int, int, int b){ return a + b; }, 1, 2, 3, 4, 5).result(), 1 + 5);
+
+#ifdef Q_COMPILER_INITIALIZER_LISTS
+    {
+        QString str { "Hello World Foo" };
+        QFuture<QStringList> f1 = QtConcurrent::run([&](){ return str.split(' '); });
+        auto r = f1.result();
+        QCOMPARE(r, QStringList({"Hello", "World", "Foo"}));
+    }
+#endif
+
+#endif
+}
+
+
 #include "tst_qtconcurrentrun.moc"
 
 #else