QPromise: add support for addResult(braced-initializer)

The usual problem, the usual fix: default the addResult() template
argument to the class template argument, cf. e.g. wg21.link/p2218.

[ChangeLog][QtCore][QPromise] Added support for calls to addResult()
with braced initializers.

Fixes: QTBUG-111826
Change-Id: I9ad7294dbcefbc5d2609ca3d9e7304dbeb8b3f41
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp b/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp
index 6c23884b36..09332f92ef 100644
--- a/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp
+++ b/tests/auto/corelib/thread/qpromise/tst_qpromise.cpp
@@ -24,6 +24,7 @@ private slots:
     void promise();
     void futureFromPromise();
     void addResult();
+    void addResultWithBracedInitializer();
     void addResultOutOfOrder();
 #ifndef QT_NO_EXCEPTIONS
     void setException();
@@ -196,6 +197,20 @@ void tst_QPromise::addResult()
     }
 }
 
+void tst_QPromise::addResultWithBracedInitializer() // QTBUG-111826
+{
+    struct MyClass
+    {
+        QString strValue;
+        int intValue = 0;
+    };
+
+    {
+        QPromise<MyClass> myPromise;
+        myPromise.addResult({"bar", 1});
+    }
+}
+
 void tst_QPromise::addResultOutOfOrder()
 {
     // Compare results available in QFuture to expected results