Finish qmetatype migration to type switcher

The matatype should not keep manually maintained list of stream
operators. The patch adds automatic detection for all builtin types
so load and save functions pick the right delegate automatically.

This change exposed some existing anomalies:
 - char is enforced to be signed while it seems that just calling
 the operator directly does not have that feature.
 - [unsigned] long type is always upgraded to [unsigned] long long
 - QCborSimpleType doesn't have the data stream operators while
 metatype is able to stream it through casting

Change-Id: I51178d6acd97d0585a6089e30ddd6acb2a29af54
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/auto/widgets/kernel/qwidgetmetatype/tst_qwidgetmetatype.cpp b/tests/auto/widgets/kernel/qwidgetmetatype/tst_qwidgetmetatype.cpp
index 077e8de328..06522b2bd3 100644
--- a/tests/auto/widgets/kernel/qwidgetmetatype/tst_qwidgetmetatype.cpp
+++ b/tests/auto/widgets/kernel/qwidgetmetatype/tst_qwidgetmetatype.cpp
@@ -41,6 +41,8 @@ public:
 
 private slots:
     void metaObject();
+    void saveAndLoadBuiltin_data();
+    void saveAndLoadBuiltin();
 };
 
 class CustomWidget : public QWidget
@@ -68,5 +70,50 @@ void tst_QWidgetMetaType::metaObject()
     QCOMPARE(QMetaType::metaObjectForType(qMetaTypeId<QSizePolicy>()), &QSizePolicy::staticMetaObject);
 }
 
+template <typename T>
+struct StreamingTraits
+{
+    // Streamable by default, as currently all widgets built-in types are streamable
+    enum { isStreamable = 1 };
+};
+
+void tst_QWidgetMetaType::saveAndLoadBuiltin_data()
+{
+    QTest::addColumn<int>("type");
+    QTest::addColumn<bool>("isStreamable");
+
+#define ADD_METATYPE_TEST_ROW(MetaTypeName, MetaTypeId, RealType) \
+    QTest::newRow(#RealType) << MetaTypeId << bool(StreamingTraits<RealType>::isStreamable);
+    QT_FOR_EACH_STATIC_WIDGETS_CLASS(ADD_METATYPE_TEST_ROW)
+#undef ADD_METATYPE_TEST_ROW
+}
+
+void tst_QWidgetMetaType::saveAndLoadBuiltin()
+{
+    QFETCH(int, type);
+    QFETCH(bool, isStreamable);
+
+    void *value = QMetaType::create(type);
+
+    QByteArray ba;
+    QDataStream stream(&ba, QIODevice::ReadWrite);
+    QCOMPARE(QMetaType::save(stream, type, value), isStreamable);
+    QCOMPARE(stream.status(), QDataStream::Ok);
+
+    if (isStreamable)
+        QVERIFY(QMetaType::load(stream, type, value));
+
+    stream.device()->seek(0);
+    stream.resetStatus();
+    QCOMPARE(QMetaType::load(stream, type, value), isStreamable);
+    QCOMPARE(stream.status(), QDataStream::Ok);
+
+    if (isStreamable)
+        QVERIFY(QMetaType::load(stream, type, value));
+
+    QMetaType::destroy(type, value);
+}
+
+
 QTEST_MAIN(tst_QWidgetMetaType)
 #include "tst_qwidgetmetatype.moc"