refs #314, samples for Variant tests, fixed some minor things in other samples

samples/blackmisc/samplesvariant.cpp

@@ -0,0 +1,62 @@
+/* Copyright (C) 2013
+ * swift Project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of Swift Project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "samplesvariant.h"
+#include "blackmisc/pqallquantities.h"
+#include "blackmisc/avallclasses.h"
+#include "blackmisc/blackmiscfreefunctions.h"
+#include <QDebug>
+#include <QMetaType>
+
+using namespace BlackMisc::PhysicalQuantities;
+using namespace BlackMisc::Aviation;
+
+namespace BlackMiscTest
+{
+
+    int CSamplesVariant::samples()
+    {
+        BlackMisc::registerMetadata();
+
+        CAngle a1(30.0, CAngleUnit::deg());
+        QVariant qva = a1.toQVariant();
+        qDebug() << a1 << qva.userType();
+
+        CHeading h1(45, CHeading::True, CAngleUnit::deg());
+        CHeading h2(60, CHeading::True, CAngleUnit::deg());
+
+        QVariant qvh = h1.toQVariant();
+        qDebug() << h1 << qvh.userType();
+
+        CAngle *ap_heading = &h1; // angle actually heading
+        CAngle *ap_angle = &a1;   // angle really heading
+        qDebug() << (*ap_heading) << ap_heading->toQVariant().userType();
+        qDebug() << (*ap_angle) << ap_angle->toQVariant().userType();
+
+        // This works, because ap is actually heading
+        ap_heading->fromQVariant(h2.toQVariant());
+        qDebug() << (*ap_heading) << ap_heading->toQVariant().userType();
+
+        // This works, angle from variant angle
+        ap_angle->fromQVariant(a1.toQVariant());
+        qDebug() << (*ap_angle) << ap_angle->toQVariant().userType();
+
+        // This gives me an unwanted(!) assert, canConvert is not smart enough to detect upcasting
+        // because CValueObjects are not QObjects
+        ap_angle->fromQVariant(h2.toQVariant());
+        qDebug() << (*ap_angle) << ap_angle->toQVariant().userType();
+
+        // This gives me the intended assert, because I assign angle to heading
+        ap_heading->fromQVariant(a1.toQVariant());
+        qDebug() << (*ap_heading) << ap_heading->toQVariant().userType();
+
+        return 0;
+    }
+
+} // namespace