Doc: Compile QQuaternion snippets

Change-Id: Ica53a7307c3e77abeffa616db15c8e8ec39fce8f
Done-with: Nico Vertriest <nico.vertriest@qt.io>
Task-number: QTBUG-81486
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/gui/doc/snippets/code/code.pro

@@ -20,4 +20,5 @@ SOURCES = \
     src_gui_kernel_qguiapplication.cpp \
     src_gui_kernel_qguiapplication_x11.cpp \
     src_gui_kernel_qkeysequence.cpp \
-    src_gui_kernel_qshortcutmap.cpp
+    src_gui_kernel_qshortcutmap.cpp \
+    src_gui_math3d_qquaternion.cpp

src/gui/doc/snippets/code/src_gui_math3d_qquaternion.cpp

@@ -47,11 +47,29 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#include <QQuaternion>
+#include <QVector3D>
+
+
+namespace src_gui_math3d_qquaternion {
+QQuaternion q;
+QVector3D vector;
+void wrapper0() {
 
 //! [0]
-    QVector3D result = q.rotatedVector(vector);
+QVector3D result = q.rotatedVector(vector);
 //! [0]
 
+Q_UNUSED(result);
+} // wrapper0
+
+
+void wrapper1() {
+
 //! [1]
-    QVector3D result = (q * QQuaternion(0, vector) * q.conjugated()).vector();
+QVector3D result = (q * QQuaternion(0, vector) * q.conjugated()).vector();
 //! [1]
+
+Q_UNUSED(result);
+} // wrapper1
+} // src_gui_math3d_qquaternion