add move operators for VclPtr

Change-Id: Ic32894d13aac2d8038afec2efebcc544f1c408af
Reviewed-on: https://gerrit.libreoffice.org/30748
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/vclptr.hxx

@@ -101,6 +101,13 @@ public:
         : m_rInnerRef (handle.m_rInnerRef)
     {}
 
+    /** Move constructor...
+     */
+    inline VclPtr (VclPtr<reference_type> && handle)
+        : m_rInnerRef ( std::move(handle.m_rInnerRef) )
+    {
+    }
+
     /** Up-casting conversion constructor: Copies interface reference.
 
         Does not work for up-casts to ambiguous bases.  For the special case of
@@ -157,7 +164,7 @@ public:
         m_rInnerRef.set(pBody);
     }
 
-    /** Up-casting assignment operator.
+    /** Up-casting copy assignment operator.
 
         Does not work for up-casts to ambiguous bases.
 
@@ -173,6 +180,22 @@ public:
         return *this;
     }
 
+    /** move assignment operator.
+    */
+    VclPtr & operator =(VclPtr<reference_type> && rRef)
+    {
+        m_rInnerRef = std::move(rRef);
+        return *this;
+    }
+
+    /** copy assignment operator.
+    */
+    VclPtr & operator =(const VclPtr<reference_type> & rRef)
+    {
+        m_rInnerRef = rRef;
+        return *this;
+    }
+
     VclPtr & operator =(reference_type * pBody)
     {
         m_rInnerRef.set(pBody);