loplugin:useuniqueptr in E3dView

Change-Id: I2945d810a05f0f9d44ac17c20f5a82e05bd4981e
Reviewed-on: https://gerrit.libreoffice.org/53712Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/svx/view3d.hxx

@@ -25,6 +25,7 @@
 #include <svx/deflt3d.hxx>
 #include <basegfx/point/b2dpoint.hxx>
 #include <svx/svxdllapi.h>
+#include <memory>
 
 /*
  * Forward declarations
@@ -49,7 +50,7 @@ protected:
     E3dDragConstraint           eDragConstraint;
 
     // Migrate selections
-    Impl3DMirrorConstructOverlay*                   mpMirrorOverlay;
+    std::unique_ptr<Impl3DMirrorConstructOverlay> mpMirrorOverlay;
 
     void InitView();
 

svx/source/engine3d/view3d.cxx

@@ -1395,7 +1395,7 @@ void E3dView::Start3DCreation()
 
     // Show mirror polygon IMMEDIATELY
     const SdrHdlList &aHdlList = GetHdlList();
-    mpMirrorOverlay = new Impl3DMirrorConstructOverlay(*this);
+    mpMirrorOverlay.reset(new Impl3DMirrorConstructOverlay(*this));
     mpMirrorOverlay->SetMirrorAxis(aHdlList.GetHdl(SdrHdlKind::Ref1)->GetPos(), aHdlList.GetHdl(SdrHdlKind::Ref2)->GetPos());
 }
 
@@ -1485,11 +1485,7 @@ E3dView::~E3dView ()
 
 void E3dView::ResetCreationActive ()
 {
-    if(mpMirrorOverlay)
-    {
-        delete mpMirrorOverlay;
-        mpMirrorOverlay = nullptr;
-    }
+    mpMirrorOverlay.reset();
 }
 
 void E3dView::InitView ()