loplugin:useuniqueptr in ImplHomMatrixTemplate

Change-Id: I31175a5110672e864b07d6b5508b8b04b14e66ee
Reviewed-on: https://gerrit.libreoffice.org/58484
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

basegfx/source/inc/hommatrixtemplate.hxx

@@ -75,7 +75,7 @@ namespace basegfx
         template < sal_uInt16 RowSize > class ImplHomMatrixTemplate
         {
             ImplMatLine< RowSize >                          maLine[RowSize - 1];
-            ImplMatLine< RowSize >*                         mpLine;
+            std::unique_ptr<ImplMatLine< RowSize >> mutable mpLine;
 
         public:
             // Is last line used?
@@ -96,14 +96,12 @@ namespace basegfx
                 }
 
                 // reset last line, it equals default
-                delete const_cast<ImplHomMatrixTemplate< RowSize >*>(this)->mpLine;
-                const_cast<ImplHomMatrixTemplate< RowSize >*>(this)->mpLine = nullptr;
+                mpLine.reset();
 
                 return true;
             }
 
             ImplHomMatrixTemplate()
-                :   mpLine(nullptr)
             {
                 // complete initialization with identity matrix, all lines
                 // were initialized with a trailing 1 followed by 0's.
@@ -115,26 +113,22 @@ namespace basegfx
             }
 
             ImplHomMatrixTemplate(const ImplHomMatrixTemplate& rToBeCopied)
-                :   mpLine(nullptr)
+            {
+                operator=(rToBeCopied);
+            }
+
+            ImplHomMatrixTemplate& operator=(const ImplHomMatrixTemplate& rToBeCopied)
             {
                 // complete initialization using copy
                 for(sal_uInt16 a(0); a < (RowSize - 1); a++)
                 {
                     memcpy(&maLine[a], &rToBeCopied.maLine[a], sizeof(ImplMatLine< RowSize >));
                 }
-
                 if(rToBeCopied.mpLine)
                 {
-                    mpLine = new ImplMatLine< RowSize >((RowSize - 1), rToBeCopied.mpLine);
-                }
-            }
-
-            ~ImplHomMatrixTemplate()
-            {
-                if(mpLine)
-                {
-                    delete mpLine;
+                    mpLine.reset( new ImplMatLine< RowSize >((RowSize - 1), rToBeCopied.mpLine.get()) );
                 }
+                return *this;
             }
 
             static sal_uInt16 getEdgeLength() { return RowSize; }
@@ -170,7 +164,7 @@ namespace basegfx
 
                     if(!::basegfx::fTools::equal(fDefault, rValue))
                     {
-                        mpLine = new ImplMatLine< RowSize >((RowSize - 1), nullptr);
+                        mpLine.reset(new ImplMatLine< RowSize >((RowSize - 1), nullptr));
                         mpLine->set(nColumn, rValue);
                     }
                 }
@@ -195,8 +189,7 @@ namespace basegfx
 
                     if(!bNecessary)
                     {
-                        delete mpLine;
-                        mpLine = nullptr;
+                        mpLine.reset();
                     }
                 }
             }