starmath: Manage SmEditAccessible's pTextHelper via std::unique_ptr

Change-Id: Iefd4314823efec28a8497b5a993fdd01ed12811e
Reviewed-on: https://gerrit.libreoffice.org/20849Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>

starmath/source/accessibility.cxx

@@ -1601,7 +1601,7 @@ bool SmEditViewForwarder::Paste()
 
 SmEditAccessible::SmEditAccessible( SmEditWindow *pEditWin ) :
     aAccName            (SM_RESSTR(STR_CMDBOXWINDOW)),
-    pTextHelper         (nullptr),
+    pTextHelper         (),
     pWin                (pEditWin)
 {
     OSL_ENSURE( pWin, "SmEditAccessible: window missing" );
@@ -1609,7 +1609,11 @@ SmEditAccessible::SmEditAccessible( SmEditWindow *pEditWin ) :
 
 SmEditAccessible::~SmEditAccessible()
 {
-    delete pTextHelper;
+}
+
+::accessibility::AccessibleTextHelper *SmEditAccessible::GetTextHelper()
+{
+    return pTextHelper.get();
 }
 
 void SmEditAccessible::Init()
@@ -1623,7 +1627,8 @@ void SmEditAccessible::Init()
         {
             ::std::unique_ptr< SvxEditSource > pEditSource(
                     new SmEditSource( pWin, *this ) );
-            pTextHelper = new ::accessibility::AccessibleTextHelper( std::move(pEditSource) );
+            assert(!pTextHelper);
+            pTextHelper.reset(new ::accessibility::AccessibleTextHelper( std::move(pEditSource) ));
             pTextHelper->SetEventSource( this );
         }
     }
@@ -1644,7 +1649,7 @@ void SmEditAccessible::ClearWin()
     //! make TextHelper release references
     //! (e.g. the one set by the 'SetEventSource' call)
     pTextHelper->Dispose();
-    delete pTextHelper;     pTextHelper = nullptr;
+    pTextHelper.reset();
 }
 
 // XAccessible

starmath/source/accessibility.hxx

@@ -37,6 +37,7 @@
 #include <editeng/unoedsrc.hxx>
 #include <svx/AccessibleTextHelper.hxx>
 #include <edit.hxx>
+#include <memory>
 
 class SmGraphicWindow;
 class SmEditWindow;
@@ -314,7 +315,7 @@ class SmEditAccessible :
     public SmEditAccessibleBaseClass
 {
     OUString                                aAccName;
-    ::accessibility::AccessibleTextHelper    *pTextHelper;
+    std::unique_ptr<::accessibility::AccessibleTextHelper> pTextHelper;
     VclPtr<SmEditWindow>                    pWin;
 
     SmEditAccessible( const SmEditAccessible & ) = delete;
@@ -324,7 +325,7 @@ public:
     explicit SmEditAccessible( SmEditWindow *pEditWin );
     virtual ~SmEditAccessible();
 
-    ::accessibility::AccessibleTextHelper *   GetTextHelper() { return pTextHelper; }
+    ::accessibility::AccessibleTextHelper *   GetTextHelper();
 
     void                Init();
     void                ClearWin();     // to be called when view is destroyed