loplugin:useuniqueptr in HuffmanTreeNode

Change-Id: I30655c5ad44c93968ec39938ced9854105a831dd
Reviewed-on: https://gerrit.libreoffice.org/50716Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

lotuswordpro/source/filter/explode.cxx

@@ -459,16 +459,6 @@ HuffmanTreeNode::HuffmanTreeNode(sal_uInt32 nValue )
 }
 HuffmanTreeNode::~HuffmanTreeNode()
 {
-    if (left)
-    {
-        delete left;
-        left = nullptr;
-    }
-    if (right)
-    {
-        delete right;
-        right = nullptr;
-    }
 }
 
 HuffmanTreeNode * HuffmanTreeNode::InsertNode(sal_uInt32 nValue, const sal_Char * pInCode)
@@ -485,9 +475,9 @@ HuffmanTreeNode * HuffmanTreeNode::InsertNode(sal_uInt32 nValue, const sal_Char
         pParent = InsertNode(0xffffffff, aCode.c_str());
     }
     if (cLast == '0')
-        pParent->left = pNew;
+        pParent->left.reset(pNew);
     else // (cChar == '1')
-        pParent->right = pNew;
+        pParent->right.reset(pNew);
 
     return pNew;
 }
@@ -502,11 +492,11 @@ HuffmanTreeNode * HuffmanTreeNode::QueryNode(const sal_Char * pCode)
         sal_Char cChar= pCode[i];
         if (cChar == '0')
         {
-            pNode = pNode->left;
+            pNode = pNode->left.get();
         }
         else // (cChar == '1')
         {
-            pNode = pNode->right;
+            pNode = pNode->right.get();
         }
     }
     return pNode;

lotuswordpro/source/filter/explode.hxx

@@ -57,14 +57,15 @@
 #define INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_EXPLODE_HXX
 
 #include <sal/types.h>
+#include <memory>
 
 class SvStream;
 
 class HuffmanTreeNode
 {
 public:
-    HuffmanTreeNode * left;
-    HuffmanTreeNode * right;
+    std::unique_ptr<HuffmanTreeNode> left;
+    std::unique_ptr<HuffmanTreeNode> right;
     sal_uInt32 value;
 
     explicit HuffmanTreeNode(sal_uInt32 value = 0xffffffff) ;