Use unique_ptr for owned pointer

Author: nyalldawson

src/core/symbology/qgslegendsymbolitem.cpp

@@ -32,28 +32,22 @@ QgsLegendSymbolItem::QgsLegendSymbolItem( QgsSymbol *symbol, const QString &labe
 }
 
 QgsLegendSymbolItem::QgsLegendSymbolItem( const QgsLegendSymbolItem &other )
-
 {
   *this = other;
 }
 
-QgsLegendSymbolItem::~QgsLegendSymbolItem()
-{
-  delete mSymbol;
-  delete mDataDefinedSizeLegendSettings;
-}
+QgsLegendSymbolItem::~QgsLegendSymbolItem() = default;
 
 QgsLegendSymbolItem &QgsLegendSymbolItem::operator=( const QgsLegendSymbolItem &other )
 {
   if ( this == &other )
     return *this;
 
-  setSymbol( other.mSymbol );
+  mSymbol.reset( other.mSymbol ? other.mSymbol->clone() : nullptr );
   mLabel = other.mLabel;
   mKey = other.mKey;
   mCheckable = other.mCheckable;
-  delete mDataDefinedSizeLegendSettings;
-  mDataDefinedSizeLegendSettings = other.mDataDefinedSizeLegendSettings ? new QgsDataDefinedSizeLegend( *other.mDataDefinedSizeLegendSettings ) : nullptr;
+  mDataDefinedSizeLegendSettings.reset( other.mDataDefinedSizeLegendSettings ? new QgsDataDefinedSizeLegend( *other.mDataDefinedSizeLegendSettings ) : nullptr );
   mOriginalSymbolPointer = other.mOriginalSymbolPointer;
   mScaleMinDenom = other.mScaleMinDenom;
   mScaleMaxDenom = other.mScaleMaxDenom;
@@ -78,18 +72,16 @@ bool QgsLegendSymbolItem::isScaleOK( double scale ) const
 
 void QgsLegendSymbolItem::setSymbol( QgsSymbol *s )
 {
-  delete mSymbol;
-  mSymbol = s ? s->clone() : nullptr;
+  mSymbol.reset( s );
   mOriginalSymbolPointer = s;
 }
 
 void QgsLegendSymbolItem::setDataDefinedSizeLegendSettings( QgsDataDefinedSizeLegend *settings )
 {
-  delete mDataDefinedSizeLegendSettings;
-  mDataDefinedSizeLegendSettings = settings;
+  mDataDefinedSizeLegendSettings.reset( settings );
 }
 
 QgsDataDefinedSizeLegend *QgsLegendSymbolItem::dataDefinedSizeLegendSettings() const
 {
-  return mDataDefinedSizeLegendSettings;
+  return mDataDefinedSizeLegendSettings.get();
 }

src/core/symbology/qgslegendsymbolitem.h

@@ -53,7 +53,7 @@ class CORE_EXPORT QgsLegendSymbolItem
     QgsLegendSymbolItem &operator=( const QgsLegendSymbolItem &other );
 
     //! Returns associated symbol. May be null.
-    QgsSymbol *symbol() const { return mSymbol; }
+    QgsSymbol *symbol() const { return mSymbol.get(); }
     //! Returns text label
     QString label() const { return mLabel; }
     //! Returns unique identifier of the rule for identification of the item within renderer
@@ -107,8 +107,8 @@ class CORE_EXPORT QgsLegendSymbolItem
     QgsDataDefinedSizeLegend *dataDefinedSizeLegendSettings() const;
 
   private:
-    //! symbol. owned by the struct. can be null.
-    QgsSymbol *mSymbol = nullptr;
+    //! Legend symbol -- may be null.
+    std::unique_ptr< QgsSymbol > mSymbol;
     //! label of the item (may be empty or non-unique)
     QString mLabel;
     //! unique identifier of the symbol item (within renderer)
@@ -122,7 +122,7 @@ class CORE_EXPORT QgsLegendSymbolItem
      * optional pointer to data-defined legend size settings - if set, the output legend
      * node should be QgsDataDefinedSizeLegendNode rather than ordinary QgsSymbolLegendNode
      */
-    QgsDataDefinedSizeLegend *mDataDefinedSizeLegendSettings = nullptr;
+    std::unique_ptr< QgsDataDefinedSizeLegend > mDataDefinedSizeLegendSettings;
 
     // additional data that may be used for filtering