More Coverity memory leak fixes

python/core/qgsexpression.sip

@@ -195,6 +195,9 @@ class QgsExpression
     {
       public:
         Function( const QString& fnname, int params, const QString& group, const QString& helpText = QString(), bool usesGeometry = false, QStringList referencedColumns = QStringList(), bool lazyEval = false );
+        
+        virtual ~Function();
+        
         /** The name of the function. */
         QString name();
         /** The number of parameters this function takes. */

src/core/geometry/qgsgeometry.cpp

@@ -446,7 +446,7 @@ QgsPoint QgsGeometry::vertexAt( int atVertex ) const
   }
 
   QgsVertexId vId;
-  vertexIdFromVertexNr( atVertex, vId );
+  ( void )vertexIdFromVertexNr( atVertex, vId );
   if ( vId.vertex < 0 )
   {
     return QgsPoint( 0, 0 );
@@ -982,7 +982,7 @@ QgsMultiPoint QgsGeometry::asMultiPoint() const
   QgsMultiPoint multiPoint( nPoints );
   for ( int i = 0; i < nPoints; ++i )
   {
-    const QgsPointV2* pt = dynamic_cast<const QgsPointV2*>( mp->geometryN( i ) );
+    const QgsPointV2* pt = static_cast<const QgsPointV2*>( mp->geometryN( i ) );
     multiPoint[i].setX( pt->x() );
     multiPoint[i].setY( pt->y() );
   }

src/core/qgsexpression.h

@@ -288,6 +288,9 @@ class CORE_EXPORT QgsExpression
       public:
         Function( const QString& fnname, int params, QString group, QString helpText = QString(), bool usesGeometry = false, QStringList referencedColumns = QStringList(), bool lazyEval = false )
             : mName( fnname ), mParams( params ), mUsesGeometry( usesGeometry ), mGroup( group ), mHelpText( helpText ), mReferencedColumns( referencedColumns ), mLazyEval( lazyEval ) {}
+
+        virtual ~Function() {}
+
         /** The name of the function. */
         QString name() { return mName; }
         /** The number of parameters this function takes. */
@@ -340,6 +343,8 @@ class CORE_EXPORT QgsExpression
         StaticFunction( QString fnname, int params, FcnEval fcn, QString group, QString helpText = QString(), bool usesGeometry = false, QStringList referencedColumns = QStringList(), bool lazyEval = false, const QStringList& aliases = QStringList() )
             : Function( fnname, params, group, helpText, usesGeometry, referencedColumns, lazyEval ), mFnc( fcn ), mAliases( aliases ) {}
 
+        virtual ~StaticFunction() {}
+
         virtual QVariant func( const QVariantList& values, const QgsFeature* f, QgsExpression* parent ) override
         {
           return mFnc( values, f, parent );
@@ -537,10 +542,10 @@ class CORE_EXPORT QgsExpression
 
         virtual QStringList referencedColumns() const override { QStringList lst( mNode->referencedColumns() ); foreach ( Node* n, mList->list() ) lst.append( n->referencedColumns() ); return lst; }
         virtual bool needsGeometry() const override { bool needs = false; foreach ( Node* n, mList->list() ) needs |= n->needsGeometry(); return needs; }
-        virtual void accept( Visitor& v ) const override { v.visit( *this ); }
+          virtual void accept( Visitor& v ) const override { v.visit( *this ); }
 
-      protected:
+          protected:
-        Node* mNode;
+            Node* mNode;
         NodeList* mList;
         bool mNotIn;
     };

src/gui/symbology-ng/qgsgraduatedhistogramwidget.cpp

@@ -171,7 +171,7 @@ bool QgsGraduatedHistogramEventFilter::eventFilter( QObject *object, QEvent *eve
   {
     case QEvent::MouseButtonPress:
     {
-      const QMouseEvent* mouseEvent = dynamic_cast<QMouseEvent* >( event );
+      const QMouseEvent* mouseEvent = static_cast<QMouseEvent* >( event );
       if ( mouseEvent->button() == Qt::LeftButton )
       {
         emit mousePress( posToValue( mouseEvent->pos() ) );
@@ -180,7 +180,7 @@ bool QgsGraduatedHistogramEventFilter::eventFilter( QObject *object, QEvent *eve
     }
     case QEvent::MouseButtonRelease:
     {
-      const QMouseEvent* mouseEvent = dynamic_cast<QMouseEvent* >( event );
+      const QMouseEvent* mouseEvent = static_cast<QMouseEvent* >( event );
       if ( mouseEvent->button() == Qt::LeftButton )
       {
         emit mouseRelease( posToValue( mouseEvent->pos() ) );

src/gui/symbology-ng/qgssizescalewidget.cpp

@@ -40,7 +40,7 @@ class ItemDelegate : public QItemDelegate
     QSize sizeHint( const QStyleOptionViewItem& /*option*/, const QModelIndex & index ) const override
     {
       return mModel->item( index.row() )->icon().actualSize( QSize( 512, 512 ) );
-    }
+  }
 
   private:
     QStandardItemModel* mModel;
@@ -162,7 +162,7 @@ void QgsSizeScaleWidget::updatePreview()
   {
     QScopedPointer< QgsMarkerSymbolV2 > symbol( dynamic_cast<QgsMarkerSymbolV2*>( mSymbol->clone() ) );
     symbol->setDataDefinedSize( QgsDataDefined() );
-    symbol->setDataDefinedAngle( "" ); // to avoid symbol not beeing drawn
+    symbol->setDataDefinedAngle( QgsDataDefined() ); // to avoid symbol not beeing drawn
     symbol->setSize( expr->size( breaks[i] ) );
     QgsSymbolV2LegendNode node( mLayerTreeLayer, QgsLegendSymbolItemV2( symbol.data(), QString::number( i ), 0 ) );
     const QSize sz( node.minimumIconSize() );