Misc optimisations identified by clazy:

- call reserve on container classes where applicable
- make sure Q_FOREACH uses references
- remove dynamic casts to base classes
- fix some implicit bool conversions

python/core/geometry/qgsgeometry.sip

@@ -532,7 +532,7 @@ class QgsGeometry
       public:
         Error();
         Error( QString m );
-        Error( QString m, QgsPoint p );
+        Error( QString m, const QgsPoint& p );
 
         QString what();
         QgsPoint where();

python/core/qgslegendsettings.sip

@@ -47,10 +47,10 @@ class QgsLegendSettings
     int columnCount() const;
     void setColumnCount( int c );
 
-    int splitLayer() const;
+    bool splitLayer() const;
     void setSplitLayer( bool s );
 
-    int equalColumnWidth() const;
+    bool equalColumnWidth() const;
     void setEqualColumnWidth( bool s );
 
     QColor fontColor() const;

python/core/qgsvectorlayer.sip

@@ -190,7 +190,7 @@ class QgsVectorLayer : QgsMapLayer
     struct RangeData
     {
       RangeData();
-      RangeData( QVariant theMin, QVariant theMax, QVariant theStep );
+      RangeData( const QVariant& theMin, const QVariant& theMax, const QVariant& theStep );
 
       QVariant mMin;
       QVariant mMax;

python/core/symbology-ng/qgsheatmaprenderer.sip

@@ -43,7 +43,8 @@ class QgsHeatmapRenderer : QgsFeatureRendererV2
      * @see setInvertRamp
      * @see colorRamp
     */
-    double invertRamp() const;
+    bool invertRamp() const;
+
     /** Sets whether the ramp is inverted
      * @param invert set to true to invert color ramp
      * @see invertRamp

python/core/symbology-ng/qgsrendererv2.sip

@@ -274,7 +274,7 @@ class QgsFeatureRendererV2
                                   bool drawVertexMarker );
 
     //! render editing vertex marker at specified point
-    void renderVertexMarker( QPointF& pt, QgsRenderContext& context );
+    void renderVertexMarker( const QPointF& pt, QgsRenderContext& context );
     //! render editing vertex marker for a polyline
     void renderVertexMarkerPolyline( QPolygonF& pts, QgsRenderContext& context );
     //! render editing vertex marker for a polygon

python/core/symbology-ng/qgssymbollayerv2utils.sip

@@ -169,7 +169,7 @@ class QgsSymbolLayerV2Utils
 
 
     static void labelTextToSld( QDomDocument &doc, QDomElement &element, QString label,
-                                QFont font, QColor color = QColor(), double size = -1 );
+                                const QFont& font, QColor color = QColor(), double size = -1 );
 
     /** Create ogr feature style string for pen */
     static QString ogrFeatureStylePen( double width, double mmScaleFactor, double mapUnitsScaleFactor, const QColor& c,

python/core/symbology-ng/qgssymbolv2.sip

@@ -156,7 +156,7 @@ class QgsSymbolV2
      * @note added in QGIS 2.9
      * @see setClipFeaturesToExtent
      */
-    double clipFeaturesToExtent() const;
+    bool clipFeaturesToExtent() const;
 
     QSet<QString> usedAttributes() const;
 

src/analysis/raster/qgsrelief.cpp

@@ -674,6 +674,7 @@ QList< QgsRelief::ReliefColor > QgsRelief::calculateOptimizedReliefClasses()
   colorList.push_back( QColor( 255, 133, 92 ) );
   colorList.push_back( QColor( 204, 204, 204 ) );
 
+  resultList.reserve( classBreaks.size() );
   for ( int i = 1; i < classBreaks.size(); ++i )
   {
     double minElevation = minMax[0] + classBreaks[i - 1] * frequencyClassRange;

src/analysis/vector/qgstransectsample.cpp

@@ -614,6 +614,7 @@ QgsGeometry* QgsTransectSample::clipBufferLine( const QgsGeometry* stratumGeom,
       }
 
       int size = bufferPolygon.size();
+      mpl.reserve( size );
       for ( int j = 0; j < size; ++j )
       {
         mpl.append( bufferPolygon[j] );

src/app/qgsattributetabledialog.cpp

@@ -329,7 +329,7 @@ void QgsAttributeTableDialog::columnBoxInit()
 
   QList<QgsField> fields = mLayer->fields().toList();
 
-  Q_FOREACH ( const QgsField field, fields )
+  Q_FOREACH ( const QgsField& field, fields )
   {
     int idx = mLayer->fieldNameIndex( field.name() );
     if ( idx < 0 )

src/app/qgsconfigureshortcutsdialog.cpp

@@ -75,6 +75,7 @@ void QgsConfigureShortcutsDialog::populateActions()
   QList<QAction*> actions = QgsShortcutsManager::instance()->listActions();
 
   QList<QTreeWidgetItem *> items;
+  items.reserve( actions.count() );
   for ( int i = 0; i < actions.count(); ++i )
   {
     QString actionText = actions[i]->text();

src/app/qgsdiagramproperties.cpp

@@ -683,6 +683,9 @@ void QgsDiagramProperties::apply()
   QList<QColor> categoryColors;
   QList<QString> categoryAttributes;
   QList<QString> categoryLabels;
+  categoryColors.reserve( mDiagramAttributesTreeWidget->topLevelItemCount() );
+  categoryAttributes.reserve( mDiagramAttributesTreeWidget->topLevelItemCount() );
+  categoryLabels.reserve( mDiagramAttributesTreeWidget->topLevelItemCount() );
   for ( int i = 0; i < mDiagramAttributesTreeWidget->topLevelItemCount(); ++i )
   {
     QColor color = mDiagramAttributesTreeWidget->topLevelItem( i )->background( 1 ).color();

src/app/qgslabeldialog.cpp

@@ -61,6 +61,7 @@ void QgsLabelDialog::init()
   const QgsFields& myFields = mLabel->fields();
   QStringList myFieldStringList;
   myFieldStringList.append( "" );
+  myFieldStringList.reserve( 1 + myFields.count() );
   for ( int i = 0; i < myFields.count(); ++i )
   {
     myFieldStringList.append( myFields[i].name() );

src/app/qgsmaptooladdfeature.cpp

@@ -223,7 +223,7 @@ void QgsMapToolAddFeature::cadCanvasReleaseEvent( QgsMapMouseEvent* e )
       QgsCurveV2* curveToAdd = 0;
       if ( hasCurvedSegments && providerSupportsCurvedSegments )
       {
-        curveToAdd = dynamic_cast<QgsCurveV2*>( captureCurve()->clone() );
+        curveToAdd = captureCurve()->clone();
       }
       else
       {

src/app/qgsmaptooladdpart.cpp

@@ -134,7 +134,7 @@ void QgsMapToolAddPart::cadCanvasReleaseEvent( QgsMapMouseEvent * e )
       QgsCurveV2* curveToAdd = 0;
       if ( hasCurvedSegments && providerSupportsCurvedSegments )
       {
-        curveToAdd = dynamic_cast<QgsCurveV2*>( captureCurve()->clone() );
+        curveToAdd = captureCurve()->clone();
       }
       else
       {

src/app/qgsmaptooladdring.cpp

@@ -92,7 +92,7 @@ void QgsMapToolAddRing::cadCanvasReleaseEvent( QgsMapMouseEvent * e )
     QgsCurveV2* curveToAdd = 0;
     if ( hasCurvedSegments && providerSupportsCurvedSegments )
     {
-      curveToAdd = dynamic_cast<QgsCurveV2*>( captureCurve()->clone() );
+      curveToAdd = captureCurve()->clone();
     }
     else
     {

src/app/qgsmergeattributesdialog.cpp

@@ -449,6 +449,7 @@ QVariant QgsMergeAttributesDialog::sumAttribute( int col )
 QVariant QgsMergeAttributesDialog::concatenationAttribute( int col )
 {
   QStringList concatString;
+  concatString.reserve( mFeatureList.size() );
   for ( int i = 0; i < mFeatureList.size(); ++i )
   {
     concatString << mTableWidget->item( i + 1, col )->text();

src/app/qgsoptions.cpp

@@ -1911,6 +1911,7 @@ void QgsOptions::on_pbnExportScales_clicked()
   }
 
   QStringList myScales;
+  myScales.reserve( mListGlobalScales->count() );
   for ( int i = 0; i < mListGlobalScales->count(); ++i )
   {
     myScales.append( mListGlobalScales->item( i )->text() );

src/app/qgsprojectproperties.cpp

@@ -686,6 +686,7 @@ void QgsProjectProperties::apply()
 
   //save project scales
   QStringList myScales;
+  myScales.reserve( lstScales->count() );
   for ( int i = 0; i < lstScales->count(); ++i )
   {
     myScales.append( lstScales->item( i )->text() );

src/core/auth/qgsauthcertutils.cpp

@@ -49,7 +49,7 @@ QString QgsAuthCertUtils::getSslProtocolName( QSsl::SslProtocol protocol )
 QMap<QString, QSslCertificate> QgsAuthCertUtils::mapDigestToCerts( QList<QSslCertificate> certs )
 {
   QMap<QString, QSslCertificate> digestmap;
-  Q_FOREACH ( QSslCertificate cert, certs )
+  Q_FOREACH ( const QSslCertificate& cert, certs )
   {
     digestmap.insert( shaHexForCert( cert ), cert );
   }
@@ -59,7 +59,7 @@ QMap<QString, QSslCertificate> QgsAuthCertUtils::mapDigestToCerts( QList<QSslCer
 QMap<QString, QList<QSslCertificate> > QgsAuthCertUtils::certsGroupedByOrg( QList<QSslCertificate> certs )
 {
   QMap< QString, QList<QSslCertificate> > orgcerts;
-  Q_FOREACH ( QSslCertificate cert, certs )
+  Q_FOREACH ( const QSslCertificate& cert, certs )
   {
     QString org( cert.subjectInfo( QSslCertificate::Organization ) );
     if ( org.isEmpty() )
@@ -73,7 +73,7 @@ QMap<QString, QList<QSslCertificate> > QgsAuthCertUtils::certsGroupedByOrg( QLis
 QMap<QString, QgsAuthConfigSslServer> QgsAuthCertUtils::mapDigestToSslConfigs( QList<QgsAuthConfigSslServer> configs )
 {
   QMap<QString, QgsAuthConfigSslServer> digestmap;
-  Q_FOREACH ( QgsAuthConfigSslServer config, configs )
+  Q_FOREACH ( const QgsAuthConfigSslServer& config, configs )
   {
     digestmap.insert( shaHexForCert( config.sslCertificate() ), config );
   }
@@ -83,7 +83,7 @@ QMap<QString, QgsAuthConfigSslServer> QgsAuthCertUtils::mapDigestToSslConfigs( Q
 QMap<QString, QList<QgsAuthConfigSslServer> > QgsAuthCertUtils::sslConfigsGroupedByOrg( QList<QgsAuthConfigSslServer> configs )
 {
   QMap< QString, QList<QgsAuthConfigSslServer> > orgconfigs;
-  Q_FOREACH ( QgsAuthConfigSslServer config, configs )
+  Q_FOREACH ( const QgsAuthConfigSslServer& config, configs )
   {
     QString org( config.sslCertificate().subjectInfo( QSslCertificate::Organization ) );
     if ( org.isEmpty() )
@@ -371,6 +371,7 @@ QString QgsAuthCertUtils::getColonDelimited( const QString &txt )
   // 64321c05b0ebab8e2b67ec0d7d9e2b6d4bc3c303
   //   -> 64:32:1c:05:b0:eb:ab:8e:2b:67:ec:0d:7d:9e:2b:6d:4b:c3:c3:03
   QStringList sl;
+  sl.reserve( txt.size() );
   for ( int i = 0; i < txt.size(); i += 2 )
   {
     sl << txt.mid( i, ( i + 2 > txt.size() ) ? -1 : 2 );
@@ -593,7 +594,7 @@ QList<QgsAuthCertUtils::CertUsageType> QgsAuthCertUtils::certificateUsageTypes(
   }
 
   QList<QCA::ConstraintType> certconsts = qcacert.constraints();
-  Q_FOREACH ( QCA::ConstraintType certconst, certconsts )
+  Q_FOREACH ( const QCA::ConstraintType& certconst, certconsts )
   {
     if ( certconst.known() == QCA::KeyCertificateSign )
     {

src/core/auth/qgsauthconfig.cpp

@@ -285,7 +285,7 @@ const QgsPkiBundle QgsPkiBundle::fromPkcs12Paths( const QString &bundlepath,
       if ( cert_chain.size() > 1 )
       {
         QList<QSslCertificate> ca_chain;
-        Q_FOREACH ( QCA::Certificate ca_cert, cert_chain )
+        Q_FOREACH ( const QCA::Certificate& ca_cert, cert_chain )
         {
           if ( ca_cert != cert_chain.primary() )
           {

src/core/auth/qgsauthmanager.cpp

@@ -2328,7 +2328,7 @@ const QList<QSslCertificate> QgsAuthManager::getExtraFileCAs()
     filecerts = QgsAuthCertUtils::certsFromFile( cafile );
   }
   // only CAs or certs capable of signing other certs are allowed
-  Q_FOREACH ( QSslCertificate cert, filecerts )
+  Q_FOREACH ( const QSslCertificate& cert, filecerts )
   {
     if ( !allowinvalid.toBool() && !cert.isValid() )
     {

src/core/composer/qgscomposerlegend.cpp

@@ -235,10 +235,10 @@ QString QgsComposerLegend::wrapChar() const {return mSettings.wrapChar(); }
 int QgsComposerLegend::columnCount() const { return mSettings.columnCount(); }
 void QgsComposerLegend::setColumnCount( int c ) { mSettings.setColumnCount( c ); }
 
-int QgsComposerLegend::splitLayer() const { return mSettings.splitLayer(); }
+bool QgsComposerLegend::splitLayer() const { return mSettings.splitLayer(); }
 void QgsComposerLegend::setSplitLayer( bool s ) { mSettings.setSplitLayer( s ); }
 
-int QgsComposerLegend::equalColumnWidth() const { return mSettings.equalColumnWidth(); }
+bool QgsComposerLegend::equalColumnWidth() const { return mSettings.equalColumnWidth(); }
 void QgsComposerLegend::setEqualColumnWidth( bool s ) { mSettings.setEqualColumnWidth( s ); }
 
 

src/core/composer/qgscomposerlegend.h

@@ -150,10 +150,10 @@ class CORE_EXPORT QgsComposerLegend : public QgsComposerItem
     int columnCount() const;
     void setColumnCount( int c );
 
-    int splitLayer() const;
+    bool splitLayer() const;
     void setSplitLayer( bool s );
 
-    int equalColumnWidth() const;
+    bool equalColumnWidth() const;
     void setEqualColumnWidth( bool s );
 
     void setComposerMap( const QgsComposerMap* map );

src/core/composer/qgscomposermap.cpp

@@ -1425,6 +1425,7 @@ bool QgsComposerMap::readXML( const QDomElement& itemElem, const QDomDocument& d
   {
     QDomElement layerSetElem = layerSetNodeList.at( 0 ).toElement();
     QDomNodeList layerIdNodeList = layerSetElem.elementsByTagName( "Layer" );
+    layerSet.reserve( layerIdNodeList.size() );
     for ( int i = 0; i < layerIdNodeList.size(); ++i )
     {
       const QDomElement& layerIdElement = layerIdNodeList.at( i ).toElement();