loplugin:passstuffbyref also for {css::uno,rtl}::Reference

Change-Id: I2707d16e6dd7bc5617094963933fced147a496e8

38 files changed, 165 insertions, 165 deletions

diff --git a/sc/inc/nameuno.hxx b/sc/inc/nameuno.hxx
index 1e1fceb21a88..ecdedee8adfc 100644
--- a/sc/inc/nameuno.hxx
+++ b/sc/inc/nameuno.hxx
@@ -68,8 +68,8 @@ friend class ScVbaName;
     SCTAB                   GetTab_Impl();
 
 public:
-                            ScNamedRangeObj( rtl::Reference< ScNamedRangesObj > xParent, ScDocShell* pDocSh, const OUString& rNm,
-                                    css::uno::Reference< css::container::XNamed > xSheet = css::uno::Reference< css::container::XNamed > ());
+                            ScNamedRangeObj( rtl::Reference< ScNamedRangesObj > const & xParent, ScDocShell* pDocSh, const OUString& rNm,
+                                    css::uno::Reference< css::container::XNamed > const & xSheet = css::uno::Reference< css::container::XNamed > ());
     virtual                 ~ScNamedRangeObj();
 
     virtual void            Notify( SfxBroadcaster& rBC, const SfxHint& rHint ) override;
@@ -318,7 +318,7 @@ private:
 
     css::uno::Reference< css::container::XNamed > mxSheet;
 public:
-                            ScLocalNamedRangesObj(ScDocShell* pDocSh, css::uno::Reference< css::container::XNamed > xNamed );
+                            ScLocalNamedRangesObj(ScDocShell* pDocSh, css::uno::Reference< css::container::XNamed > const & xNamed );
     virtual                 ~ScLocalNamedRangesObj();
 };
 
diff --git a/sc/inc/xmlwrap.hxx b/sc/inc/xmlwrap.hxx
index d0e88122fb22..7179bd843870 100644
--- a/sc/inc/xmlwrap.hxx
+++ b/sc/inc/xmlwrap.hxx
@@ -91,7 +91,7 @@ public:
 class ScXMLChartExportWrapper
 {
 public:
-    ScXMLChartExportWrapper( css::uno::Reference< css::frame::XModel > xModel, SfxMedium& rMed );
+    ScXMLChartExportWrapper( css::uno::Reference< css::frame::XModel > const & xModel, SfxMedium& rMed );
     bool Export();
 
 private:
diff --git a/sc/qa/extras/new_cond_format.cxx b/sc/qa/extras/new_cond_format.cxx
index 0ac9888d539b..bd5bdeecc40e 100644
--- a/sc/qa/extras/new_cond_format.cxx
+++ b/sc/qa/extras/new_cond_format.cxx
@@ -101,7 +101,7 @@ void ScConditionalFormatTest::testRequestCondFormatListFromSheet()
 
 namespace {
 
-uno::Reference<sheet::XConditionalFormats> getConditionalFormatList(uno::Reference<uno::XInterface> xInterface)
+uno::Reference<sheet::XConditionalFormats> getConditionalFormatList(uno::Reference<uno::XInterface> const & xInterface)
 {
     uno::Reference<sheet::XSpreadsheet> xSheet(xInterface, uno::UNO_QUERY_THROW);
     uno::Reference<beans::XPropertySet> xProps(xSheet, uno::UNO_QUERY_THROW);
@@ -186,7 +186,7 @@ void ScConditionalFormatTest::testCondFormatXIndex()
 
 namespace {
 
-void testAxisPosition(uno::Reference<beans::XPropertySet> xPropSet, sal_Int32 ePos)
+void testAxisPosition(uno::Reference<beans::XPropertySet> const & xPropSet, sal_Int32 ePos)
 {
     sal_Int32 eAxisPos;
     uno::Any aAny = xPropSet->getPropertyValue("AxisPosition");
@@ -194,7 +194,7 @@ void testAxisPosition(uno::Reference<beans::XPropertySet> xPropSet, sal_Int32 eP
     CPPUNIT_ASSERT_EQUAL(ePos, eAxisPos);
 }
 
-void testShowValue(uno::Reference<beans::XPropertySet> xPropSet, bool bShowVal)
+void testShowValue(uno::Reference<beans::XPropertySet> const & xPropSet, bool bShowVal)
 {
     bool bShow;
     uno::Any aAny = xPropSet->getPropertyValue("ShowValue");
@@ -202,7 +202,7 @@ void testShowValue(uno::Reference<beans::XPropertySet> xPropSet, bool bShowVal)
     CPPUNIT_ASSERT_EQUAL(bShowVal, bShow);
 }
 
-void testUseGradient(uno::Reference<beans::XPropertySet> xPropSet, bool bUseGradient)
+void testUseGradient(uno::Reference<beans::XPropertySet> const & xPropSet, bool bUseGradient)
 {
     bool bGradient;
     uno::Any aAny = xPropSet->getPropertyValue("UseGradient");
@@ -210,7 +210,7 @@ void testUseGradient(uno::Reference<beans::XPropertySet> xPropSet, bool bUseGrad
     CPPUNIT_ASSERT_EQUAL(bUseGradient, bGradient);
 }
 
-void testPositiveColor(uno::Reference<beans::XPropertySet> xPropSet, Color aColor)
+void testPositiveColor(uno::Reference<beans::XPropertySet> const & xPropSet, Color aColor)
 {
     sal_Int32 nColor = 0;
     uno::Any aAny = xPropSet->getPropertyValue("Color");
@@ -218,7 +218,7 @@ void testPositiveColor(uno::Reference<beans::XPropertySet> xPropSet, Color aColo
     CPPUNIT_ASSERT_EQUAL(aColor.GetColor(), sal_uInt32(nColor));
 }
 
-void testNegativeColor(uno::Reference<beans::XPropertySet> xPropSet, Color aColor)
+void testNegativeColor(uno::Reference<beans::XPropertySet> const & xPropSet, Color aColor)
 {
     sal_Int32 nColor = 0;
     uno::Any aAny = xPropSet->getPropertyValue("NegativeColor");
@@ -226,7 +226,7 @@ void testNegativeColor(uno::Reference<beans::XPropertySet> xPropSet, Color aColo
     CPPUNIT_ASSERT_EQUAL(aColor.GetColor(), sal_uInt32(nColor));
 }
 
-void testAxisColor(uno::Reference<beans::XPropertySet> xPropSet, Color aColor)
+void testAxisColor(uno::Reference<beans::XPropertySet> const & xPropSet, Color aColor)
 {
     sal_Int32 nColor = 0;
     uno::Any aAny = xPropSet->getPropertyValue("AxisColor");
@@ -234,7 +234,7 @@ void testAxisColor(uno::Reference<beans::XPropertySet> xPropSet, Color aColor)
     CPPUNIT_ASSERT_EQUAL(aColor.GetColor(), sal_uInt32(nColor));
 }
 
-void testDataBarEntryValue(uno::Reference<sheet::XDataBarEntry> xEntry,
+void testDataBarEntryValue(uno::Reference<sheet::XDataBarEntry> const & xEntry,
         const OUString& rExpectedValue, sal_Int32 nType)
 {
     switch (nType)
@@ -253,7 +253,7 @@ void testDataBarEntryValue(uno::Reference<sheet::XDataBarEntry> xEntry,
     }
 }
 
-void testDataBarEntries(uno::Reference<beans::XPropertySet> xPropSet,
+void testDataBarEntries(uno::Reference<beans::XPropertySet> const & xPropSet,
         const OUString& rExpectedMinString, sal_Int32 nExpectedMinType,
         const OUString& rExpectedMaxString, sal_Int32 nExpectedMaxType)
 {
@@ -366,7 +366,7 @@ void ScConditionalFormatTest::testDataBarProperties()
 
 namespace {
 
-void testColorScaleEntry(uno::Reference<sheet::XColorScaleEntry> xEntry,
+void testColorScaleEntry(uno::Reference<sheet::XColorScaleEntry> const & xEntry,
         sal_Int32 nType, const OUString& rString, sal_uInt32 nColor)
 {
     CPPUNIT_ASSERT_EQUAL(nType, xEntry->getType());
@@ -386,7 +386,7 @@ void testColorScaleEntry(uno::Reference<sheet::XColorScaleEntry> xEntry,
     }
 }
 
-void testColorScaleEntries(uno::Reference<beans::XPropertySet> xPropSet, sal_Int32 nEntries,
+void testColorScaleEntries(uno::Reference<beans::XPropertySet> const & xPropSet, sal_Int32 nEntries,
         sal_Int32 nMinType, const OUString& rMinString, sal_uInt32 nMinColor,
         sal_Int32 nMediumType, const OUString& rMediumString, sal_uInt32 nMediumColor,
         sal_Int32 nMaxType, const OUString& rMaxString, sal_uInt32 nMaxColor)
diff --git a/sc/qa/unit/helper/xpath.cxx b/sc/qa/unit/helper/xpath.cxx
index 8056d4d4aac0..2117b749b326 100644
--- a/sc/qa/unit/helper/xpath.cxx
+++ b/sc/qa/unit/helper/xpath.cxx
@@ -18,14 +18,14 @@
 
 #include <com/sun/star/packages/zip/ZipFileAccess.hpp>
 
-xmlDocPtr XPathHelper::parseExport(ScDocShell& rShell, uno::Reference<lang::XMultiServiceFactory> xSFactory, const OUString& rFile, sal_Int32 nFormat)
+xmlDocPtr XPathHelper::parseExport(ScDocShell& rShell, uno::Reference<lang::XMultiServiceFactory> const & xSFactory, const OUString& rFile, sal_Int32 nFormat)
 {
     std::shared_ptr<utl::TempFile> pTempFile = ScBootstrapFixture::exportTo(&rShell, nFormat);
 
     return parseExport(pTempFile, xSFactory, rFile);
 }
 
-xmlDocPtr XPathHelper::parseExport(std::shared_ptr<utl::TempFile> pTempFile, uno::Reference<lang::XMultiServiceFactory> xSFactory, const OUString& rFile)
+xmlDocPtr XPathHelper::parseExport(std::shared_ptr<utl::TempFile> pTempFile, uno::Reference<lang::XMultiServiceFactory> const & xSFactory, const OUString& rFile)
 {
     // Read the XML stream we're interested in.
     uno::Reference<packages::zip::XZipFileAccess2> xNameAccess = packages::zip::ZipFileAccess::createWithURL(comphelper::getComponentContext(xSFactory), pTempFile->GetURL());
diff --git a/sc/qa/unit/helper/xpath.hxx b/sc/qa/unit/helper/xpath.hxx
index f53f9276f6a8..91a81e1253c3 100644
--- a/sc/qa/unit/helper/xpath.hxx
+++ b/sc/qa/unit/helper/xpath.hxx
@@ -44,7 +44,7 @@ namespace XPathHelper
      *      test several files in the same exported xml file you need to export the file manually
      *      and call the parseExport method that takes a TempFile
      */
-    SCQAHELPER_DLLPUBLIC xmlDocPtr parseExport(ScDocShell& rShell, uno::Reference< lang::XMultiServiceFactory> xSFactory,
+    SCQAHELPER_DLLPUBLIC xmlDocPtr parseExport(ScDocShell& rShell, uno::Reference< lang::XMultiServiceFactory> const & xSFactory,
             const OUString& rFile, sal_Int32 nFormat);
 
     /**
@@ -53,7 +53,7 @@ namespace XPathHelper
      * Should be used when the same exported file is used for testing different files in
      * the same zip file.
      */
-    SCQAHELPER_DLLPUBLIC xmlDocPtr parseExport(std::shared_ptr<utl::TempFile> pTempFile, uno::Reference< lang::XMultiServiceFactory> xSFactory,
+    SCQAHELPER_DLLPUBLIC xmlDocPtr parseExport(std::shared_ptr<utl::TempFile> pTempFile, uno::Reference< lang::XMultiServiceFactory> const & xSFactory,
             const OUString& rFile);
 }
 
diff --git a/sc/source/core/inc/addinlis.hxx b/sc/source/core/inc/addinlis.hxx
index ef9f7ba8f7da..0cd32e9c5102 100644
--- a/sc/source/core/inc/addinlis.hxx
+++ b/sc/source/core/inc/addinlis.hxx
@@ -42,7 +42,7 @@ private:
     static ::std::list<ScAddInListener*> aAllListeners;
 
     // always allocated via CreateListener
-    ScAddInListener( css::uno::Reference<css::sheet::XVolatileResult> xVR,
+    ScAddInListener( css::uno::Reference<css::sheet::XVolatileResult> const & xVR,
                     ScDocument* pD );
 
 public:
diff --git a/sc/source/core/tool/addinlis.cxx b/sc/source/core/tool/addinlis.cxx
index 75b0d5ac3699..845b5567e4aa 100644
--- a/sc/source/core/tool/addinlis.cxx
+++ b/sc/source/core/tool/addinlis.cxx
@@ -46,7 +46,7 @@ ScAddInListener* ScAddInListener::CreateListener(
     return pNew;
 }
 
-ScAddInListener::ScAddInListener( uno::Reference<sheet::XVolatileResult> xVR, ScDocument* pDoc ) :
+ScAddInListener::ScAddInListener( uno::Reference<sheet::XVolatileResult> const & xVR, ScDocument* pDoc ) :
     xVolRes( xVR )
 {
     pDocs = new ScAddInDocs();
diff --git a/sc/source/filter/chart/chart_imp.cxx b/sc/source/filter/chart/chart_imp.cxx
index 8a61be61e586..72d2c980d4b4 100644
--- a/sc/source/filter/chart/chart_imp.cxx
+++ b/sc/source/filter/chart/chart_imp.cxx
@@ -16,7 +16,7 @@
 
 using namespace com::sun::star;
 
-ScXMLChartExportWrapper::ScXMLChartExportWrapper( css::uno::Reference< css::frame::XModel > xModel, SfxMedium& rMed ):
+ScXMLChartExportWrapper::ScXMLChartExportWrapper( css::uno::Reference< css::frame::XModel > const & xModel, SfxMedium& rMed ):
     mxModel(xModel),
     mrMedium(rMed)
 {
diff --git a/sc/source/filter/excel/xechart.cxx b/sc/source/filter/excel/xechart.cxx
index 2b2c3a6e7214..d6eee66871c6 100644
--- a/sc/source/filter/excel/xechart.cxx
+++ b/sc/source/filter/excel/xechart.cxx
@@ -329,7 +329,7 @@ const XclChFormatInfo& XclExpChRoot::GetFormatInfo( XclChObjectType eObjType ) c
     return mxChData->mxFmtInfoProv->GetFormatInfo( eObjType );
 }
 
-void XclExpChRoot::InitConversion( css::uno::Reference< css::chart2::XChartDocument > xChartDoc, const Rectangle& rChartRect ) const
+void XclExpChRoot::InitConversion( css::uno::Reference< css::chart2::XChartDocument > const & xChartDoc, const Rectangle& rChartRect ) const
 {
     mxChData->InitConversion( GetRoot(), xChartDoc, rChartRect );
 }
@@ -886,7 +886,7 @@ XclExpChSourceLink::XclExpChSourceLink( const XclExpChRoot& rRoot, sal_uInt8 nDe
     maData.mnLinkType = EXC_CHSRCLINK_DIRECTLY;
 }
 
-sal_uInt16 XclExpChSourceLink::ConvertDataSequence( Reference< XDataSequence > xDataSeq, bool bSplitToColumns, sal_uInt16 nDefCount )
+sal_uInt16 XclExpChSourceLink::ConvertDataSequence( Reference< XDataSequence > const & xDataSeq, bool bSplitToColumns, sal_uInt16 nDefCount )
 {
     mxLinkFmla.reset();
     maData.mnLinkType = EXC_CHSRCLINK_DEFAULT;
@@ -1176,7 +1176,7 @@ void XclExpChText::SetRotation( sal_uInt16 nRotation )
     ::insert_value( maData.mnFlags, XclTools::GetXclOrientFromRot( nRotation ), 8, 3 );
 }
 
-void XclExpChText::ConvertTitle( Reference< XTitle > xTitle, sal_uInt16 nTarget, const OUString* pSubTitle )
+void XclExpChText::ConvertTitle( Reference< XTitle > const & xTitle, sal_uInt16 nTarget, const OUString* pSubTitle )
 {
     switch( nTarget )
     {
@@ -1412,7 +1412,7 @@ void XclExpChText::WriteBody( XclExpStream& rStrm )
 namespace {
 
 /** Creates and returns an Excel text object from the passed title. */
-XclExpChTextRef lclCreateTitle( const XclExpChRoot& rRoot, Reference< XTitled > xTitled, sal_uInt16 nTarget,
+XclExpChTextRef lclCreateTitle( const XclExpChRoot& rRoot, Reference< XTitled > const & xTitled, sal_uInt16 nTarget,
                                 const OUString* pSubTitle = nullptr )
 {
     Reference< XTitle > xTitle;
@@ -1645,7 +1645,7 @@ XclExpChSerTrendLine::XclExpChSerTrendLine( const XclExpChRoot& rRoot ) :
 {
 }
 
-bool XclExpChSerTrendLine::Convert( Reference< XRegressionCurve > xRegCurve, sal_uInt16 nSeriesIdx )
+bool XclExpChSerTrendLine::Convert( Reference< XRegressionCurve > const & xRegCurve, sal_uInt16 nSeriesIdx )
 {
     if( !xRegCurve.is() )
         return false;
@@ -1812,7 +1812,7 @@ void XclExpChSerErrorBar::WriteBody( XclExpStream& rStrm )
 namespace {
 
 /** Returns the property set of the specified data point. */
-ScfPropertySet lclGetPointPropSet( Reference< XDataSeries > xDataSeries, sal_Int32 nPointIdx )
+ScfPropertySet lclGetPointPropSet( Reference< XDataSeries > const & xDataSeries, sal_Int32 nPointIdx )
 {
     ScfPropertySet aPropSet;
     try
@@ -1843,7 +1843,7 @@ XclExpChSeries::XclExpChSeries( const XclExpChRoot& rRoot, sal_uInt16 nSeriesIdx
 }
 
 bool XclExpChSeries::ConvertDataSeries(
-        Reference< XDiagram > xDiagram, Reference< XDataSeries > xDataSeries,
+        Reference< XDiagram > const & xDiagram, Reference< XDataSeries > const & xDataSeries,
         const XclChExtTypeInfo& rTypeInfo, sal_uInt16 nGroupIdx, sal_uInt16 nFormatIdx )
 {
     bool bOk = false;
@@ -1963,7 +1963,7 @@ bool XclExpChSeries::ConvertDataSeries(
     return bOk;
 }
 
-bool XclExpChSeries::ConvertStockSeries( css::uno::Reference< css::chart2::XDataSeries > xDataSeries,
+bool XclExpChSeries::ConvertStockSeries( css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries,
         const OUString& rValueRole, sal_uInt16 nGroupIdx, sal_uInt16 nFormatIdx, bool bCloseSymbol )
 {
     bool bOk = false;
@@ -2005,7 +2005,7 @@ bool XclExpChSeries::ConvertStockSeries( css::uno::Reference< css::chart2::XData
     return bOk;
 }
 
-bool XclExpChSeries::ConvertTrendLine( const XclExpChSeries& rParent, Reference< XRegressionCurve > xRegCurve )
+bool XclExpChSeries::ConvertTrendLine( const XclExpChSeries& rParent, Reference< XRegressionCurve > const & xRegCurve )
 {
     InitFromParent( rParent );
 
@@ -2039,7 +2039,7 @@ bool XclExpChSeries::ConvertErrorBar( const XclExpChSeries& rParent, const ScfPr
     return bOk;
 }
 
-void XclExpChSeries::ConvertCategSequence( Reference< XLabeledDataSequence > xCategSeq )
+void XclExpChSeries::ConvertCategSequence( Reference< XLabeledDataSequence > const & xCategSeq )
 {
     if( xCategSeq.is() )
         maData.mnCategCount = mxCategLink->ConvertDataSequence( xCategSeq->getValues(), false );
@@ -2071,7 +2071,7 @@ void XclExpChSeries::InitFromParent( const XclExpChSeries& rParent )
     maData.mnValueCount = rParent.maData.mnValueCount;
 }
 
-void XclExpChSeries::CreateTrendLines( css::uno::Reference< css::chart2::XDataSeries > xDataSeries )
+void XclExpChSeries::CreateTrendLines( css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries )
 {
     Reference< XRegressionCurveContainer > xRegCurveCont( xDataSeries, UNO_QUERY );
     if( xRegCurveCont.is() )
@@ -2127,7 +2127,7 @@ XclExpChType::XclExpChType( const XclExpChRoot& rRoot ) :
 {
 }
 
-void XclExpChType::Convert( Reference< XDiagram > xDiagram, Reference< XChartType > xChartType,
+void XclExpChType::Convert( Reference< XDiagram > const & xDiagram, Reference< XChartType > const & xChartType,
         sal_Int32 nApiAxesSetIdx, bool bSwappedAxesSet, bool bHasXLabels )
 {
     if( xChartType.is() )
@@ -2406,7 +2406,7 @@ XclExpChTypeGroup::XclExpChTypeGroup( const XclExpChRoot& rRoot, sal_uInt16 nGro
 }
 
 void XclExpChTypeGroup::ConvertType(
-        Reference< XDiagram > xDiagram, Reference< XChartType > xChartType,
+        Reference< XDiagram > const & xDiagram, Reference< XChartType > const & xChartType,
         sal_Int32 nApiAxesSetIdx, bool b3dChart, bool bSwappedAxesSet, bool bHasXLabels )
 {
     // chart type settings
@@ -2431,7 +2431,7 @@ void XclExpChTypeGroup::ConvertType(
 }
 
 void XclExpChTypeGroup::ConvertSeries(
-        Reference< XDiagram > xDiagram, Reference< XChartType > xChartType,
+        Reference< XDiagram > const & xDiagram, Reference< XChartType > const & xChartType,
         sal_Int32 nGroupAxesSetIdx, bool bPercent, bool bConnectBars )
 {
     Reference< XDataSeriesContainer > xSeriesCont( xChartType, UNO_QUERY );
@@ -2501,7 +2501,7 @@ void XclExpChTypeGroup::ConvertSeries(
     }
 }
 
-void XclExpChTypeGroup::ConvertCategSequence( Reference< XLabeledDataSequence > xCategSeq )
+void XclExpChTypeGroup::ConvertCategSequence( Reference< XLabeledDataSequence > const & xCategSeq )
 {
     for( size_t nIdx = 0, nSize = maSeries.GetSize(); nIdx < nSize; ++nIdx )
         maSeries.GetRecord( nIdx )->ConvertCategSequence( xCategSeq );
@@ -2535,7 +2535,7 @@ sal_uInt16 XclExpChTypeGroup::GetFreeFormatIdx() const
 }
 
 void XclExpChTypeGroup::CreateDataSeries(
-        Reference< XDiagram > xDiagram, Reference< XDataSeries > xDataSeries )
+        Reference< XDiagram > const & xDiagram, Reference< XDataSeries > const & xDataSeries )
 {
     // let chart create series object with correct series index
     XclExpChSeriesRef xSeries = GetChartData().CreateSeries();
@@ -2549,7 +2549,7 @@ void XclExpChTypeGroup::CreateDataSeries(
 }
 
 void XclExpChTypeGroup::CreateAllStockSeries(
-        Reference< XChartType > xChartType, Reference< XDataSeries > xDataSeries )
+        Reference< XChartType > const & xChartType, Reference< XDataSeries > const & xDataSeries )
 {
     // create existing series objects
     bool bHasOpen = CreateStockSeries( xDataSeries, EXC_CHPROP_ROLE_OPENVALUES, false );
@@ -2586,7 +2586,7 @@ void XclExpChTypeGroup::CreateAllStockSeries(
     }
 }
 
-bool XclExpChTypeGroup::CreateStockSeries( Reference< XDataSeries > xDataSeries,
+bool XclExpChTypeGroup::CreateStockSeries( Reference< XDataSeries > const & xDataSeries,
         const OUString& rValueRole, bool bCloseSymbol )
 {
     bool bOk = false;
@@ -2889,7 +2889,7 @@ void XclExpChTick::WriteBody( XclExpStream& rStrm )
 namespace {
 
 /** Returns an API axis object from the passed coordinate system. */
-Reference< XAxis > lclGetApiAxis( Reference< XCoordinateSystem > xCoordSystem,
+Reference< XAxis > lclGetApiAxis( Reference< XCoordinateSystem > const & xCoordSystem,
         sal_Int32 nApiAxisDim, sal_Int32 nApiAxesSetIdx )
 {
     Reference< XAxis > xAxis;
@@ -2903,7 +2903,7 @@ Reference< XAxis > lclGetApiAxis( Reference< XCoordinateSystem > xCoordSystem,
     return xAxis;
 }
 
-Reference< cssc::XAxis > lclGetApiChart1Axis( Reference< XChartDocument > xChartDoc,
+Reference< cssc::XAxis > lclGetApiChart1Axis( Reference< XChartDocument > const & xChartDoc,
         sal_Int32 nApiAxisDim, sal_Int32 nApiAxesSetIdx )
 {
     Reference< cssc::XAxis > xChart1Axis;
@@ -2949,8 +2949,8 @@ void XclExpChAxis::SetRotation( sal_uInt16 nRotation )
         mxTick->SetRotation( nRotation );
 }
 
-void XclExpChAxis::Convert( Reference< XAxis > xAxis, Reference< XAxis > xCrossingAxis,
-        Reference< cssc::XAxis > xChart1Axis, const XclChExtTypeInfo& rTypeInfo )
+void XclExpChAxis::Convert( Reference< XAxis > const & xAxis, Reference< XAxis > const & xCrossingAxis,
+        Reference< cssc::XAxis > const & xChart1Axis, const XclChExtTypeInfo& rTypeInfo )
 {
     ScfPropertySet aAxisProp( xAxis );
     bool bCategoryAxis = ((GetAxisType() == EXC_CHAXIS_X) && rTypeInfo.mbCategoryAxis) || (GetAxisType() == EXC_CHAXIS_Z);
@@ -3023,7 +3023,7 @@ void XclExpChAxis::Convert( Reference< XAxis > xAxis, Reference< XAxis > xCrossi
     }
 }
 
-void XclExpChAxis::ConvertWall( css::uno::Reference< css::chart2::XDiagram > xDiagram )
+void XclExpChAxis::ConvertWall( css::uno::Reference< css::chart2::XDiagram > const & xDiagram )
 {
     if( xDiagram.is() ) switch( GetAxisType() )
     {
@@ -3080,7 +3080,7 @@ XclExpChAxesSet::XclExpChAxesSet( const XclExpChRoot& rRoot, sal_uInt16 nAxesSet
     maData.maRect.mnHeight = 2633;
 }
 
-sal_uInt16 XclExpChAxesSet::Convert( Reference< XDiagram > xDiagram, sal_uInt16 nFirstGroupIdx )
+sal_uInt16 XclExpChAxesSet::Convert( Reference< XDiagram > const & xDiagram, sal_uInt16 nFirstGroupIdx )
 {
     /*  First unused chart type group index is passed to be able to continue
         counting of chart type groups for secondary axes set. */
@@ -3266,7 +3266,7 @@ XclExpChTypeGroupRef XclExpChAxesSet::GetLastTypeGroup() const
 void XclExpChAxesSet::ConvertAxis(
         XclExpChAxisRef& rxChAxis, sal_uInt16 nAxisType,
         XclExpChTextRef& rxChAxisTitle, sal_uInt16 nTitleTarget,
-        Reference< XCoordinateSystem > xCoordSystem, const XclChExtTypeInfo& rTypeInfo,
+        Reference< XCoordinateSystem > const & xCoordSystem, const XclChExtTypeInfo& rTypeInfo,
         sal_Int32 nCrossingAxisDim )
 {
     // create and convert axis object
@@ -3308,7 +3308,7 @@ static void lcl_getChartSubTitle(const Reference<XChartDocument>& xChartDoc,
 }
 
 XclExpChChart::XclExpChChart( const XclExpRoot& rRoot,
-        Reference< XChartDocument > xChartDoc, const Rectangle& rChartRect ) :
+        Reference< XChartDocument > const & xChartDoc, const Rectangle& rChartRect ) :
     XclExpChGroupBase( XclExpChRoot( rRoot, *this ), EXC_CHFRBLOCK_TYPE_CHART, EXC_ID_CHCHART, 16 )
 {
     Size aPtSize = OutputDevice::LogicToLogic( rChartRect.GetSize(), MapMode( MAP_100TH_MM ), MapMode( MAP_POINT ) );
@@ -3468,7 +3468,7 @@ void XclExpChartDrawing::Save( XclExpStream& rStrm )
         mxObjRecs->Save( rStrm );
 }
 
-XclExpChart::XclExpChart( const XclExpRoot& rRoot, Reference< XModel > xModel, const Rectangle& rChartRect ) :
+XclExpChart::XclExpChart( const XclExpRoot& rRoot, Reference< XModel > const & xModel, const Rectangle& rChartRect ) :
     XclExpSubStream( EXC_BOF_CHART ),
     XclExpRoot( rRoot )
 {
diff --git a/sc/source/filter/excel/xeescher.cxx b/sc/source/filter/excel/xeescher.cxx
index 99ad68eea835..8c538b939463 100644
--- a/sc/source/filter/excel/xeescher.cxx
+++ b/sc/source/filter/excel/xeescher.cxx
@@ -459,7 +459,7 @@ XclExpControlHelper::~XclExpControlHelper()
 {
 }
 
-void XclExpControlHelper::ConvertSheetLinks( Reference< XShape > xShape )
+void XclExpControlHelper::ConvertSheetLinks( Reference< XShape > const & xShape )
 {
     mxCellLink.reset();
     mxSrcRange.reset();
@@ -531,7 +531,7 @@ void XclExpControlHelper::WriteFormulaSubRec( XclExpStream& rStrm, sal_uInt16 nS
 //delete for exporting OCX
 //#if EXC_EXP_OCX_CTRL
 
-XclExpOcxControlObj::XclExpOcxControlObj( XclExpObjectManager& rObjMgr, Reference< XShape > xShape,
+XclExpOcxControlObj::XclExpOcxControlObj( XclExpObjectManager& rObjMgr, Reference< XShape > const & xShape,
         const Rectangle* pChildAnchor, const OUString& rClassName, sal_uInt32 nStrmStart, sal_uInt32 nStrmSize ) :
     XclObj( rObjMgr, EXC_OBJTYPE_PICTURE, true ),
     XclExpControlHelper( rObjMgr.GetRoot() ),
@@ -636,7 +636,7 @@ void XclExpOcxControlObj::WriteSubRecs( XclExpStream& rStrm )
 
 //#else
 
-XclExpTbxControlObj::XclExpTbxControlObj( XclExpObjectManager& rRoot, Reference< XShape > xShape , const Rectangle* pChildAnchor ) :
+XclExpTbxControlObj::XclExpTbxControlObj( XclExpObjectManager& rRoot, Reference< XShape > const & xShape , const Rectangle* pChildAnchor ) :
     XclObj( rRoot, EXC_OBJTYPE_UNKNOWN, true ),
     XclMacroHelper( rRoot ),
     meEventType( EXC_TBX_EVENT_ACTION ),
@@ -1065,7 +1065,7 @@ void XclExpTbxControlObj::WriteSbs( XclExpStream& rStrm )
 
 //#endif
 
-XclExpChartObj::XclExpChartObj( XclExpObjectManager& rObjMgr, Reference< XShape > xShape, const Rectangle* pChildAnchor ) :
+XclExpChartObj::XclExpChartObj( XclExpObjectManager& rObjMgr, Reference< XShape > const & xShape, const Rectangle* pChildAnchor ) :
     XclObj( rObjMgr, EXC_OBJTYPE_CHART ),
     XclExpRoot( rObjMgr.GetRoot() ), mxShape( xShape )
 {
@@ -1371,7 +1371,7 @@ XclMacroHelper::SetMacroLink( const OUString& rMacroName )
     return false;
 }
 
-XclExpShapeObj::XclExpShapeObj( XclExpObjectManager& rRoot, css::uno::Reference< css::drawing::XShape > xShape, ScDocument* pDoc ) :
+XclExpShapeObj::XclExpShapeObj( XclExpObjectManager& rRoot, css::uno::Reference< css::drawing::XShape > const & xShape, ScDocument* pDoc ) :
     XclObjAny( rRoot, xShape, pDoc ),
     XclMacroHelper( rRoot )
 {
diff --git a/sc/source/filter/excel/xichart.cxx b/sc/source/filter/excel/xichart.cxx
index 09bd891da9c5..8b2f0150d96d 100644
--- a/sc/source/filter/excel/xichart.cxx
+++ b/sc/source/filter/excel/xichart.cxx
@@ -1973,7 +1973,7 @@ void XclImpChSeries::FinalizeDataFormats()
 namespace {
 
 /** Returns the property set of the specified data point. */
-ScfPropertySet lclGetPointPropSet( Reference< XDataSeries > xDataSeries, sal_uInt16 nPointIdx )
+ScfPropertySet lclGetPointPropSet( Reference< XDataSeries > const & xDataSeries, sal_uInt16 nPointIdx )
 {
     ScfPropertySet aPropSet;
     try
@@ -2143,7 +2143,7 @@ XclImpChDataFormatRef XclImpChSeries::CreateDataFormat( sal_uInt16 nPointIdx, sa
     return xDataFmt;
 }
 
-void XclImpChSeries::ConvertTrendLines( Reference< XDataSeries > xDataSeries ) const
+void XclImpChSeries::ConvertTrendLines( Reference< XDataSeries > const & xDataSeries ) const
 {
     Reference< XRegressionCurveContainer > xRegCurveCont( xDataSeries, UNO_QUERY );
     if( xRegCurveCont.is() )
@@ -2358,7 +2358,7 @@ Reference< XCoordinateSystem > XclImpChType::CreateCoordSystem( bool b3dChart )
     return xCoordSystem;
 }
 
-Reference< XChartType > XclImpChType::CreateChartType( Reference< XDiagram > xDiagram, bool b3dChart ) const
+Reference< XChartType > XclImpChType::CreateChartType( Reference< XDiagram > const & xDiagram, bool b3dChart ) const
 {
     OUString aService = OUString::createFromAscii( maTypeInfo.mpcServiceName );
     Reference< XChartType > xChartType( ScfApiHelper::CreateInstance( aService ), UNO_QUERY );
@@ -2763,7 +2763,7 @@ Reference< XCoordinateSystem > XclImpChTypeGroup::CreateCoordSystem() const
     return maType.CreateCoordSystem( Is3dChart() );
 }
 
-Reference< XChartType > XclImpChTypeGroup::CreateChartType( Reference< XDiagram > xDiagram, sal_Int32 nApiAxesSetIdx ) const
+Reference< XChartType > XclImpChTypeGroup::CreateChartType( Reference< XDiagram > const & xDiagram, sal_Int32 nApiAxesSetIdx ) const
 {
     OSL_ENSURE( IsValidGroup(), "XclImpChTypeGroup::CreateChartType - type group without series" );
 
@@ -2834,8 +2834,8 @@ void XclImpChTypeGroup::ReadChDataFormat( XclImpStream& rStrm )
         mxGroupFmt = xDataFmt;
 }
 
-void XclImpChTypeGroup::InsertDataSeries( Reference< XChartType > xChartType,
-        Reference< XDataSeries > xSeries, sal_Int32 nApiAxesSetIdx ) const
+void XclImpChTypeGroup::InsertDataSeries( Reference< XChartType > const & xChartType,
+        Reference< XDataSeries > const & xSeries, sal_Int32 nApiAxesSetIdx ) const
 {
     Reference< XDataSeriesContainer > xSeriesCont( xChartType, UNO_QUERY );
     if( xSeriesCont.is() && xSeries.is() )
@@ -2865,7 +2865,7 @@ void XclImpChTypeGroup::InsertDataSeries( Reference< XChartType > xChartType,
     }
 }
 
-void XclImpChTypeGroup::CreateDataSeries( Reference< XChartType > xChartType, sal_Int32 nApiAxesSetIdx ) const
+void XclImpChTypeGroup::CreateDataSeries( Reference< XChartType > const & xChartType, sal_Int32 nApiAxesSetIdx ) const
 {
     bool bSpline = false;
     for( XclImpChSeriesVec::const_iterator aIt = maSeries.begin(), aEnd = maSeries.end(); aIt != aEnd; ++aIt )
@@ -2882,7 +2882,7 @@ void XclImpChTypeGroup::CreateDataSeries( Reference< XChartType > xChartType, sa
     }
 }
 
-void XclImpChTypeGroup::CreateStockSeries( Reference< XChartType > xChartType, sal_Int32 nApiAxesSetIdx ) const
+void XclImpChTypeGroup::CreateStockSeries( Reference< XChartType > const & xChartType, sal_Int32 nApiAxesSetIdx ) const
 {
     // create the data series object
     Reference< XDataSeries > xDataSeries( ScfApiHelper::CreateInstance( SERVICE_CHART2_DATASERIES ), UNO_QUERY );
@@ -3583,7 +3583,7 @@ OUString XclImpChAxesSet::GetSingleSeriesTitle() const
     return (maTypeGroups.size() == 1) ? maTypeGroups.begin()->second->GetSingleSeriesTitle() : OUString();
 }
 
-void XclImpChAxesSet::Convert( Reference< XDiagram > xDiagram ) const
+void XclImpChAxesSet::Convert( Reference< XDiagram > const & xDiagram ) const
 {
     if( IsValidAxesSet() && xDiagram.is() )
     {
@@ -3675,7 +3675,7 @@ void XclImpChAxesSet::ReadChTypeGroup( XclImpStream& rStrm )
             itr, XclImpChTypeGroupMap::value_type(nGroupIdx, xTypeGroup));
 }
 
-Reference< XCoordinateSystem > XclImpChAxesSet::CreateCoordSystem( Reference< XDiagram > xDiagram ) const
+Reference< XCoordinateSystem > XclImpChAxesSet::CreateCoordSystem( Reference< XDiagram > const & xDiagram ) const
 {
     Reference< XCoordinateSystem > xCoordSystem;
 
@@ -3730,7 +3730,7 @@ Reference< XCoordinateSystem > XclImpChAxesSet::CreateCoordSystem( Reference< XD
 
 void XclImpChAxesSet::ConvertAxis(
         XclImpChAxisRef xChAxis, XclImpChTextRef xChAxisTitle,
-        Reference< XCoordinateSystem > xCoordSystem, const XclImpChAxis* pCrossingAxis ) const
+        Reference< XCoordinateSystem > const & xCoordSystem, const XclImpChAxis* pCrossingAxis ) const
 {
     if( xChAxis )
     {
@@ -3773,7 +3773,7 @@ Reference< XAxis > XclImpChAxesSet::CreateAxis( const XclImpChAxis& rChAxis, con
     return xAxis;
 }
 
-void XclImpChAxesSet::ConvertBackground( Reference< XDiagram > xDiagram ) const
+void XclImpChAxesSet::ConvertBackground( Reference< XDiagram > const & xDiagram ) const
 {
     XclImpChTypeGroupRef xTypeGroup = GetFirstTypeGroup();
     if( xTypeGroup && xTypeGroup->Is3dWallChart() )
@@ -4333,7 +4333,7 @@ sal_Size XclImpChart::GetProgressSize() const
         (mxChartDrawing ? mxChartDrawing->GetProgressSize() : 0);
 }
 
-void XclImpChart::Convert( Reference< XModel > xModel, XclImpDffConverter& rDffConv, const OUString& rObjName, const Rectangle& rChartRect ) const
+void XclImpChart::Convert( Reference< XModel > const & xModel, XclImpDffConverter& rDffConv, const OUString& rObjName, const Rectangle& rChartRect ) const
 {
     Reference< XChartDocument > xChartDoc( xModel, UNO_QUERY );
     if( xChartDoc.is() )
diff --git a/sc/source/filter/excel/xlchart.cxx b/sc/source/filter/excel/xlchart.cxx
index 1daed0f0d31d..d4ad17ed2d1e 100644
--- a/sc/source/filter/excel/xlchart.cxx
+++ b/sc/source/filter/excel/xlchart.cxx
@@ -547,7 +547,7 @@ const XclChTypeInfo& XclChTypeInfoProvider::GetTypeInfoFromService( const OUStri
 
 // Property helpers ===========================================================
 
-XclChObjectTable::XclChObjectTable( Reference< XMultiServiceFactory > xFactory,
+XclChObjectTable::XclChObjectTable( Reference< XMultiServiceFactory > const & xFactory,
         const OUString& rServiceName, const OUString& rObjNameBase ) :
     mxFactory( xFactory ),
     maServiceName( rServiceName ),
diff --git a/sc/source/filter/excel/xlescher.cxx b/sc/source/filter/excel/xlescher.cxx
index e13ff854c598..70a4d79dcb15 100644
--- a/sc/source/filter/excel/xlescher.cxx
+++ b/sc/source/filter/excel/xlescher.cxx
@@ -287,7 +287,7 @@ void XclObjTextData::ReadTxo8( XclImpStream& rStrm )
     mnFormatSize = rStrm.ReaduInt16();
 }
 
-Reference< XControlModel > XclControlHelper::GetControlModel( Reference< XShape > xShape )
+Reference< XControlModel > XclControlHelper::GetControlModel( Reference< XShape > const & xShape )
 {
     Reference< XControlModel > xCtrlModel;
     Reference< XControlShape > xCtrlShape( xShape, UNO_QUERY );
diff --git a/sc/source/filter/ftools/fapihelper.cxx b/sc/source/filter/ftools/fapihelper.cxx
index 8c57961dea42..3ad19a1fe4f3 100644
--- a/sc/source/filter/ftools/fapihelper.cxx
+++ b/sc/source/filter/ftools/fapihelper.cxx
@@ -135,7 +135,7 @@ ScfPropertySet::~ScfPropertySet()
         xPropSetOpt->enableChangeListenerNotification(true);
 }
 
-void ScfPropertySet::Set( Reference< XPropertySet > xPropSet )
+void ScfPropertySet::Set( Reference< XPropertySet > const & xPropSet )
 {
     mxPropSet = xPropSet;
     mxMultiPropSet.set( mxPropSet, UNO_QUERY );
diff --git a/sc/source/filter/inc/fapihelper.hxx b/sc/source/filter/inc/fapihelper.hxx
index fa5f404b48bc..362a42090371 100644
--- a/sc/source/filter/inc/fapihelper.hxx
+++ b/sc/source/filter/inc/fapihelper.hxx
@@ -122,7 +122,7 @@ public:
                         ~ScfPropertySet();
 
     /** Sets the passed UNO property set and releases the old UNO property set. */
-    void                Set( css::uno::Reference< css::beans::XPropertySet > xPropSet );
+    void                Set( css::uno::Reference< css::beans::XPropertySet > const & xPropSet );
     /** Queries the passed interface for an XPropertySet and releases the old UNO property set. */
     template< typename InterfaceType >
     inline void         Set( css::uno::Reference< InterfaceType > xInterface )
diff --git a/sc/source/filter/inc/xcl97esc.hxx b/sc/source/filter/inc/xcl97esc.hxx
index a3895c7c5efc..1aa85010123a 100644
--- a/sc/source/filter/inc/xcl97esc.hxx
+++ b/sc/source/filter/inc/xcl97esc.hxx
@@ -102,21 +102,21 @@ public:
     /** Creates an OCX form control OBJ record from the passed form control.
         @descr  Writes the form control data to the 'Ctls' stream. */
     std::unique_ptr<XclExpOcxControlObj> CreateOCXCtrlObj(
-                            css::uno::Reference< css::drawing::XShape > xShape,
+                            css::uno::Reference< css::drawing::XShape > const & xShape,
                             const Rectangle* pChildAnchor );
 
 private:
     tools::SvRef<SotStorageStream>  mxCtlsStrm;         /// The 'Ctls' stream.
     /** Creates a TBX form control OBJ record from the passed form control. */
     std::unique_ptr<XclExpTbxControlObj> CreateTBXCtrlObj(
-                            css::uno::Reference< css::drawing::XShape > xShape,
+                            css::uno::Reference< css::drawing::XShape > const & xShape,
                             const Rectangle* pChildAnchor );
 
 private:
     /** Tries to get the name of a Basic macro from a control. */
     void                ConvertTbxMacro(
                             XclExpTbxControlObj& rTbxCtrlObj,
-                            css::uno::Reference< css::awt::XControlModel > xCtrlModel );
+                            css::uno::Reference< css::awt::XControlModel > const & xCtrlModel );
 
     void                DeleteCurrAppData();
 
diff --git a/sc/source/filter/inc/xechart.hxx b/sc/source/filter/inc/xechart.hxx
index 37cdf1125d48..8baa58360796 100644
--- a/sc/source/filter/inc/xechart.hxx
+++ b/sc/source/filter/inc/xechart.hxx
@@ -99,7 +99,7 @@ public:
     const XclChFormatInfo& GetFormatInfo( XclChObjectType eObjType ) const;
 
     /** Starts the API chart document conversion. Must be called once before all API conversion. */
-    void                InitConversion( css::uno::Reference< css::chart2::XChartDocument > xChartDoc,
+    void                InitConversion( css::uno::Reference< css::chart2::XChartDocument > const & xChartDoc,
                                         const Rectangle& rChartRect ) const;
     /** Finishes the API chart document conversion. Must be called once after all API conversion. */
     void                FinishConversion() const;
@@ -389,7 +389,7 @@ public:
 
     void                ConvertString( const OUString& aString );
     /** Converts the passed source link, returns the number of linked values. */
-    sal_uInt16          ConvertDataSequence( css::uno::Reference< css::chart2::data::XDataSequence > xDataSeq,
+    sal_uInt16          ConvertDataSequence( css::uno::Reference< css::chart2::data::XDataSequence > const & xDataSeq,
                                              bool bSplitToColumns, sal_uInt16 nDefCount = 0 );
     /** Converts the passed sequence of formatted string objects, returns leading font index. */
     sal_uInt16          ConvertStringSequence( const css::uno::Sequence< css::uno::Reference< css::chart2::XFormattedString > >& rStringSeq );
@@ -497,7 +497,7 @@ public:
     virtual void        SetRotation( sal_uInt16 nRotation ) override;
 
     /** Converts all text settings of the passed title text object. */
-    void                ConvertTitle( css::uno::Reference< css::chart2::XTitle > xTitle, sal_uInt16 nTarget, const OUString* pSubTitle = nullptr );
+    void                ConvertTitle( css::uno::Reference< css::chart2::XTitle > const & xTitle, sal_uInt16 nTarget, const OUString* pSubTitle = nullptr );
     /** Converts all text settings of the passed legend. */
     void                ConvertLegend( const ScfPropertySet& rPropSet );
     /** Converts all settings of the passed data point caption text object. */
@@ -651,7 +651,7 @@ public:
     explicit            XclExpChSerTrendLine( const XclExpChRoot& rRoot );
 
     /** Converts the passed trend line, returns true if trend line type is supported. */
-    bool                Convert( css::uno::Reference< css::chart2::XRegressionCurve > xRegCurve,
+    bool                Convert( css::uno::Reference< css::chart2::XRegressionCurve > const & xRegCurve,
                                  sal_uInt16 nSeriesIdx );
 
     /** Returns formatting information of the trend line, created in Convert(). */
@@ -701,22 +701,22 @@ public:
 
     /** Converts the passed data series (source links and formatting). */
     bool                ConvertDataSeries(
-                            css::uno::Reference< css::chart2::XDiagram > xDiagram,
-                            css::uno::Reference< css::chart2::XDataSeries > xDataSeries,
+                            css::uno::Reference< css::chart2::XDiagram > const & xDiagram,
+                            css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries,
                             const XclChExtTypeInfo& rTypeInfo,
                             sal_uInt16 nGroupIdx, sal_uInt16 nFormatIdx );
     /** Converts the passed data series for stock charts. */
     bool                ConvertStockSeries(
-                            css::uno::Reference< css::chart2::XDataSeries > xDataSeries,
+                            css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries,
                             const OUString& rValueRole,
                             sal_uInt16 nGroupIdx, sal_uInt16 nFormatIdx, bool bCloseSymbol );
     /** Converts the passed error bar settings (called at trend line child series). */
     bool                ConvertTrendLine( const XclExpChSeries& rParent,
-                                          css::uno::Reference< css::chart2::XRegressionCurve > xRegCurve );
+                                          css::uno::Reference< css::chart2::XRegressionCurve > const & xRegCurve );
     /** Converts the passed error bar settings (called at error bar child series). */
     bool                ConvertErrorBar( const XclExpChSeries& rParent, const ScfPropertySet& rPropSet, sal_uInt8 nBarId );
     /** Converts and inserts category ranges for all inserted series. */
-    void                ConvertCategSequence( css::uno::Reference< css::chart2::data::XLabeledDataSequence > xCategSeq );
+    void                ConvertCategSequence( css::uno::Reference< css::chart2::data::XLabeledDataSequence > const & xCategSeq );
 
     /** Writes all embedded records. */
     virtual void        WriteSubRecords( XclExpStream& rStrm ) override;
@@ -725,7 +725,7 @@ private:
     /** Initializes members of this series to represent a child of the passed series. */
     void                InitFromParent( const XclExpChSeries& rParent );
     /** Tries to create trend line series objects (called at parent series). */
-    void                CreateTrendLines( css::uno::Reference< css::chart2::XDataSeries > xDataSeries );
+    void                CreateTrendLines( css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries );
     /** Tries to create positive and negative error bar series objects (called at parent series). */
     void                CreateErrorBars( const ScfPropertySet& rPropSet,
                             const OUString& rBarPropName,
@@ -765,8 +765,8 @@ public:
     explicit            XclExpChType( const XclExpChRoot& rRoot );
 
     /** Converts the passed chart type and the contained data series. */
-    void                Convert( css::uno::Reference< css::chart2::XDiagram > xDiagram,
-                                 css::uno::Reference< css::chart2::XChartType > xChartType,
+    void                Convert( css::uno::Reference< css::chart2::XDiagram > const & xDiagram,
+                                 css::uno::Reference< css::chart2::XChartType > const & xChartType,
                                  sal_Int32 nApiAxesSetIdx, bool bSwappedAxesSet, bool bHasXLabels );
     /** Sets stacking mode (standard or percent) for the series in this chart type group. */
     void                SetStacked( bool bPercent );
@@ -874,15 +874,15 @@ public:
     explicit            XclExpChTypeGroup( const XclExpChRoot& rRoot, sal_uInt16 nGroupIdx );
 
     /** Converts the passed chart type to Excel type settings. */
-    void                ConvertType( css::uno::Reference< css::chart2::XDiagram > xDiagram,
-                            css::uno::Reference< css::chart2::XChartType > xChartType,
+    void                ConvertType( css::uno::Reference< css::chart2::XDiagram > const & xDiagram,
+                            css::uno::Reference< css::chart2::XChartType > const & xChartType,
                             sal_Int32 nApiAxesSetIdx, bool b3dChart, bool bSwappedAxesSet, bool bHasXLabels );
     /** Converts and inserts all series from the passed chart type. */
-    void                ConvertSeries( css::uno::Reference< css::chart2::XDiagram > xDiagram,
-                            css::uno::Reference< css::chart2::XChartType > xChartType,
+    void                ConvertSeries( css::uno::Reference< css::chart2::XDiagram > const & xDiagram,
+                            css::uno::Reference< css::chart2::XChartType > const & xChartType,
                             sal_Int32 nGroupAxesSetIdx, bool bPercent, bool bConnectorLines );
     /** Converts and inserts category ranges for all inserted series. */
-    void                ConvertCategSequence( css::uno::Reference< css::chart2::data::XLabeledDataSequence > xCategSeq );
+    void                ConvertCategSequence( css::uno::Reference< css::chart2::data::XLabeledDataSequence > const & xCategSeq );
     /** Creates a legend object and converts all legend settings. */
     void                ConvertLegend( const ScfPropertySet& rPropSet );
 
@@ -908,13 +908,13 @@ private:
     /** Returns an unused format index to be used for the next created series. */
     sal_uInt16          GetFreeFormatIdx() const;
     /** Creates all data series of any chart type except stock charts. */
-    void                CreateDataSeries( css::uno::Reference< css::chart2::XDiagram > xDiagram,
-                            css::uno::Reference< css::chart2::XDataSeries > xDataSeries );
+    void                CreateDataSeries( css::uno::Reference< css::chart2::XDiagram > const & xDiagram,
+                            css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries );
     /** Creates all data series of a stock chart. */
-    void                CreateAllStockSeries( css::uno::Reference< css::chart2::XChartType > xChartType,
-                            css::uno::Reference< css::chart2::XDataSeries > xDataSeries );
+    void                CreateAllStockSeries( css::uno::Reference< css::chart2::XChartType > const & xChartType,
+                            css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries );
     /** Creates a single data series of a stock chart. */
-    bool                CreateStockSeries( css::uno::Reference< css::chart2::XDataSeries > xDataSeries,
+    bool                CreateStockSeries( css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries,
                             const OUString& rValueRole, bool bCloseSymbol );
 
     virtual void        WriteBody( XclExpStream& rStrm ) override;
@@ -1021,12 +1021,12 @@ public:
     virtual void        SetRotation( sal_uInt16 nRotation ) override;
 
     /** Converts formatting and scaling settings from the passed axis. */
-    void                Convert( css::uno::Reference< css::chart2::XAxis > xAxis,
-                            css::uno::Reference< css::chart2::XAxis > xCrossingAxis,
-                            css::uno::Reference< css::chart::XAxis > xChart1Axis,
+    void                Convert( css::uno::Reference< css::chart2::XAxis > const & xAxis,
+                            css::uno::Reference< css::chart2::XAxis > const & xCrossingAxis,
+                            css::uno::Reference< css::chart::XAxis > const & xChart1Axis,
                             const XclChExtTypeInfo& rTypeInfo );
     /** Converts and writes 3D wall/floor properties from the passed diagram. */
-    void                ConvertWall( css::uno::Reference< css::chart2::XDiagram > xDiagram );
+    void                ConvertWall( css::uno::Reference< css::chart2::XDiagram > const & xDiagram );
 
     /** Returns the type of this axis. */
     inline sal_uInt16   GetAxisType() const { return maData.mnType; }
@@ -1067,7 +1067,7 @@ public:
 
     /** Converts the passed diagram to chart record data.
         @return  First unused chart type group index. */
-    sal_uInt16          Convert( css::uno::Reference< css::chart2::XDiagram > xDiagram,
+    sal_uInt16          Convert( css::uno::Reference< css::chart2::XDiagram > const & xDiagram,
                                  sal_uInt16 nFirstGroupIdx );
 
     /** Returns true, if this axes set exists (returns false if this is a dummy object). */
@@ -1091,7 +1091,7 @@ private:
     /** Converts a complete axis object including axis title. */
     void                ConvertAxis( XclExpChAxisRef& rxChAxis, sal_uInt16 nAxisType,
                             XclExpChTextRef& rxChAxisTitle, sal_uInt16 nTitleTarget,
-                            css::uno::Reference< css::chart2::XCoordinateSystem > xCoordSystem,
+                            css::uno::Reference< css::chart2::XCoordinateSystem > const & xCoordSystem,
                             const XclChExtTypeInfo& rTypeInfo,
                             sal_Int32 nCrossingAxisDim );
 
@@ -1126,7 +1126,7 @@ class XclExpChChart : public XclExpChGroupBase
 {
 public:
     explicit            XclExpChChart( const XclExpRoot& rRoot,
-                            css::uno::Reference< css::chart2::XChartDocument > xChartDoc,
+                            css::uno::Reference< css::chart2::XChartDocument > const & xChartDoc,
                             const Rectangle& rChartRect );
 
     /** Creates, registers and returns a new data series object. */
@@ -1182,7 +1182,7 @@ class XclExpChart : public XclExpSubStream, protected XclExpRoot
 {
 public:
     explicit            XclExpChart( const XclExpRoot& rRoot,
-                            css::uno::Reference< css::frame::XModel > xModel,
+                            css::uno::Reference< css::frame::XModel > const & xModel,
                             const Rectangle& rChartRect );
 };
 
diff --git a/sc/source/filter/inc/xeescher.hxx b/sc/source/filter/inc/xeescher.hxx
index 2113e1e52ae2..bd94a98dbfb2 100644
--- a/sc/source/filter/inc/xeescher.hxx
+++ b/sc/source/filter/inc/xeescher.hxx
@@ -169,7 +169,7 @@ public:
 protected:
     /** Tries to get spreadsheet cell link and source range link from the passed shape. */
     void                ConvertSheetLinks(
-                            css::uno::Reference< css::drawing::XShape > xShape );
+                            css::uno::Reference< css::drawing::XShape > const & xShape );
 
     /** Returns the Excel token array of the cell link, or 0, if no link present. */
     inline const XclTokenArray* GetCellLinkTokArr() const { return mxCellLink.get(); }
@@ -211,7 +211,7 @@ public:
 class XclExpShapeObj : public XclObjAny, public XclMacroHelper
 {
 public:
-    explicit            XclExpShapeObj( XclExpObjectManager& rRoot, css::uno::Reference< css::drawing::XShape > xShape, ScDocument* pDoc );
+    explicit            XclExpShapeObj( XclExpObjectManager& rRoot, css::uno::Reference< css::drawing::XShape > const & xShape, ScDocument* pDoc );
     virtual             ~XclExpShapeObj();
 private:
     virtual void        WriteSubRecs( XclExpStream& rStrm ) override;
@@ -226,7 +226,7 @@ class XclExpOcxControlObj : public XclObj, public XclExpControlHelper
 public:
     explicit            XclExpOcxControlObj(
                             XclExpObjectManager& rObjMgr,
-                            css::uno::Reference< css::drawing::XShape > xShape,
+                            css::uno::Reference< css::drawing::XShape > const & xShape,
                             const Rectangle* pChildAnchor,
                             const OUString& rClassName,
                             sal_uInt32 nStrmStart, sal_uInt32 nStrmSize );
@@ -248,7 +248,7 @@ class XclExpTbxControlObj : public XclObj, public XclMacroHelper
 public:
     explicit            XclExpTbxControlObj(
                             XclExpObjectManager& rObjMgr,
-                            css::uno::Reference< css::drawing::XShape > xShape,
+                            css::uno::Reference< css::drawing::XShape > const & xShape,
                             const Rectangle* pChildAnchor );
 
     /** Sets the name of a macro attached to this control.
@@ -291,7 +291,7 @@ class XclExpChartObj : public XclObj, protected XclExpRoot
 public:
     explicit            XclExpChartObj(
                             XclExpObjectManager& rObjMgr,
-                            css::uno::Reference< css::drawing::XShape > xShape,
+                            css::uno::Reference< css::drawing::XShape > const & xShape,
                             const Rectangle* pChildAnchor );
     virtual             ~XclExpChartObj();
 
diff --git a/sc/source/filter/inc/xichart.hxx b/sc/source/filter/inc/xichart.hxx
index cd16646e6b41..9d3d9a0f194d 100644
--- a/sc/source/filter/inc/xichart.hxx
+++ b/sc/source/filter/inc/xichart.hxx
@@ -813,7 +813,7 @@ private:
     XclImpChDataFormatRef CreateDataFormat( sal_uInt16 nPointIdx, sal_uInt16 nFormatIdx );
 
     /** Converts all trend lines and inserts them into the passed API data series object. */
-    void                ConvertTrendLines( css::uno::Reference< css::chart2::XDataSeries > xDataSeries ) const;
+    void                ConvertTrendLines( css::uno::Reference< css::chart2::XDataSeries > const & xDataSeries ) const;
     /** Tries to create an error bar API object from the specified Excel error bars. */
     css::uno::Reference< css::beans::XPropertySet >
                         CreateErrorBar( sal_uInt8 nPosBarId, sal_uInt8 nNegBarId ) const;
@@ -869,7 +869,7 @@ public:
                         CreateCoordSystem( bool b3dChart ) const;
     /** Creates and returns an object that represents the contained chart type. */
     css::uno::Reference< css::chart2::XChartType >
-                        CreateChartType( css::uno::Reference< css::chart2::XDiagram > xDiagram, bool b3dChart ) const;
+                        CreateChartType( css::uno::Reference< css::chart2::XDiagram > const & xDiagram, bool b3dChart ) const;
 
 private:
     XclChType           maData;             /// Contents of the chart type record.
@@ -1008,7 +1008,7 @@ public:
                         CreateCoordSystem() const;
     /** Creates and returns an object that represents the contained chart type. */
     css::uno::Reference< css::chart2::XChartType >
-                        CreateChartType( css::uno::Reference< css::chart2::XDiagram > xDiagram, sal_Int32 nApiAxesSetIdx ) const;
+                        CreateChartType( css::uno::Reference< css::chart2::XDiagram > const & xDiagram, sal_Int32 nApiAxesSetIdx ) const;
     /** Creates a labeled data sequence object for axis categories. */
     css::uno::Reference< css::chart2::data::XLabeledDataSequence >
                         CreateCategSequence() const;
@@ -1027,14 +1027,14 @@ private:
     inline bool         HasDropBars() const { return !m_DropBars.empty(); }
 
     /** Inserts the passed series into the chart type. Adds additional properties to the series. */
-    void                InsertDataSeries( css::uno::Reference< css::chart2::XChartType > xChartType,
-                                          css::uno::Reference< css::chart2::XDataSeries > xSeries,
+    void                InsertDataSeries( css::uno::Reference< css::chart2::XChartType > const & xChartType,
+                                          css::uno::Reference< css::chart2::XDataSeries > const & xSeries,
                                           sal_Int32 nApiAxesSetIdx ) const;
     /** Creates all data series of any chart type except stock charts. */
-    void                CreateDataSeries( css::uno::Reference< css::chart2::XChartType > xChartType,
+    void                CreateDataSeries( css::uno::Reference< css::chart2::XChartType > const & xChartType,
                                           sal_Int32 nApiAxesSetIdx ) const;
     /** Creates all data series of a stock chart. */
-    void                CreateStockSeries( css::uno::Reference< css::chart2::XChartType > xChartType,
+    void                CreateStockSeries( css::uno::Reference< css::chart2::XChartType > const & xChartType,
                                            sal_Int32 nApiAxesSetIdx ) const;
 
 private:
@@ -1224,7 +1224,7 @@ public:
     OUString            GetSingleSeriesTitle() const;
 
     /** Creates a coordinate system and converts all series and axis settings. */
-    void                Convert( css::uno::Reference< css::chart2::XDiagram >  xDiagram ) const;
+    void                Convert( css::uno::Reference< css::chart2::XDiagram > const & xDiagram ) const;
     /** Converts the manual positions of all axis titles. */
     void                ConvertTitlePositions() const;
 
@@ -1240,16 +1240,16 @@ private:
 
     /** Creates a coordinate system that contains all chart types for this axes set. */
     css::uno::Reference< css::chart2::XCoordinateSystem >
-                        CreateCoordSystem( css::uno::Reference< css::chart2::XDiagram >  xDiagram ) const;
+                        CreateCoordSystem( css::uno::Reference< css::chart2::XDiagram > const & xDiagram ) const;
     /** Creates and inserts an axis into the container and registers the coordinate system. */
     void                ConvertAxis( XclImpChAxisRef xChAxis, XclImpChTextRef xChAxisTitle,
-                                     css::uno::Reference< css::chart2::XCoordinateSystem > xCoordSystem,
+                                     css::uno::Reference< css::chart2::XCoordinateSystem > const & xCoordSystem,
                                      const XclImpChAxis* pCrossingAxis ) const;
     /** Creates and returns an API axis object. */
     css::uno::Reference< css::chart2::XAxis >
                         CreateAxis( const XclImpChAxis& rChAxis, const XclImpChAxis* pCrossingAxis ) const;
     /** Writes all properties of the background area to the passed diagram. */
-    void                ConvertBackground( css::uno::Reference< css::chart2::XDiagram >  xDiagram ) const;
+    void                ConvertBackground( css::uno::Reference< css::chart2::XDiagram > const & xDiagram ) const;
 
 private:
     typedef ::std::map<sal_uInt16, XclImpChTypeGroupRef> XclImpChTypeGroupMap;
@@ -1396,7 +1396,7 @@ public:
     inline bool         IsPivotChart() const { return mbIsPivotChart; }
 
     /** Creates the chart object in the passed component. */
-    void                Convert( css::uno::Reference< css::frame::XModel > xModel,
+    void                Convert( css::uno::Reference< css::frame::XModel > const & xModel,
                             XclImpDffConverter& rDffConv,
                             const OUString& rObjName,
                             const Rectangle& rChartRect ) const;
diff --git a/sc/source/filter/inc/xlchart.hxx b/sc/source/filter/inc/xlchart.hxx
index 0007685e956a..152d876c76ac 100644
--- a/sc/source/filter/inc/xlchart.hxx
+++ b/sc/source/filter/inc/xlchart.hxx
@@ -1281,7 +1281,7 @@ typedef css::uno::Reference< css::drawing::XShape >
 class XclChObjectTable
 {
 public:
-    explicit            XclChObjectTable( css::uno::Reference< css::lang::XMultiServiceFactory > xFactory,
+    explicit            XclChObjectTable( css::uno::Reference< css::lang::XMultiServiceFactory > const & xFactory,
                             const OUString& rServiceName, const OUString& rObjNameBase );
 
     /** Returns a named formatting object from the chart document. */
diff --git a/sc/source/filter/inc/xlescher.hxx b/sc/source/filter/inc/xlescher.hxx
index dd007ce66e8a..3f8bde8a6c5d 100644
--- a/sc/source/filter/inc/xlescher.hxx
+++ b/sc/source/filter/inc/xlescher.hxx
@@ -421,7 +421,7 @@ class XclControlHelper
 public:
     /** Returns the API control model from the passed API shape object. */
     static css::uno::Reference< css::awt::XControlModel >
-                        GetControlModel( css::uno::Reference< css::drawing::XShape > xShape );
+                        GetControlModel( css::uno::Reference< css::drawing::XShape > const & xShape );
 
     /** Fills the macro descriptor according to the passed macro name. */
     static bool         FillMacroDescriptor(
diff --git a/sc/source/filter/xcl97/xcl97esc.cxx b/sc/source/filter/xcl97/xcl97esc.cxx
index bd845597a939..6b48b87df8b2 100644
--- a/sc/source/filter/xcl97/xcl97esc.cxx
+++ b/sc/source/filter/xcl97/xcl97esc.cxx
@@ -405,7 +405,7 @@ void XclEscherEx::EndDocument()
     mpOutStrm->Seek( 0 );
 }
 
-std::unique_ptr<XclExpOcxControlObj> XclEscherEx::CreateOCXCtrlObj( Reference< XShape > xShape, const Rectangle* pChildAnchor )
+std::unique_ptr<XclExpOcxControlObj> XclEscherEx::CreateOCXCtrlObj( Reference< XShape > const & xShape, const Rectangle* pChildAnchor )
 {
     ::std::unique_ptr< XclExpOcxControlObj > xOcxCtrl;
 
@@ -435,7 +435,7 @@ std::unique_ptr<XclExpOcxControlObj> XclEscherEx::CreateOCXCtrlObj( Reference< X
     return xOcxCtrl;
 }
 
-std::unique_ptr<XclExpTbxControlObj> XclEscherEx::CreateTBXCtrlObj( Reference< XShape > xShape, const Rectangle* pChildAnchor )
+std::unique_ptr<XclExpTbxControlObj> XclEscherEx::CreateTBXCtrlObj( Reference< XShape > const & xShape, const Rectangle* pChildAnchor )
 {
     ::std::unique_ptr< XclExpTbxControlObj > xTbxCtrl( new XclExpTbxControlObj( mrObjMgr, xShape, pChildAnchor ) );
     if( xTbxCtrl->GetObjType() == EXC_OBJTYPE_UNKNOWN )
@@ -450,7 +450,7 @@ std::unique_ptr<XclExpTbxControlObj> XclEscherEx::CreateTBXCtrlObj( Reference< X
     return xTbxCtrl;
 }
 
-void XclEscherEx::ConvertTbxMacro( XclExpTbxControlObj& rTbxCtrlObj, Reference< XControlModel > xCtrlModel )
+void XclEscherEx::ConvertTbxMacro( XclExpTbxControlObj& rTbxCtrlObj, Reference< XControlModel > const & xCtrlModel )
 {
     SdrPage* pSdrPage = GetSdrPage( GetCurrScTab() );
     if( xCtrlModel.is() && GetDocShell() && pSdrPage ) try
diff --git a/sc/source/filter/xml/xmlexprt.cxx b/sc/source/filter/xml/xmlexprt.cxx
index 38b168feb343..6cb41f5171fc 100644
--- a/sc/source/filter/xml/xmlexprt.cxx
+++ b/sc/source/filter/xml/xmlexprt.cxx
@@ -2178,7 +2178,7 @@ void ScXMLExport::AddStyleFromRow(const uno::Reference<beans::XPropertySet>& xRo
     }
 }
 
-static uno::Any lcl_GetEnumerated( uno::Reference<container::XEnumerationAccess> xEnumAccess, sal_Int32 nIndex )
+static uno::Any lcl_GetEnumerated( uno::Reference<container::XEnumerationAccess> const & xEnumAccess, sal_Int32 nIndex )
 {
     uno::Any aRet;
     uno::Reference<container::XEnumeration> xEnum( xEnumAccess->createEnumeration() );
@@ -2644,7 +2644,7 @@ void ScXMLExport::ExportMasterStyles_()
     GetPageExport()->exportMasterStyles( true );
 }
 
-void ScXMLExport::CollectInternalShape( uno::Reference< drawing::XShape > xShape )
+void ScXMLExport::CollectInternalShape( uno::Reference< drawing::XShape > const & xShape )
 {
     // detective objects and notes
     if( SvxShape* pShapeImp = SvxShape::getImplementation( xShape ) )
@@ -3040,7 +3040,7 @@ void writeContent(
 
 void flushParagraph(
     ScXMLExport& rExport, const OUString& rParaText,
-    rtl::Reference<XMLPropertySetMapper> xMapper, rtl::Reference<SvXMLAutoStylePoolP> xStylePool,
+    rtl::Reference<XMLPropertySetMapper> const & xMapper, rtl::Reference<SvXMLAutoStylePoolP> const & xStylePool,
     const ScXMLEditAttributeMap& rAttrMap,
     std::vector<editeng::Section>::const_iterator it, std::vector<editeng::Section>::const_iterator itEnd )
 {
diff --git a/sc/source/filter/xml/xmlexprt.hxx b/sc/source/filter/xml/xmlexprt.hxx
index 6d9b70376af1..114d322f1fb4 100644
--- a/sc/source/filter/xml/xmlexprt.hxx
+++ b/sc/source/filter/xml/xmlexprt.hxx
@@ -140,7 +140,7 @@ class ScXMLExport : public SvXMLExport
     virtual void ExportContent_() override;
     virtual void ExportMeta_() override;
 
-    void CollectInternalShape( css::uno::Reference< css::drawing::XShape > xShape );
+    void CollectInternalShape( css::uno::Reference< css::drawing::XShape > const & xShape );
 
     static css::table::CellRangeAddress GetEndAddress(const css::uno::Reference<css::sheet::XSpreadsheet>& xTable,
                                                         const sal_Int32 nTable);
diff --git a/sc/source/ui/inc/condformatuno.hxx b/sc/source/ui/inc/condformatuno.hxx
index c4cf9b703011..7bf0e7cd57ba 100644
--- a/sc/source/ui/inc/condformatuno.hxx
+++ b/sc/source/ui/inc/condformatuno.hxx
@@ -85,7 +85,7 @@ class ScCondFormatObj : public cppu::WeakImplHelper<css::sheet::XConditionalForm
                             css::beans::XPropertySet>
 {
 public:
-    ScCondFormatObj(ScDocShell* pDocShell, rtl::Reference<ScCondFormatsObj> xCondFormats, sal_Int32 nKey);
+    ScCondFormatObj(ScDocShell* pDocShell, rtl::Reference<ScCondFormatsObj> const & xCondFormats, sal_Int32 nKey);
 
     virtual ~ScCondFormatObj();
 
@@ -168,7 +168,7 @@ class ScConditionEntryObj : public cppu::WeakImplHelper<css::beans::XPropertySet
 {
 public:
 
-    ScConditionEntryObj(rtl::Reference<ScCondFormatObj> xParent,
+    ScConditionEntryObj(rtl::Reference<ScCondFormatObj> const & xParent,
             const ScCondFormatEntry* pFormat);
     virtual ~ScConditionEntryObj();
 
@@ -227,7 +227,7 @@ class ScColorScaleFormatObj : public cppu::WeakImplHelper<css::beans::XPropertyS
 {
 public:
 
-    ScColorScaleFormatObj(rtl::Reference<ScCondFormatObj> xParent, const ScColorScaleFormat* pFormat);
+    ScColorScaleFormatObj(rtl::Reference<ScCondFormatObj> const & xParent, const ScColorScaleFormat* pFormat);
     virtual ~ScColorScaleFormatObj();
 
     // XConditionEntry
@@ -283,7 +283,7 @@ private:
 class ScColorScaleEntryObj : public cppu::WeakImplHelper<css::sheet::XColorScaleEntry>
 {
 public:
-    ScColorScaleEntryObj(rtl::Reference<ScColorScaleFormatObj> xParent, size_t nPos);
+    ScColorScaleEntryObj(rtl::Reference<ScColorScaleFormatObj> const & xParent, size_t nPos);
 
     virtual ~ScColorScaleEntryObj();
 
@@ -316,7 +316,7 @@ class ScDataBarFormatObj : public cppu::WeakImplHelper<css::beans::XPropertySet,
                                 css::sheet::XConditionEntry>
 {
 public:
-    ScDataBarFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+    ScDataBarFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
             const ScDataBarFormat* pFormat);
     virtual ~ScDataBarFormatObj();
 
@@ -372,7 +372,7 @@ private:
 class ScDataBarEntryObj : public cppu::WeakImplHelper<css::sheet::XDataBarEntry>
 {
 public:
-    ScDataBarEntryObj(rtl::Reference<ScDataBarFormatObj> xParent, size_t nPos);
+    ScDataBarEntryObj(rtl::Reference<ScDataBarFormatObj> const & xParent, size_t nPos);
 
     virtual ~ScDataBarEntryObj();
 
@@ -399,7 +399,7 @@ class ScIconSetFormatObj : public cppu::WeakImplHelper<css::beans::XPropertySet,
                                 css::sheet::XConditionEntry>
 {
 public:
-    ScIconSetFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+    ScIconSetFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
             const ScIconSetFormat* pFormat);
     virtual ~ScIconSetFormatObj();
 
@@ -455,7 +455,7 @@ private:
 class ScIconSetEntryObj : public cppu::WeakImplHelper<css::sheet::XIconSetEntry>
 {
 public:
-    ScIconSetEntryObj(rtl::Reference<ScIconSetFormatObj> xParent, size_t nPos);
+    ScIconSetEntryObj(rtl::Reference<ScIconSetFormatObj> const & xParent, size_t nPos);
 
     virtual ~ScIconSetEntryObj();
 
@@ -482,7 +482,7 @@ class ScCondDateFormatObj : public cppu::WeakImplHelper<css::beans::XPropertySet
                                 css::sheet::XConditionEntry>
 {
 public:
-    ScCondDateFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+    ScCondDateFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
             const ScCondDateFormatEntry* pFormat);
 
     virtual ~ScCondDateFormatObj();
diff --git a/sc/source/ui/inc/spelleng.hxx b/sc/source/ui/inc/spelleng.hxx
index edc9225738cf..c5211ab46d42 100644
--- a/sc/source/ui/inc/spelleng.hxx
+++ b/sc/source/ui/inc/spelleng.hxx
@@ -99,7 +99,7 @@ public:
                             ScViewData& rViewData,
                             ScDocument* pUndoDoc,
                             ScDocument* pRedoDoc,
-                            css::uno::Reference< css::linguistic2::XSpellChecker1 > xSpeller );
+                            css::uno::Reference< css::linguistic2::XSpellChecker1 > const & xSpeller );
 
     /** Checks spelling of all cells in the selection or sheet. */
     virtual void        ConvertAll( EditView& rEditView ) override;
diff --git a/sc/source/ui/unoobj/condformatuno.cxx b/sc/source/ui/unoobj/condformatuno.cxx
index b598649c2278..bf402f013301 100644
--- a/sc/source/ui/unoobj/condformatuno.cxx
+++ b/sc/source/ui/unoobj/condformatuno.cxx
@@ -409,7 +409,7 @@ ScConditionalFormatList* ScCondFormatsObj::getCoreObject()
 namespace {
 
 uno::Reference<beans::XPropertySet> createConditionEntry(const ScFormatEntry* pEntry,
-        rtl::Reference<ScCondFormatObj> xParent)
+        rtl::Reference<ScCondFormatObj> const & xParent)
 {
     switch (pEntry->GetType())
     {
@@ -441,7 +441,7 @@ uno::Reference<beans::XPropertySet> createConditionEntry(const ScFormatEntry* pE
 
 }
 
-ScCondFormatObj::ScCondFormatObj(ScDocShell* pDocShell, rtl::Reference<ScCondFormatsObj> xCondFormats,
+ScCondFormatObj::ScCondFormatObj(ScDocShell* pDocShell, rtl::Reference<ScCondFormatsObj> const & xCondFormats,
         sal_Int32 nKey):
     mxCondFormatList(xCondFormats),
     mpDocShell(pDocShell),
@@ -682,7 +682,7 @@ bool isObjectStillAlive(ScConditionalFormat* pFormat, const ScFormatEntry* pEntr
 
 }
 
-ScConditionEntryObj::ScConditionEntryObj(rtl::Reference<ScCondFormatObj> xParent,
+ScConditionEntryObj::ScConditionEntryObj(rtl::Reference<ScCondFormatObj> const & xParent,
         const ScCondFormatEntry* pFormat):
     mpDocShell(xParent->getDocShell()),
     mxParent(xParent),
@@ -865,7 +865,7 @@ void SAL_CALL ScConditionEntryObj::removeVetoableChangeListener( const OUString&
     SAL_WARN("sc", "not implemented");
 }
 
-ScColorScaleFormatObj::ScColorScaleFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+ScColorScaleFormatObj::ScColorScaleFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
         const ScColorScaleFormat* pFormat):
     mxParent(xParent),
     maPropSet(getColorScalePropSet()),
@@ -902,7 +902,7 @@ uno::Reference<beans::XPropertySetInfo> SAL_CALL ScColorScaleFormatObj::getPrope
 
 namespace {
 
-void setColorScaleEntry(ScColorScaleEntry* pEntry, uno::Reference<sheet::XColorScaleEntry> xEntry)
+void setColorScaleEntry(ScColorScaleEntry* pEntry, uno::Reference<sheet::XColorScaleEntry> const & xEntry)
 {
     ScColorScaleEntryType eType = ScColorScaleEntryType();
     sal_Int32 nApiType = xEntry->getType();
@@ -1041,7 +1041,7 @@ void SAL_CALL ScColorScaleFormatObj::removeVetoableChangeListener( const OUStrin
     SAL_WARN("sc", "not implemented");
 }
 
-ScColorScaleEntryObj::ScColorScaleEntryObj(rtl::Reference<ScColorScaleFormatObj> xParent,
+ScColorScaleEntryObj::ScColorScaleEntryObj(rtl::Reference<ScColorScaleFormatObj> const & xParent,
         size_t nPos):
     mxParent(xParent),
     mnPos(nPos)
@@ -1137,7 +1137,7 @@ void ScColorScaleEntryObj::setFormula(const OUString& rFormula)
 }
 
 
-ScDataBarFormatObj::ScDataBarFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+ScDataBarFormatObj::ScDataBarFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
         const ScDataBarFormat* pFormat):
     mxParent(xParent),
     maPropSet(getDataBarPropSet()),
@@ -1175,7 +1175,7 @@ uno::Reference<beans::XPropertySetInfo> SAL_CALL ScDataBarFormatObj::getProperty
 
 namespace {
 
-void setDataBarEntry(ScColorScaleEntry* pEntry, uno::Reference<sheet::XDataBarEntry> xEntry)
+void setDataBarEntry(ScColorScaleEntry* pEntry, uno::Reference<sheet::XDataBarEntry> const & xEntry)
 {
     ScColorScaleEntryType eType = ScColorScaleEntryType();
     sal_Int32 nApiType = xEntry->getType();
@@ -1451,7 +1451,7 @@ void SAL_CALL ScDataBarFormatObj::removeVetoableChangeListener( const OUString&,
     SAL_WARN("sc", "not implemented");
 }
 
-ScDataBarEntryObj::ScDataBarEntryObj(rtl::Reference<ScDataBarFormatObj> xParent,
+ScDataBarEntryObj::ScDataBarEntryObj(rtl::Reference<ScDataBarFormatObj> const & xParent,
         size_t nPos):
     mxParent(xParent),
     mnPos(nPos)
@@ -1537,7 +1537,7 @@ void ScDataBarEntryObj::setFormula(const OUString& rFormula)
 }
 
 
-ScIconSetFormatObj::ScIconSetFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+ScIconSetFormatObj::ScIconSetFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
         const ScIconSetFormat* pFormat):
     mxParent(xParent),
     maPropSet(getIconSetPropSet()),
@@ -1575,7 +1575,7 @@ uno::Reference<beans::XPropertySetInfo> SAL_CALL ScIconSetFormatObj::getProperty
 
 namespace {
 
-void setIconSetEntry(ScIconSetFormat* pFormat, uno::Reference<sheet::XIconSetEntry> xEntry, size_t nPos)
+void setIconSetEntry(ScIconSetFormat* pFormat, uno::Reference<sheet::XIconSetEntry> const & xEntry, size_t nPos)
 {
     ScIconSetFormatData* pData = pFormat->GetIconSetData();
     ScColorScaleEntryType eType = ScColorScaleEntryType();
@@ -1770,7 +1770,7 @@ void SAL_CALL ScIconSetFormatObj::removeVetoableChangeListener( const OUString&,
     SAL_WARN("sc", "not implemented");
 }
 
-ScIconSetEntryObj::ScIconSetEntryObj(rtl::Reference<ScIconSetFormatObj> xParent,
+ScIconSetEntryObj::ScIconSetEntryObj(rtl::Reference<ScIconSetFormatObj> const & xParent,
         size_t nPos):
     mxParent(xParent),
     mnPos(nPos)
@@ -1860,7 +1860,7 @@ void ScIconSetEntryObj::setFormula(const OUString& rFormula)
     }
 }
 
-ScCondDateFormatObj::ScCondDateFormatObj(rtl::Reference<ScCondFormatObj> xParent,
+ScCondDateFormatObj::ScCondDateFormatObj(rtl::Reference<ScCondFormatObj> const & xParent,
         const ScCondDateFormatEntry* pFormat):
     mxParent(xParent),
     maPropSet(getCondDatePropSet()),
diff --git a/sc/source/ui/unoobj/nameuno.cxx b/sc/source/ui/unoobj/nameuno.cxx
index 5c60a5b2d496..df1c88d67842 100644
--- a/sc/source/ui/unoobj/nameuno.cxx
+++ b/sc/source/ui/unoobj/nameuno.cxx
@@ -81,7 +81,7 @@ static bool lcl_UserVisibleName(const ScRangeData& rData)
     return !rData.HasType(ScRangeData::Type::Database);
 }
 
-ScNamedRangeObj::ScNamedRangeObj( rtl::Reference< ScNamedRangesObj > xParent, ScDocShell* pDocSh, const OUString& rNm, Reference<container::XNamed> xSheet):
+ScNamedRangeObj::ScNamedRangeObj( rtl::Reference< ScNamedRangesObj > const & xParent, ScDocShell* pDocSh, const OUString& rNm, Reference<container::XNamed> const & xSheet):
     mxParent(xParent),
     pDocShell( pDocSh ),
     aName( rNm ),
@@ -867,7 +867,7 @@ SCTAB ScGlobalNamedRangesObj::GetTab_Impl()
     return -1;
 }
 
-ScLocalNamedRangesObj::ScLocalNamedRangesObj( ScDocShell* pDocSh, uno::Reference<container::XNamed> xSheet )
+ScLocalNamedRangesObj::ScLocalNamedRangesObj( ScDocShell* pDocSh, uno::Reference<container::XNamed> const & xSheet )
     : ScNamedRangesObj(pDocSh),
     mxSheet(xSheet)
 {
diff --git a/sc/source/ui/vba/vbadialog.hxx b/sc/source/ui/vba/vbadialog.hxx
index 8d63ee7f5756..376d9198673e 100644
--- a/sc/source/ui/vba/vbadialog.hxx
+++ b/sc/source/ui/vba/vbadialog.hxx
@@ -29,7 +29,7 @@ typedef cppu::ImplInheritanceHelper< VbaDialogBase, ov::excel::XDialog > ScVbaDi
 class ScVbaDialog : public ScVbaDialog_BASE
 {
 public:
-    ScVbaDialog( const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext > xContext, const css::uno::Reference< css::frame::XModel >& xModel, sal_Int32 nIndex ):ScVbaDialog_BASE( xParent, xContext, xModel, nIndex ) {}
+    ScVbaDialog( const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext > & xContext, const css::uno::Reference< css::frame::XModel >& xModel, sal_Int32 nIndex ):ScVbaDialog_BASE( xParent, xContext, xModel, nIndex ) {}
     virtual ~ScVbaDialog() {}
 
     // Methods
diff --git a/sc/source/ui/vba/vbaoleobject.cxx b/sc/source/ui/vba/vbaoleobject.cxx
index 45a2ddd72846..f08eab946af9 100644
--- a/sc/source/ui/vba/vbaoleobject.cxx
+++ b/sc/source/ui/vba/vbaoleobject.cxx
@@ -33,7 +33,7 @@ using namespace com::sun::star;
 using namespace ooo::vba;
 
 ScVbaOLEObject::ScVbaOLEObject( const uno::Reference< XHelperInterface >& xParent, const uno::Reference< uno::XComponentContext >& xContext,
-            css::uno::Reference< css::drawing::XControlShape > xControlShape )
+            css::uno::Reference< css::drawing::XControlShape > const & xControlShape )
 : OLEObjectImpl_BASE( xParent, xContext )
 {
     //init m_xWindowPeer
diff --git a/sc/source/ui/vba/vbaoleobject.hxx b/sc/source/ui/vba/vbaoleobject.hxx
index 3f4c37c7552e..e9285496035e 100644
--- a/sc/source/ui/vba/vbaoleobject.hxx
+++ b/sc/source/ui/vba/vbaoleobject.hxx
@@ -35,7 +35,7 @@ protected:
     css::uno::Reference< ov::msforms::XControl> m_xControl;
 public:
     ScVbaOLEObject( const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext >& xContext,
-            css::uno::Reference< css::drawing::XControlShape > xControlShape );
+            css::uno::Reference< css::drawing::XControlShape > const & xControlShape );
 
     // XOLEObject Attributes
     virtual css::uno::Reference< css::uno::XInterface > SAL_CALL getObject() throw (css::uno::RuntimeException, std::exception) override;
diff --git a/sc/source/ui/vba/vbaoutline.hxx b/sc/source/ui/vba/vbaoutline.hxx
index 6bd791d827c3..c2771d6aa9f4 100644
--- a/sc/source/ui/vba/vbaoutline.hxx
+++ b/sc/source/ui/vba/vbaoutline.hxx
@@ -31,7 +31,7 @@ class ScVbaOutline :  public ScVbaOutline_BASE
     css::uno::Reference< css::sheet::XSheetOutline > mxOutline;
 public:
     ScVbaOutline( const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext >& xContext,
-         css::uno::Reference<css::sheet::XSheetOutline> outline): ScVbaOutline_BASE( xParent, xContext) , mxOutline(outline)
+         css::uno::Reference<css::sheet::XSheetOutline> const & outline): ScVbaOutline_BASE( xParent, xContext) , mxOutline(outline)
     {}
     virtual ~ScVbaOutline(){}
 
diff --git a/sc/source/ui/vba/vbaworkbook.cxx b/sc/source/ui/vba/vbaworkbook.cxx
index 6b97d3b7bb90..4547cc234a72 100644
--- a/sc/source/ui/vba/vbaworkbook.cxx
+++ b/sc/source/ui/vba/vbaworkbook.cxx
@@ -203,7 +203,7 @@ ScVbaWorkbook::init()
         ResetColors();
 }
 
-ScVbaWorkbook::ScVbaWorkbook(   const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext >& xContext, css::uno::Reference< css::frame::XModel > xModel ) : ScVbaWorkbook_BASE( xParent, xContext, xModel )
+ScVbaWorkbook::ScVbaWorkbook(   const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext >& xContext, css::uno::Reference< css::frame::XModel > const & xModel ) : ScVbaWorkbook_BASE( xParent, xContext, xModel )
 {
     init();
 }
diff --git a/sc/source/ui/vba/vbaworkbook.hxx b/sc/source/ui/vba/vbaworkbook.hxx
index 49d434ced9f8..80b89523cebc 100644
--- a/sc/source/ui/vba/vbaworkbook.hxx
+++ b/sc/source/ui/vba/vbaworkbook.hxx
@@ -36,7 +36,7 @@ class ScVbaWorkbook : public ScVbaWorkbook_BASE
 
 public:
     ScVbaWorkbook(  const css::uno::Reference< ov::XHelperInterface >& xParent, const css::uno::Reference< css::uno::XComponentContext >& xContext,
-            css::uno::Reference< css::frame::XModel > xModel );
+            css::uno::Reference< css::frame::XModel > const & xModel );
     ScVbaWorkbook(  css::uno::Sequence< css::uno::Any > const& aArgs, css::uno::Reference< css::uno::XComponentContext >const& xContext );
     virtual ~ScVbaWorkbook() {}
 
diff --git a/sc/source/ui/vba/vbaworksheet.cxx b/sc/source/ui/vba/vbaworksheet.cxx
index 415c0eaf4858..d9051aab94ab 100644
--- a/sc/source/ui/vba/vbaworksheet.cxx
+++ b/sc/source/ui/vba/vbaworksheet.cxx
@@ -240,7 +240,7 @@ ScVbaWorksheet::createSheetCopyInNewDoc(const OUString& aCurrSheetName)
 }
 
 css::uno::Reference< ov::excel::XWorksheet >
-ScVbaWorksheet::createSheetCopy(uno::Reference<excel::XWorksheet> xSheet, bool bAfter)
+ScVbaWorksheet::createSheetCopy(uno::Reference<excel::XWorksheet> const & xSheet, bool bAfter)
 {
     OUString aCurrSheetName = getName();
     ScVbaWorksheet* pDestSheet = excel::getImplFromDocModuleWrapper<ScVbaWorksheet>( xSheet );
diff --git a/sc/source/ui/vba/vbaworksheet.hxx b/sc/source/ui/vba/vbaworksheet.hxx
index cb670d8df813..2a6b66e51b55 100644
--- a/sc/source/ui/vba/vbaworksheet.hxx
+++ b/sc/source/ui/vba/vbaworksheet.hxx
@@ -78,7 +78,7 @@ public:
     { return mxSheet; }
     static const css::uno::Sequence<sal_Int8>& getUnoTunnelId();
     css::uno::Reference< ov::excel::XWorksheet > createSheetCopyInNewDoc( const OUString& );
-    css::uno::Reference< ov::excel::XWorksheet > createSheetCopy(css::uno::Reference< ov::excel::XWorksheet> xSheet, bool bAfter);
+    css::uno::Reference< ov::excel::XWorksheet > createSheetCopy(css::uno::Reference< ov::excel::XWorksheet> const & xSheet, bool bAfter);
 
     // Attributes
     virtual OUString SAL_CALL getName() throw (css::uno::RuntimeException, std::exception) override;
diff --git a/sc/source/ui/view/drawvie4.cxx b/sc/source/ui/view/drawvie4.cxx
index dbc8ef80fd00..cbbc3af03f1c 100644
--- a/sc/source/ui/view/drawvie4.cxx
+++ b/sc/source/ui/view/drawvie4.cxx
@@ -136,7 +136,7 @@ void ScDrawView::BeginDrag( vcl::Window* pWindow, const Point& rStartPos )
 
 namespace {
 
-void getRangeFromDataSource( uno::Reference< chart2::data::XDataSource > xDataSource, std::vector<OUString>& rRangeRep)
+void getRangeFromDataSource( uno::Reference< chart2::data::XDataSource > const & xDataSource, std::vector<OUString>& rRangeRep)
 {
     uno::Sequence<uno::Reference<chart2::data::XLabeledDataSequence> > xSeqs = xDataSource->getDataSequences();
     for (sal_Int32 i = 0, n = xSeqs.getLength(); i < n; ++i)
diff --git a/sc/source/ui/view/spelleng.cxx b/sc/source/ui/view/spelleng.cxx
index ffb20f53a761..93767c6755dd 100644
--- a/sc/source/ui/view/spelleng.cxx
+++ b/sc/source/ui/view/spelleng.cxx
@@ -277,7 +277,7 @@ void ScConversionEngineBase::FillFromCell( SCCOL nCol, SCROW nRow, SCTAB nTab )
 ScSpellingEngine::ScSpellingEngine(
         SfxItemPool* pEnginePoolP, ScViewData& rViewData,
         ScDocument* pUndoDoc, ScDocument* pRedoDoc,
-        css::uno::Reference< css::linguistic2::XSpellChecker1 > xSpeller ) :
+        css::uno::Reference< css::linguistic2::XSpellChecker1 > const & xSpeller ) :
     ScConversionEngineBase( pEnginePoolP, rViewData, pUndoDoc, pRedoDoc )
 {
     SetSpeller( xSpeller );