loplugin:stringviewparam: operator +=

Change-Id: I30ce1b5bd8fb168da7067c1967c5af2569df2653
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108512
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

57 files changed, 150 insertions, 79 deletions

diff --git a/basctl/source/basicide/localizationmgr.cxx b/basctl/source/basicide/localizationmgr.cxx
index 72408cd61ac0..806b3d8aacae 100644
--- a/basctl/source/basicide/localizationmgr.cxx
+++ b/basctl/source/basicide/localizationmgr.cxx
@@ -171,7 +171,7 @@ void LocalizationMgr::implEnableDisableResourceForAllLibraryDialogs( HandleResou
 
 static OUString implCreatePureResourceId
     ( std::u16string_view aDialogName, std::u16string_view aCtrlName,
-      const OUString& aPropName,
+      std::u16string_view aPropName,
       const Reference< XStringResourceManager >& xStringResourceManager )
 {
     sal_Int32 nUniqueId = xStringResourceManager->getUniqueNumericId();
diff --git a/basic/source/inc/iosys.hxx b/basic/source/inc/iosys.hxx
index 7fb75a2e113c..ca5c6b275bcc 100644
--- a/basic/source/inc/iosys.hxx
+++ b/basic/source/inc/iosys.hxx
@@ -88,7 +88,7 @@ class SbiIoSystem
     short     nChan;
     ErrCode   nError;
     void      ReadCon(OString&);
-    void      WriteCon(const OUString&);
+    void      WriteCon(std::u16string_view);
 public:
     SbiIoSystem();
    ~SbiIoSystem() COVERITY_NOEXCEPT_FALSE;
@@ -102,7 +102,7 @@ public:
     void  Close();
     void  Read(OString&);
     char  Read();
-    void  Write(const OUString&);
+    void  Write(std::u16string_view);
     // 0 == bad channel or no SvStream (nChannel=0..CHANNELS-1)
     SbiStream* GetStream( short nChannel ) const;
     void  CloseAll(); // JSM
diff --git a/basic/source/runtime/iosys.cxx b/basic/source/runtime/iosys.cxx
index 6fc681f48492..4c991c6676c7 100644
--- a/basic/source/runtime/iosys.cxx
+++ b/basic/source/runtime/iosys.cxx
@@ -744,7 +744,7 @@ char SbiIoSystem::Read()
     return ch;
 }
 
-void SbiIoSystem::Write(const OUString& rBuf)
+void SbiIoSystem::Write(std::u16string_view rBuf)
 {
     if( !nChan )
     {
@@ -806,7 +806,7 @@ void SbiIoSystem::ReadCon(OString& rIn)
 
 // output of a MessageBox, if there's a CR in the console-buffer
 
-void SbiIoSystem::WriteCon(const OUString& rText)
+void SbiIoSystem::WriteCon(std::u16string_view rText)
 {
     aOut += rText;
     sal_Int32 n1 = aOut.indexOf('\n');
diff --git a/chart2/source/controller/dialogs/ObjectNameProvider.cxx b/chart2/source/controller/dialogs/ObjectNameProvider.cxx
index 2a3d954a61fa..56dca8dde908 100644
--- a/chart2/source/controller/dialogs/ObjectNameProvider.cxx
+++ b/chart2/source/controller/dialogs/ObjectNameProvider.cxx
@@ -17,6 +17,10 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <ObjectNameProvider.hxx>
 #include <ResId.hxx>
 #include <strings.hrc>
@@ -80,11 +84,11 @@ OUString lcl_getFullSeriesName( const OUString& rObjectCID, const Reference< fra
     return aRet;
 }
 
-void lcl_addText( OUString& rOut, const OUString& rSeparator, const OUString& rNext )
+void lcl_addText( OUString& rOut, std::u16string_view rSeparator, std::u16string_view rNext )
 {
-    if( !(rOut.isEmpty() || rNext.isEmpty()) )
+    if( !(rOut.isEmpty() || rNext.empty()) )
         rOut+=rSeparator;
-    if( !rNext.isEmpty() )
+    if( !rNext.empty() )
         rOut+=rNext;
 }
 
diff --git a/compilerplugins/clang/stringviewparam.cxx b/compilerplugins/clang/stringviewparam.cxx
index 9d3aac5fed0a..a96d8cad4929 100644
--- a/compilerplugins/clang/stringviewparam.cxx
+++ b/compilerplugins/clang/stringviewparam.cxx
@@ -195,6 +195,14 @@ SmallVector<DeclRefExpr const*, 2> relevantCXXOperatorCallExpr(CXXOperatorCallEx
         }
         return v;
     }
+    if (op == OO_PlusEqual)
+    {
+        if (relevantStringType(expr->getArg(0)->getType()) != StringType::RtlOustring)
+        {
+            return {};
+        }
+        return wrap(relevantDeclRefExpr(expr->getArg(1)));
+    }
     return {};
 }
 
diff --git a/connectivity/source/drivers/dbase/DTable.cxx b/connectivity/source/drivers/dbase/DTable.cxx
index 4f3e07be5938..fece1bf7fb21 100644
--- a/connectivity/source/drivers/dbase/DTable.cxx
+++ b/connectivity/source/drivers/dbase/DTable.cxx
@@ -58,6 +58,7 @@
 #include <algorithm>
 #include <cassert>
 #include <memory>
+#include <string_view>
 
 using namespace ::comphelper;
 using namespace connectivity;
@@ -2270,7 +2271,7 @@ void SAL_CALL ODbaseTable::rename( const OUString& newName )
 }
 namespace
 {
-    void renameFile(file::OConnection const * _pConnection,const OUString& oldName,
+    void renameFile(file::OConnection const * _pConnection,std::u16string_view oldName,
                     const OUString& newName,const OUString& _sExtension)
     {
         OUString aName = ODbaseTable::getEntry(_pConnection,oldName);
diff --git a/cui/source/dialogs/toolbarmodedlg.cxx b/cui/source/dialogs/toolbarmodedlg.cxx
index e15f54e830cb..4f5df939e948 100644
--- a/cui/source/dialogs/toolbarmodedlg.cxx
+++ b/cui/source/dialogs/toolbarmodedlg.cxx
@@ -141,13 +141,13 @@ int ToolbarmodeDialog::GetActiveRadioButton()
     return -1;
 }
 
-void ToolbarmodeDialog::UpdateImage(OUString sFileName)
+void ToolbarmodeDialog::UpdateImage(std::u16string_view sFileName)
 {
     // load image
     OUString aURL("$BRAND_BASE_DIR/$BRAND_SHARE_SUBDIR/toolbarmode/");
     rtl::Bootstrap::expandMacros(aURL);
     aURL += sFileName;
-    if (sFileName.isEmpty() || !file_exists(aURL))
+    if (sFileName.empty() || !file_exists(aURL))
         return;
     // draw image
     Graphic aGraphic;
diff --git a/cui/source/inc/toolbarmodedlg.hxx b/cui/source/inc/toolbarmodedlg.hxx
index 40d6dc835851..8d0216734a75 100644
--- a/cui/source/inc/toolbarmodedlg.hxx
+++ b/cui/source/inc/toolbarmodedlg.hxx
@@ -9,6 +9,10 @@
 
 #pragma once
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <vcl/weld.hxx>
 
 class ToolbarmodeDialog : public weld::GenericDialogController
@@ -24,7 +28,7 @@ private:
     std::unique_ptr<weld::RadioButton> m_pRadioButtons[9];
     std::unique_ptr<weld::Label> m_pInfoLabel;
 
-    void UpdateImage(OUString sFileName);
+    void UpdateImage(std::u16string_view sFileName);
     int GetActiveRadioButton();
     DECL_LINK(SelectToolbarmode, weld::ToggleButton&, void);
     DECL_LINK(OnApplyClick, weld::Button&, void);
diff --git a/editeng/inc/editdoc.hxx b/editeng/inc/editdoc.hxx
index ff2681e3ca5e..9b35cfeaa028 100644
--- a/editeng/inc/editdoc.hxx
+++ b/editeng/inc/editdoc.hxx
@@ -31,6 +31,7 @@
 #include <o3tl/typed_flags_set.hxx>
 
 #include <memory>
+#include <string_view>
 #include <vector>
 
 class ImpEditEngine;
@@ -287,7 +288,7 @@ public:
 
     void SetChar(sal_Int32 nPos, sal_Unicode c);
     void Insert(const OUString& rStr, sal_Int32 nPos);
-    void Append(const OUString& rStr);
+    void Append(std::u16string_view rStr);
     void Erase(sal_Int32 nPos);
     void Erase(sal_Int32 nPos, sal_Int32 nCount);
     OUString Copy(sal_Int32 nPos) const;
diff --git a/editeng/source/editeng/editdoc.cxx b/editeng/source/editeng/editdoc.cxx
index 11d18adae056..e1a9c91e3ee5 100644
--- a/editeng/source/editeng/editdoc.cxx
+++ b/editeng/source/editeng/editdoc.cxx
@@ -1724,7 +1724,7 @@ void ContentNode::Insert(const OUString& rStr, sal_Int32 nPos)
     maString = maString.replaceAt(nPos, 0, rStr);
 }
 
-void ContentNode::Append(const OUString& rStr)
+void ContentNode::Append(std::u16string_view rStr)
 {
     maString += rStr;
 }
diff --git a/i18nlangtag/source/languagetag/languagetag.cxx b/i18nlangtag/source/languagetag/languagetag.cxx
index 148a102a5733..ef5e4cf518a4 100644
--- a/i18nlangtag/source/languagetag/languagetag.cxx
+++ b/i18nlangtag/source/languagetag/languagetag.cxx
@@ -1950,7 +1950,7 @@ OUString LanguageTagImpl::getGlibcLocaleString() const
     return maCachedGlibcString;
 }
 
-OUString LanguageTag::getGlibcLocaleString( const OUString & rEncoding ) const
+OUString LanguageTag::getGlibcLocaleString( std::u16string_view rEncoding ) const
 {
     OUString aRet;
     if (isIsoLocale())
@@ -1966,7 +1966,7 @@ OUString LanguageTag::getGlibcLocaleString( const OUString & rEncoding ) const
         aRet = getImpl()->getGlibcLocaleString();
         sal_Int32 nAt = aRet.indexOf('@');
         if (nAt != -1)
-            aRet = aRet.subView(0, nAt) + rEncoding + aRet.subView(nAt);
+            aRet = OUString::Concat(aRet.subView(0, nAt)) + rEncoding + aRet.subView(nAt);
         else
             aRet += rEncoding;
     }
diff --git a/i18npool/source/localedata/LocaleNode.hxx b/i18npool/source/localedata/LocaleNode.hxx
index b187cc9adbd9..9706948419bf 100644
--- a/i18npool/source/localedata/LocaleNode.hxx
+++ b/i18npool/source/localedata/LocaleNode.hxx
@@ -87,7 +87,7 @@ protected:
 
 public:
     LocaleNode (const OUString& name, const Reference< XAttributeList > & attr);
-    void setValue(const OUString &oValue) { aValue += oValue; };
+    void setValue(std::u16string_view oValue) { aValue += oValue; };
     const OUString& getName() const { return aName; };
     const OUString& getValue() const { return aValue; };
     const Attr& getAttr() const { return aAttribs; };
diff --git a/include/i18nlangtag/languagetag.hxx b/include/i18nlangtag/languagetag.hxx
index d7c1c8787a53..62957f1f7f70 100644
--- a/include/i18nlangtag/languagetag.hxx
+++ b/include/i18nlangtag/languagetag.hxx
@@ -224,7 +224,7 @@ public:
         @return The resulting GLIBC locale string if it could be constructed,
                 if not an empty string is returned.
      */
-    OUString                        getGlibcLocaleString( const OUString & rEncoding ) const;
+    OUString                        getGlibcLocaleString( std::u16string_view rEncoding ) const;
 
     /** If language tag has a non-default script specified.
      */
diff --git a/include/oox/mathml/importutils.hxx b/include/oox/mathml/importutils.hxx
index 851b2564a100..9ab79a6f0858 100644
--- a/include/oox/mathml/importutils.hxx
+++ b/include/oox/mathml/importutils.hxx
@@ -10,6 +10,7 @@
 #define INCLUDED_OOX_MATHML_IMPORTUTILS_HXX
 
 #include <map>
+#include <string_view>
 #include <vector>
 
 #include <com/sun/star/uno/Reference.hxx>
@@ -229,7 +230,7 @@ public:
     void appendOpeningTag(int token, const AttributeList& attribs);
     void appendClosingTag(int token);
     // appends the characters after the last appended token
-    void appendCharacters(const OUString& characters);
+    void appendCharacters(std::u16string_view characters);
 };
 
 inline OUString XmlStream::Tag::attribute(int t, const OUString& def) const
diff --git a/include/sfx2/linkmgr.hxx b/include/sfx2/linkmgr.hxx
index 4a159e16df3e..fcd91ea81f0d 100644
--- a/include/sfx2/linkmgr.hxx
+++ b/include/sfx2/linkmgr.hxx
@@ -96,7 +96,7 @@ public:
     // the links connect to a SvLinkSource and adds to the list
     void        InsertDDELink( SvBaseLink*,
                         const OUString& rServer,
-                        const OUString& rTopic,
+                        std::u16string_view rTopic,
                         std::u16string_view rItem );
 
     // if everything is already set at the link!
@@ -176,7 +176,7 @@ const sal_Unicode cTokenSeparator = 0xFFFF;
 // - File-/Graphics-LinkNames the last 3 Strings (FileName, Region, Filter)
 SFX2_DLLPUBLIC void MakeLnkName( OUString& rName,
                  const OUString* pType,       // Can also be null!!
-                 const OUString& rFile,
+                 std::u16string_view rFile,
                  std::u16string_view rLink,
                  const OUString* pFilter = nullptr );
 
diff --git a/include/svx/tbxcolor.hxx b/include/svx/tbxcolor.hxx
index b98b0be7b326..86dff9a9249f 100644
--- a/include/svx/tbxcolor.hxx
+++ b/include/svx/tbxcolor.hxx
@@ -19,6 +19,10 @@
 
 #pragma once
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <com/sun/star/frame/XLayoutManager.hpp>
 #include <svx/svxdllapi.h>
 
@@ -37,7 +41,7 @@ namespace svx
             css::frame::XLayoutManager >   m_xLayouter;
 
     public:
-        ToolboxAccess( const OUString& rToolboxName );
+        ToolboxAccess( std::u16string_view rToolboxName );
 
     public:
         /** toggles the toolbox
diff --git a/include/unotools/fontdefs.hxx b/include/unotools/fontdefs.hxx
index 887041f6f15b..ad1d6726f17e 100644
--- a/include/unotools/fontdefs.hxx
+++ b/include/unotools/fontdefs.hxx
@@ -19,6 +19,10 @@
 #ifndef INCLUDED_UNOTOOLS_FONTDEFS_HXX
 #define INCLUDED_UNOTOOLS_FONTDEFS_HXX
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <unotools/unotoolsdllapi.h>
 #include <sal/types.h>
 #include <rtl/ustring.hxx>
@@ -38,7 +42,7 @@ namespace o3tl
 
 UNOTOOLS_DLLPUBLIC OUString GetSubsFontName( const OUString& rName, SubsFontFlags nFlags );
 
-UNOTOOLS_DLLPUBLIC void AddTokenFontName( OUString& rName, const OUString& rNewToken );
+UNOTOOLS_DLLPUBLIC void AddTokenFontName( OUString& rName, std::u16string_view rNewToken );
 
 
 class UNLESS_MERGELIBS(UNOTOOLS_DLLPUBLIC) ConvertChar
diff --git a/lotuswordpro/source/filter/lwppara.hxx b/lotuswordpro/source/filter/lwppara.hxx
index 4815d1661a9b..bfb1dcb82b9a 100644
--- a/lotuswordpro/source/filter/lwppara.hxx
+++ b/lotuswordpro/source/filter/lwppara.hxx
@@ -67,6 +67,7 @@
 #include <lwpobj.hxx>
 #include <lwpobjstrm.hxx>
 
+#include <string_view>
 #include <vector>
 #include "lwpdlvlist.hxx"
 #include <lwpbasetype.hxx>
@@ -184,7 +185,7 @@ public:
 
     bool IsInCell();
 
-    void SetAllText(const OUString& sText);
+    void SetAllText(std::u16string_view sText);
 
 protected:
     sal_uInt32  m_nOrdinal; // Ordinal number of this paragraph
diff --git a/lotuswordpro/source/filter/lwppara1.cxx b/lotuswordpro/source/filter/lwppara1.cxx
index 4a32be862b5b..621a0bdac6b3 100644
--- a/lotuswordpro/source/filter/lwppara1.cxx
+++ b/lotuswordpro/source/filter/lwppara1.cxx
@@ -99,7 +99,7 @@ OUString const & LwpPara::GetContentText(bool bAllText)
 /**
  * @short   set text of paragraph
  */
-void LwpPara::SetAllText(const OUString& sText)
+void LwpPara::SetAllText(std::u16string_view sText)
 {
     m_AllText+=sText;
 }
diff --git a/oox/source/mathml/importutils.cxx b/oox/source/mathml/importutils.cxx
index caeaf7de05f8..962528acba2a 100644
--- a/oox/source/mathml/importutils.cxx
+++ b/oox/source/mathml/importutils.cxx
@@ -326,7 +326,7 @@ void XmlStreamBuilder::appendClosingTag( int token )
     tags.emplace_back( CLOSING( token ));
 }
 
-void XmlStreamBuilder::appendCharacters( const OUString& chars )
+void XmlStreamBuilder::appendCharacters( std::u16string_view chars )
 {
     assert( !tags.empty());
     tags.back().text += chars;
diff --git a/sc/source/core/data/table4.cxx b/sc/source/core/data/table4.cxx
index d878070f64ea..4db88f60bb7c 100644
--- a/sc/source/core/data/table4.cxx
+++ b/sc/source/core/data/table4.cxx
@@ -49,6 +49,7 @@
 #include <math.h>
 #include <memory>
 #include <list>
+#include <string_view>
 
 #define D_MAX_LONG_  double(0x7fffffff)
 
@@ -133,7 +134,8 @@ OUString lcl_ValueString( sal_Int32 nValue, sal_uInt16 nMinDigits )
 }
 
 void setSuffixCell(
-    ScColumn& rColumn, SCROW nRow, sal_Int32 nValue, sal_uInt16 nDigits, const OUString& rSuffix,
+    ScColumn& rColumn, SCROW nRow, sal_Int32 nValue, sal_uInt16 nDigits,
+    std::u16string_view rSuffix,
     CellType eCellType, bool bIsOrdinalSuffix )
 {
     ScDocument& rDoc = rColumn.GetDoc();
diff --git a/sc/source/filter/excel/xepivot.cxx b/sc/source/filter/excel/xepivot.cxx
index 7f8ace82683f..8156b4579499 100644
--- a/sc/source/filter/excel/xepivot.cxx
+++ b/sc/source/filter/excel/xepivot.cxx
@@ -29,6 +29,7 @@
 
 #include <algorithm>
 #include <math.h>
+#include <string_view>
 
 #include <osl/diagnose.h>
 #include <sot/storage.hxx>
@@ -865,7 +866,7 @@ void XclExpPivotCache::WriteSxindexlistList( XclExpStream& rStrm ) const
 namespace {
 
 /** Returns a display string for a data field containing the field name and aggregation function. */
-OUString lclGetDataFieldCaption( const OUString& rFieldName, ScGeneralFunction eFunc )
+OUString lclGetDataFieldCaption( std::u16string_view rFieldName, ScGeneralFunction eFunc )
 {
     OUString aCaption;
 
diff --git a/sc/source/filter/html/htmlexp.cxx b/sc/source/filter/html/htmlexp.cxx
index 684a6727839a..f7e04a15c3c8 100644
--- a/sc/source/filter/html/htmlexp.cxx
+++ b/sc/source/filter/html/htmlexp.cxx
@@ -17,6 +17,10 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <scitems.hxx>
 #include <editeng/eeitem.hxx>
 
@@ -148,7 +152,7 @@ static OString lcl_getColGroupString(sal_Int32 nSpan, sal_Int32 nWidth)
     return aByteStr.makeStringAndClear();
 }
 
-static void lcl_AddStamp( OUString& rStr, const OUString& rName,
+static void lcl_AddStamp( OUString& rStr, std::u16string_view rName,
     const css::util::DateTime& rDateTime,
     const LocaleDataWrapper& rLoc )
 {
@@ -161,7 +165,7 @@ static void lcl_AddStamp( OUString& rStr, const OUString& rName,
     OUString        aStrTime    = rLoc.getTime( aDateTime );
 
     rStr += GLOBSTR( STR_BY ) + " ";
-    if (!rName.isEmpty())
+    if (!rName.empty())
         rStr += rName;
     else
         rStr += "???";
diff --git a/sc/source/filter/inc/pagesettings.hxx b/sc/source/filter/inc/pagesettings.hxx
index 13e7eba7f779..ff0e0a035ace 100644
--- a/sc/source/filter/inc/pagesettings.hxx
+++ b/sc/source/filter/inc/pagesettings.hxx
@@ -21,6 +21,8 @@
 #define INCLUDED_SC_SOURCE_FILTER_INC_PAGESETTINGS_HXX
 
 #include <memory>
+#include <string_view>
+
 #include "worksheethelper.hxx"
 
 namespace oox { class AttributeList; }
@@ -96,7 +98,8 @@ public:
     /** Imports header and footer settings from a headerFooter element. */
     void                importHeaderFooter( const AttributeList& rAttribs );
     /** Imports header/footer characters from a headerFooter element. */
-    void                importHeaderFooterCharacters( const OUString& rChars, sal_Int32 nElement );
+    void                importHeaderFooterCharacters(
+        std::u16string_view rChars, sal_Int32 nElement );
     /** Imports the picture element. */
     void                importPicture( const ::oox::core::Relations& rRelations, const AttributeList& rAttribs );
 
diff --git a/sc/source/filter/oox/pagesettings.cxx b/sc/source/filter/oox/pagesettings.cxx
index b19caea83634..d6fd828c79dd 100644
--- a/sc/source/filter/oox/pagesettings.cxx
+++ b/sc/source/filter/oox/pagesettings.cxx
@@ -212,7 +212,7 @@ void PageSettings::importHeaderFooter( const AttributeList& rAttribs )
     maModel.mbUseFirstHF = rAttribs.getBool( XML_differentFirst, false );
 }
 
-void PageSettings::importHeaderFooterCharacters( const OUString& rChars, sal_Int32 nElement )
+void PageSettings::importHeaderFooterCharacters( std::u16string_view rChars, sal_Int32 nElement )
 {
     switch( nElement )
     {
diff --git a/sd/inc/glob.hxx b/sd/inc/glob.hxx
index 884d16032719..b4560c0a8a5a 100644
--- a/sd/inc/glob.hxx
+++ b/sd/inc/glob.hxx
@@ -48,8 +48,8 @@
 #define SD_LT_SEPARATOR "~LT~"
 
 // option-stream identifier
-#define SD_OPTION_MORPHING  "Morph"
-#define SD_OPTION_VECTORIZE "Vectorize"
+#define SD_OPTION_MORPHING  u"Morph"
+#define SD_OPTION_VECTORIZE u"Vectorize"
 
 #endif // _ INCLUDED_SD_INC_GLOB_HXX
 
diff --git a/sd/inc/sdmod.hxx b/sd/inc/sdmod.hxx
index 42c4ea4e85bc..7789b896b871 100644
--- a/sd/inc/sdmod.hxx
+++ b/sd/inc/sdmod.hxx
@@ -33,6 +33,7 @@
 #include <vcl/virdev.hxx>
 #include <map>
 #include <memory>
+#include <string_view>
 
 class SdOptions;
 class SvxSearchItem;
@@ -92,7 +93,7 @@ public:
     void                    GetState(SfxItemSet&);
 
     SdOptions*              GetSdOptions(DocumentType eDocType);
-    SD_DLLPUBLIC tools::SvRef<SotStorageStream>     GetOptionStream( const OUString& rOptionName, SdOptionStreamMode eMode );
+    SD_DLLPUBLIC tools::SvRef<SotStorageStream>     GetOptionStream( std::u16string_view rOptionName, SdOptionStreamMode eMode );
 
     bool                    GetWaterCan() const { return bWaterCan; }
     void                    SetWaterCan( bool bWC ) { bWaterCan = bWC; }
diff --git a/sd/inc/sdpage.hxx b/sd/inc/sdpage.hxx
index 56398c331cfd..cca449bcce8d 100644
--- a/sd/inc/sdpage.hxx
+++ b/sd/inc/sdpage.hxx
@@ -200,7 +200,7 @@ public:
     objects are removed with this mechanism instead of RemoveObject*/
     virtual SdrObject* ReplaceObject(SdrObject* pNewObj, size_t nObjNum) override;
 
-    void        SetObjText(SdrTextObj* pObj, SdrOutliner* pOutliner, PresObjKind eObjKind, const OUString& rStr );
+    void        SetObjText(SdrTextObj* pObj, SdrOutliner* pOutliner, PresObjKind eObjKind, std::u16string_view rStr );
 
     void        SetPageKind(PageKind ePgType)        { mePageKind = ePgType; }
     PageKind    GetPageKind() const                  { return mePageKind; }
diff --git a/sd/source/core/sdpage.cxx b/sd/source/core/sdpage.cxx
index 798d48b2543e..bc876afdac0a 100644
--- a/sd/source/core/sdpage.cxx
+++ b/sd/source/core/sdpage.cxx
@@ -2374,7 +2374,7 @@ void SdPage::InsertPresObj(SdrObject* pObj, PresObjKind eKind )
 |*
 \************************************************************************/
 
-void SdPage::SetObjText(SdrTextObj* pObj, SdrOutliner* pOutliner, PresObjKind eObjKind, const OUString& rString )
+void SdPage::SetObjText(SdrTextObj* pObj, SdrOutliner* pOutliner, PresObjKind eObjKind, std::u16string_view rString )
 {
     if ( !pObj )
         return;
@@ -2414,7 +2414,7 @@ void SdPage::SetObjText(SdrTextObj* pObj, SdrOutliner* pOutliner, PresObjKind eO
         {
             pOutl->Init( OutlinerMode::OutlineObject );
 
-            aString += "\t" + rString;
+            aString += OUString::Concat("\t") + rString;
 
             if (mbMaster)
             {
diff --git a/sd/source/ui/app/sdmod.cxx b/sd/source/ui/app/sdmod.cxx
index 27fea87ae28b..482a6d6bca4f 100644
--- a/sd/source/ui/app/sdmod.cxx
+++ b/sd/source/ui/app/sdmod.cxx
@@ -162,7 +162,7 @@ SdOptions* SdModule::GetSdOptions(DocumentType eDocType)
  * if the stream is opened for reading but does not exist, an 'empty'
  * RefObject is returned
  */
-tools::SvRef<SotStorageStream> SdModule::GetOptionStream( const OUString& rOptionName,
+tools::SvRef<SotStorageStream> SdModule::GetOptionStream( std::u16string_view rOptionName,
                                               SdOptionStreamMode eMode )
 {
     ::sd::DrawDocShell*     pDocSh = dynamic_cast< ::sd::DrawDocShell *>( SfxObjectShell::Current() );
diff --git a/sdext/source/presenter/PresenterHelpView.cxx b/sdext/source/presenter/PresenterHelpView.cxx
index 18fcb3d3c21b..d6b625e53183 100644
--- a/sdext/source/presenter/PresenterHelpView.cxx
+++ b/sdext/source/presenter/PresenterHelpView.cxx
@@ -31,6 +31,7 @@
 #include <com/sun/star/util/Color.hpp>
 #include <algorithm>
 #include <numeric>
+#include <string_view>
 #include <vector>
 
 using namespace ::com::sun::star;
@@ -50,7 +51,7 @@ namespace {
     public:
         LineDescriptor();
         void AddPart (
-            const OUString& rsLine,
+            std::u16string_view rsLine,
             const css::uno::Reference<css::rendering::XCanvasFont>& rxFont);
         bool IsEmpty() const;
 
@@ -503,7 +504,7 @@ LineDescriptor::LineDescriptor()
 }
 
 void LineDescriptor::AddPart (
-    const OUString& rsLine,
+    std::u16string_view rsLine,
     const css::uno::Reference<css::rendering::XCanvasFont>& rxFont)
 {
     msLine += rsLine;
@@ -689,7 +690,7 @@ void LineDescriptorList::FormatText (
                         nIndex = nLength;
                     }
 
-                    aLineDescriptor.AddPart(iPart->copy(nStart, nIndex-nStart), rxFont);
+                    aLineDescriptor.AddPart(iPart->subView(nStart, nIndex-nStart), rxFont);
                     if (nIndex != nLength)
                     {
                         mpLineDescriptors->push_back(aLineDescriptor);
@@ -706,14 +707,14 @@ void LineDescriptorList::FormatText (
         else if (PresenterCanvasHelper::GetTextSize(
             rxFont, aLineDescriptor.msLine+", "+*iPart).Width > nMaximalWidth)
         {
-            aLineDescriptor.AddPart(",", rxFont);
+            aLineDescriptor.AddPart(u",", rxFont);
             mpLineDescriptors->push_back(aLineDescriptor);
             aLineDescriptor = LineDescriptor();
             continue;
         }
         else
         {
-            aLineDescriptor.AddPart(", "+*iPart, rxFont);
+            aLineDescriptor.AddPart(OUString(", "+*iPart), rxFont);
         }
         ++iPart;
     }
diff --git a/sfx2/source/appl/linkmgr2.cxx b/sfx2/source/appl/linkmgr2.cxx
index e63c9b910d5e..ed980af3d90a 100644
--- a/sfx2/source/appl/linkmgr2.cxx
+++ b/sfx2/source/appl/linkmgr2.cxx
@@ -187,7 +187,7 @@ bool LinkManager::InsertLink( SvBaseLink * pLink,
 
 void LinkManager::InsertDDELink( SvBaseLink * pLink,
                                     const OUString& rServer,
-                                    const OUString& rTopic,
+                                    std::u16string_view rTopic,
                                     std::u16string_view rItem )
 {
     if( !isClientType( pLink->GetObjType() ) )
@@ -375,7 +375,7 @@ void LinkManager::RemoveServer( SvLinkSource* pObj )
     aServerTbl.erase( pObj );
 }
 
-void MakeLnkName( OUString& rName, const OUString* pType, const OUString& rFile,
+void MakeLnkName( OUString& rName, const OUString* pType, std::u16string_view rFile,
                     std::u16string_view rLink, const OUString* pFilter )
 {
     if( pType )
diff --git a/svgio/inc/svgcharacternode.hxx b/svgio/inc/svgcharacternode.hxx
index 988c30001df9..46d7ec995b18 100644
--- a/svgio/inc/svgcharacternode.hxx
+++ b/svgio/inc/svgcharacternode.hxx
@@ -20,6 +20,10 @@
 #ifndef INCLUDED_SVGIO_INC_SVGCHARACTERNODE_HXX
 #define INCLUDED_SVGIO_INC_SVGCHARACTERNODE_HXX
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include "svgnode.hxx"
 
 namespace drawinglayer::primitive2d { class TextSimplePortionPrimitive2D; }
@@ -148,7 +152,7 @@ namespace svgio::svgreader
             void decomposeText(drawinglayer::primitive2d::Primitive2DContainer& rTarget, SvgTextPosition& rSvgTextPosition) const;
             void whiteSpaceHandling();
             void addGap();
-            void concatenate(const OUString& rText);
+            void concatenate(std::u16string_view rText);
 
             /// Text content
             const OUString& getText() const { return maText; }
diff --git a/svgio/inc/svgtitledescnode.hxx b/svgio/inc/svgtitledescnode.hxx
index 0c8eae4b94f6..50eb5bc73ee2 100644
--- a/svgio/inc/svgtitledescnode.hxx
+++ b/svgio/inc/svgtitledescnode.hxx
@@ -19,6 +19,10 @@
 #ifndef INCLUDED_SVGIO_INC_SVGTITLEDESCNODE_HXX
 #define INCLUDED_SVGIO_INC_SVGTITLEDESCNODE_HXX
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include "svgnode.hxx"
 
 
@@ -38,7 +42,7 @@ namespace svgio::svgreader
             virtual ~SvgTitleDescNode() override;
 
             /// add new chars
-            void concatenate(const OUString& rChars);
+            void concatenate(std::u16string_view rChars);
 
             /// x content, set if found in current context
             const OUString& getText() const { return maText; }
diff --git a/svgio/source/svgreader/svgcharacternode.cxx b/svgio/source/svgreader/svgcharacternode.cxx
index 457039e1ba82..dc24adc7ffc0 100644
--- a/svgio/source/svgreader/svgcharacternode.cxx
+++ b/svgio/source/svgreader/svgcharacternode.cxx
@@ -539,7 +539,7 @@ namespace svgio::svgreader
             maText += " ";
         }
 
-        void SvgCharacterNode::concatenate(const OUString& rText)
+        void SvgCharacterNode::concatenate(std::u16string_view rText)
         {
             maText += rText;
         }
diff --git a/svgio/source/svgreader/svgtitledescnode.cxx b/svgio/source/svgreader/svgtitledescnode.cxx
index 9ff26e1a7e95..0475a8275c88 100644
--- a/svgio/source/svgreader/svgtitledescnode.cxx
+++ b/svgio/source/svgreader/svgtitledescnode.cxx
@@ -37,7 +37,7 @@ namespace svgio::svgreader
         {
         }
 
-        void SvgTitleDescNode::concatenate(const OUString& rChars)
+        void SvgTitleDescNode::concatenate(std::u16string_view rChars)
         {
             maText += rChars;
         }
diff --git a/svtools/source/config/extcolorcfg.cxx b/svtools/source/config/extcolorcfg.cxx
index 397d83b1cf94..1fa91e645dc2 100644
--- a/svtools/source/config/extcolorcfg.cxx
+++ b/svtools/source/config/extcolorcfg.cxx
@@ -217,7 +217,7 @@ void ExtendedColorConfig_Impl::EnableBroadcast()
         ExtendedColorConfig::m_pImpl->m_bIsBroadcastEnabled = true;
 }
 
-static void lcl_addString(uno::Sequence < OUString >& _rSeq,const OUString& _sAdd)
+static void lcl_addString(uno::Sequence < OUString >& _rSeq,std::u16string_view _sAdd)
 {
     for(OUString & i : _rSeq)
         i += _sAdd;
@@ -319,7 +319,7 @@ void ExtendedColorConfig_Impl::FillComponentColors(const uno::Sequence < OUStrin
 
             const OUString sColor("/Color");
             lcl_addString(aColorNames,sColor);
-            lcl_addString(aDefaultColorNames,"/DefaultColor");
+            lcl_addString(aDefaultColorNames,u"/DefaultColor");
             uno::Sequence< uno::Any > aColors = GetProperties( aColorNames );
             const uno::Any* pColors = aColors.getConstArray();
 
diff --git a/svx/source/tbxctrls/grafctrl.cxx b/svx/source/tbxctrls/grafctrl.cxx
index 95c0ee341087..a88e0f5b59b8 100644
--- a/svx/source/tbxctrls/grafctrl.cxx
+++ b/svx/source/tbxctrls/grafctrl.cxx
@@ -60,7 +60,7 @@ using namespace ::com::sun::star::util;
 using namespace ::com::sun::star::beans;
 using namespace ::com::sun::star::lang;
 
-#define TOOLBOX_NAME                "colorbar"
+#define TOOLBOX_NAME                u"colorbar"
 #define RID_SVXSTR_UNDO_GRAFCROP    RID_SVXSTR_GRAFCROP
 
 namespace {
diff --git a/svx/source/tbxctrls/tbxcolor.cxx b/svx/source/tbxctrls/tbxcolor.cxx
index e87e1910f58e..f3dbbe096ce3 100644
--- a/svx/source/tbxctrls/tbxcolor.cxx
+++ b/svx/source/tbxctrls/tbxcolor.cxx
@@ -33,7 +33,7 @@ namespace svx
     using namespace ::com::sun::star::frame;
     using namespace ::com::sun::star::beans;
 
-    ToolboxAccess::ToolboxAccess( const OUString& rToolboxName ) :
+    ToolboxAccess::ToolboxAccess( std::u16string_view rToolboxName ) :
         m_sToolboxResName   ( "private:resource/toolbar/" )
     {
         m_sToolboxResName += rToolboxName;
diff --git a/sw/inc/docufld.hxx b/sw/inc/docufld.hxx
index 5da1a4729bcb..f3a2cdc14b4c 100644
--- a/sw/inc/docufld.hxx
+++ b/sw/inc/docufld.hxx
@@ -19,6 +19,10 @@
 #ifndef INCLUDED_SW_INC_DOCUFLD_HXX
 #define INCLUDED_SW_INC_DOCUFLD_HXX
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <tools/solar.h>
 #include <tools/date.hxx>
 #include <tools/datetime.hxx>
@@ -417,7 +421,7 @@ public:
     virtual bool        PutValue( const css::uno::Any& rVal, sal_uInt16 nWhich ) override;
 
     static void CreateMacroString( OUString& rMacro,
-                                   const OUString& rMacroName,
+                                   std::u16string_view rMacroName,
                                    const OUString& rLibraryName );
 
     static bool isScriptURL( const OUString& str );
diff --git a/sw/source/core/doc/doclay.cxx b/sw/source/core/doc/doclay.cxx
index e308e467571b..b586536403c1 100644
--- a/sw/source/core/doc/doclay.cxx
+++ b/sw/source/core/doc/doclay.cxx
@@ -628,7 +628,7 @@ static void lcl_CpyAttr( SfxItemSet &rNewSet, const SfxItemSet &rOldSet, sal_uIn
 static SwFlyFrameFormat *
 lcl_InsertLabel(SwDoc & rDoc, SwTextFormatColls *const pTextFormatCollTable,
         SwUndoInsertLabel *const pUndo,
-        SwLabelType const eType, OUString const& rText, OUString const& rSeparator,
+        SwLabelType const eType, std::u16string_view rText, std::u16string_view rSeparator,
             const OUString& rNumberingSeparator,
             const bool bBefore, const sal_uInt16 nId, const sal_uLong nNdIdx,
             const OUString& rCharacterStyle,
@@ -896,7 +896,7 @@ lcl_InsertLabel(SwDoc & rDoc, SwTextFormatColls *const pTextFormatCollTable,
                 aText += " ";
         }
         sal_Int32 nIdx = aText.getLength();
-        if( !rText.isEmpty() )
+        if( !rText.empty() )
         {
             aText += rSeparator;
         }
diff --git a/sw/source/core/fields/macrofld.cxx b/sw/source/core/fields/macrofld.cxx
index c9fd26870f99..2430a859afbe 100644
--- a/sw/source/core/fields/macrofld.cxx
+++ b/sw/source/core/fields/macrofld.cxx
@@ -194,12 +194,12 @@ bool SwMacroField::PutValue( const uno::Any& rAny, sal_uInt16 nWhichId )
 /// create an internally used macro name from the library and macro name parts
 void SwMacroField::CreateMacroString(
     OUString& rMacro,
-    const OUString& rMacroName,
+    std::u16string_view rMacroName,
     const OUString& rLibraryName )
 {
     // concatenate library and name; use dot only if both strings have content
     rMacro = rLibraryName;
-    if ( !rLibraryName.isEmpty() && !rMacroName.isEmpty() )
+    if ( !rLibraryName.isEmpty() && !rMacroName.empty() )
         rMacro += ".";
     rMacro += rMacroName;
 }
diff --git a/sw/source/core/text/porftn.hxx b/sw/source/core/text/porftn.hxx
index 758d76dfde74..bbaad2aa751b 100644
--- a/sw/source/core/text/porftn.hxx
+++ b/sw/source/core/text/porftn.hxx
@@ -19,6 +19,10 @@
 
 #pragma once
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include "porfld.hxx"
 
 class SwTextFootnote;
@@ -89,7 +93,7 @@ public:
 class SwErgoSumPortion : public SwFieldPortion
 {
 public:
-    SwErgoSumPortion( const OUString &rExp, const OUString& rStr );
+    SwErgoSumPortion( const OUString &rExp, std::u16string_view rStr );
     virtual TextFrameIndex GetModelPositionForViewPoint(sal_uInt16 nOfst) const override;
     virtual bool Format( SwTextFormatInfo &rInf ) override;
 
diff --git a/sw/source/core/text/txtftn.cxx b/sw/source/core/text/txtftn.cxx
index 19880e023d7f..ea326a91ae3f 100644
--- a/sw/source/core/text/txtftn.cxx
+++ b/sw/source/core/text/txtftn.cxx
@@ -17,6 +17,10 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <viewsh.hxx>
 #include <doc.hxx>
 #include <IDocumentLayoutAccess.hxx>
@@ -1470,10 +1474,10 @@ void SwQuoVadisPortion::Paint( const SwTextPaintInfo &rInf ) const
 
 SwFieldPortion *SwErgoSumPortion::Clone( const OUString &rExpand ) const
 {
-    return new SwErgoSumPortion( rExpand, OUString() );
+    return new SwErgoSumPortion( rExpand, std::u16string_view() );
 }
 
-SwErgoSumPortion::SwErgoSumPortion(const OUString &rExp, const OUString& rStr)
+SwErgoSumPortion::SwErgoSumPortion(const OUString &rExp, std::u16string_view rStr)
     : SwFieldPortion( rExp )
 {
     SetLen(TextFrameIndex(0));
diff --git a/sw/source/uibase/shells/grfsh.cxx b/sw/source/uibase/shells/grfsh.cxx
index d4197cba5c85..0ed3e1daa146 100644
--- a/sw/source/uibase/shells/grfsh.cxx
+++ b/sw/source/uibase/shells/grfsh.cxx
@@ -64,7 +64,7 @@
 #include <unocrsr.hxx>
 #include <memory>
 
-#define TOOLBOX_NAME "colorbar"
+#define TOOLBOX_NAME u"colorbar"
 
 class SwGrfShell::SwExternalToolEdit
     : public ExternalToolEdit
diff --git a/ucb/source/ucp/tdoc/tdoc_datasupplier.cxx b/ucb/source/ucp/tdoc/tdoc_datasupplier.cxx
index 33c4f11cbfa9..332da1096a2e 100644
--- a/ucb/source/ucp/tdoc/tdoc_datasupplier.cxx
+++ b/ucb/source/ucp/tdoc/tdoc_datasupplier.cxx
@@ -391,7 +391,7 @@ bool ResultSetDataSupplier::queryNamesOfChildren()
 }
 
 OUString
-ResultSetDataSupplier::assembleChildURL( const OUString& aName )
+ResultSetDataSupplier::assembleChildURL( std::u16string_view aName )
 {
     OUString aContURL
         = m_pImpl->m_xContent->getIdentifier()->getContentIdentifier();
diff --git a/ucb/source/ucp/tdoc/tdoc_datasupplier.hxx b/ucb/source/ucp/tdoc/tdoc_datasupplier.hxx
index cf888c0d6a0a..0f7cbffeb1c3 100644
--- a/ucb/source/ucp/tdoc/tdoc_datasupplier.hxx
+++ b/ucb/source/ucp/tdoc/tdoc_datasupplier.hxx
@@ -23,6 +23,7 @@
 #include <rtl/ref.hxx>
 #include <ucbhelper/resultset.hxx>
 #include <memory>
+#include <string_view>
 
 namespace tdoc_ucp {
 
@@ -35,7 +36,7 @@ class ResultSetDataSupplier : public ::ucbhelper::ResultSetDataSupplier
 
 private:
     bool queryNamesOfChildren();
-    OUString assembleChildURL( const OUString& aName );
+    OUString assembleChildURL( std::u16string_view aName );
 
 public:
     ResultSetDataSupplier(
diff --git a/ucb/source/ucp/webdav-neon/NeonUri.cxx b/ucb/source/ucp/webdav-neon/NeonUri.cxx
index f3f142123a40..4c88819e7bb5 100644
--- a/ucb/source/ucp/webdav-neon/NeonUri.cxx
+++ b/ucb/source/ucp/webdav-neon/NeonUri.cxx
@@ -235,7 +235,7 @@ OUString NeonUri::GetPathBaseNameUnescaped () const
     return unescape( GetPathBaseName() );
 }
 
-void NeonUri::AppendPath (const OUString& rPath)
+void NeonUri::AppendPath (std::u16string_view rPath)
 {
     if (mPath.lastIndexOf ('/') != mPath.getLength () - 1)
         mPath += "/";
diff --git a/ucb/source/ucp/webdav-neon/NeonUri.hxx b/ucb/source/ucp/webdav-neon/NeonUri.hxx
index fae505e501f5..3149ab9fb53f 100644
--- a/ucb/source/ucp/webdav-neon/NeonUri.hxx
+++ b/ucb/source/ucp/webdav-neon/NeonUri.hxx
@@ -28,6 +28,10 @@
 #ifndef INCLUDED_UCB_SOURCE_UCP_WEBDAV_NEON_NEONURI_HXX
 #define INCLUDED_UCB_SOURCE_UCP_WEBDAV_NEON_NEONURI_HXX
 
+#include <sal/config.h>
+
+#include <string_view>
+
 #include <config_lgpl.h>
 #include <ne_uri.h>
 #include <rtl/ustring.hxx>
@@ -84,7 +88,7 @@ class NeonUri
         void SetScheme (const OUString& scheme)
             { mScheme = scheme; calculateURI (); };
 
-        void AppendPath (const OUString& rPath);
+        void AppendPath (std::u16string_view rPath);
 
         static OUString escapeSegment( const OUString& segment );
         static OUString unescape( const OUString& string );
diff --git a/unotools/source/i18n/resmgr.cxx b/unotools/source/i18n/resmgr.cxx
index ef5b83cf06bc..caee3ecf1818 100644
--- a/unotools/source/i18n/resmgr.cxx
+++ b/unotools/source/i18n/resmgr.cxx
@@ -119,7 +119,7 @@ namespace Translate
     std::locale Create(const char* pPrefixName, const LanguageTag& rLocale)
     {
         static std::unordered_map<OString, std::locale> aCache;
-        OString sIdentifier = rLocale.getGlibcLocaleString(".UTF-8").toUtf8();
+        OString sIdentifier = rLocale.getGlibcLocaleString(u".UTF-8").toUtf8();
         OString sUnique = sIdentifier + pPrefixName;
         auto aFind = aCache.find(sUnique);
         if (aFind != aCache.end())
diff --git a/unotools/source/misc/fontdefs.cxx b/unotools/source/misc/fontdefs.cxx
index 59830cb1e1b0..e470575a015b 100644
--- a/unotools/source/misc/fontdefs.cxx
+++ b/unotools/source/misc/fontdefs.cxx
@@ -20,6 +20,8 @@
 #include <unotools/fontdefs.hxx>
 #include <unotools/fontcfg.hxx>
 #include <rtl/ustrbuf.hxx>
+
+#include <string_view>
 #include <unordered_map>
 
 sal_Unicode const aBatang[] = { 0xBC14, 0xD0D5, 0 };
@@ -489,7 +491,7 @@ static bool ImplIsFontToken( const OUString& rName, std::u16string_view rToken )
     return false;
 }
 
-static void ImplAppendFontToken( OUString& rName, const OUString& rNewToken )
+static void ImplAppendFontToken( OUString& rName, std::u16string_view rNewToken )
 {
     if ( !rName.isEmpty() )
     {
@@ -498,7 +500,7 @@ static void ImplAppendFontToken( OUString& rName, const OUString& rNewToken )
     rName += rNewToken;
 }
 
-void AddTokenFontName( OUString& rName, const OUString& rNewToken )
+void AddTokenFontName( OUString& rName, std::u16string_view rNewToken )
 {
     if ( !ImplIsFontToken( rName, rNewToken ) )
         ImplAppendFontToken( rName, rNewToken );
diff --git a/vcl/source/app/svmain.cxx b/vcl/source/app/svmain.cxx
index 4c9fbbe06f48..eaba51522b76 100644
--- a/vcl/source/app/svmain.cxx
+++ b/vcl/source/app/svmain.cxx
@@ -333,7 +333,7 @@ bool InitVCL()
         //force that in as $LANGUAGE. That way we can get gtk to render widgets RTL
         //if we have a RTL UI in an otherwise LTR locale and get gettext using externals (e.g. python)
         //to match their translations to our preferred UI language
-        OUString aLocaleString(SvtSysLocaleOptions().GetRealUILanguageTag().getGlibcLocaleString(".UTF-8"));
+        OUString aLocaleString(SvtSysLocaleOptions().GetRealUILanguageTag().getGlibcLocaleString(u".UTF-8"));
         if (!aLocaleString.isEmpty())
         {
             MsLangId::getSystemUILanguage(); //call this now to pin what the system UI really was
diff --git a/vcl/source/filter/graphicfilter.cxx b/vcl/source/filter/graphicfilter.cxx
index 503776986f70..5dc3d8b0f10c 100644
--- a/vcl/source/filter/graphicfilter.cxx
+++ b/vcl/source/filter/graphicfilter.cxx
@@ -585,7 +585,7 @@ static Graphic ImpGetScaledGraphic( const Graphic& rGraphic, FilterConfigItem& r
     return aGraphic;
 }
 
-static OUString ImpCreateFullFilterPath( const OUString& rPath, const OUString& rFilterName )
+static OUString ImpCreateFullFilterPath( const OUString& rPath, std::u16string_view rFilterName )
 {
     OUString aPathURL;
 
diff --git a/vcl/unx/generic/app/wmadaptor.cxx b/vcl/unx/generic/app/wmadaptor.cxx
index ec853e26accc..9a6142314328 100644
--- a/vcl/unx/generic/app/wmadaptor.cxx
+++ b/vcl/unx/generic/app/wmadaptor.cxx
@@ -19,6 +19,7 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include <string_view>
 
 #include <i18nlangtag/languagetag.hxx>
 #include <rtl/locale.h>
@@ -973,7 +974,8 @@ void WMAdaptor::setWMName( X11SalFrame* pFrame, const OUString& rWMName ) const
     osl_getProcessLocale( &pLocale );
     if( pLocale )
     {
-        OUString aLocaleString( LanguageTag( *pLocale).getGlibcLocaleString( OUString()));
+        OUString aLocaleString(
+            LanguageTag( *pLocale).getGlibcLocaleString( std::u16string_view()));
         aWMLocale = OUStringToOString( aLocaleString, RTL_TEXTENCODING_ISO_8859_1 );
     }
     else
diff --git a/writerfilter/source/dmapper/DomainMapper_Impl.cxx b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
index dfd398cbda37..59f856801c05 100644
--- a/writerfilter/source/dmapper/DomainMapper_Impl.cxx
+++ b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
@@ -3999,7 +3999,7 @@ void FieldContext::SetTextField(uno::Reference<text::XTextField> const& xTextFie
     m_xTextField = xTextField;
 }
 
-void FieldContext::AppendCommand(const OUString& rPart)
+void FieldContext::AppendCommand(std::u16string_view rPart)
 {
     m_sCommand += rPart;
 }
@@ -6067,7 +6067,7 @@ bool DomainMapper_Impl::IsFieldResultAsString()
     return bRet;
 }
 
-void DomainMapper_Impl::AppendFieldResult(OUString const& rString)
+void DomainMapper_Impl::AppendFieldResult(std::u16string_view rString)
 {
     assert(!m_aFieldStack.empty());
     FieldContextPtr pContext = m_aFieldStack.back();
diff --git a/writerfilter/source/dmapper/DomainMapper_Impl.hxx b/writerfilter/source/dmapper/DomainMapper_Impl.hxx
index 0a2b5cbd5e85..b4b111e787ec 100644
--- a/writerfilter/source/dmapper/DomainMapper_Impl.hxx
+++ b/writerfilter/source/dmapper/DomainMapper_Impl.hxx
@@ -27,6 +27,7 @@
 #include <com/sun/star/embed/XStorage.hpp>
 #include <queue>
 #include <stack>
+#include <string_view>
 #include <o3tl/sorted_vector.hxx>
 #include <unordered_map>
 #include <vector>
@@ -182,13 +183,13 @@ public:
 
     const css::uno::Reference<css::text::XTextRange>& GetStartRange() const { return m_xStartRange; }
 
-    void                    AppendCommand(const OUString& rPart);
+    void                    AppendCommand(std::u16string_view rPart);
     const OUString&  GetCommand() const {return m_sCommand; }
 
     void SetFieldId(FieldId eFieldId ) { m_eFieldId = eFieldId; }
     std::optional<FieldId> const & GetFieldId() const { return m_eFieldId; }
 
-    void AppendResult(OUString const& rResult) { m_sResult += rResult; }
+    void AppendResult(std::u16string_view rResult) { m_sResult += rResult; }
     const OUString&  GetResult() const { return m_sResult; }
 
     void                    SetCommandCompleted() { m_bFieldCommandCompleted = true; }
@@ -854,7 +855,7 @@ public:
     void CloseFieldCommand();
     //the _current_ fields require a string type result while TOCs accept richt results
     bool IsFieldResultAsString();
-    void AppendFieldResult(OUString const& rResult);
+    void AppendFieldResult(std::u16string_view rResult);
     //apply the result text to the related field
     void SetFieldResult(OUString const& rResult);
     // set FFData of top field context
diff --git a/xmloff/source/text/txtparai.cxx b/xmloff/source/text/txtparai.cxx
index fb480dd136e0..c74fbeb0fcd7 100644
--- a/xmloff/source/text/txtparai.cxx
+++ b/xmloff/source/text/txtparai.cxx
@@ -20,6 +20,7 @@
 #include <xmloff/unointerfacetouniqueidentifiermapper.hxx>
 
 #include <memory>
+#include <string_view>
 #include <vector>
 
 #include <rtl/ustring.hxx>
@@ -524,7 +525,7 @@ public:
         sal_Int32 nElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& AttrList ) override;
 
     void SetTextStyleName( const OUString& s ) { m_sTextStyleName = s; }
-    void AppendText( const OUString& s ) { m_sText += s; }
+    void AppendText( std::u16string_view s ) { m_sText += s; }
 };
 
 class XMLImpRubyTextContext_Impl : public SvXMLImportContext