Get rid of aEmptyOUStr

Commit 8051bb7e18ccae0f639e65dfa86bcc18a5fb9108 had removed its "String"
counterpart.

Change-Id: Id873a259e7f4b2794e94dec83d08ed6b57298beb
Reviewed-on: https://gerrit.libreoffice.org/65299
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

15 files changed, 47 insertions, 45 deletions

diff --git a/sw/source/filter/html/css1atr.cxx b/sw/source/filter/html/css1atr.cxx
index 7dc44e6d23f0..331f0014c718 100644
--- a/sw/source/filter/html/css1atr.cxx
+++ b/sw/source/filter/html/css1atr.cxx
@@ -1091,7 +1091,7 @@ void SwHTMLWriter::PrepareFontList( const SvxFontItem& rFontItem,
                                     OUString& rNames,
                                     sal_Unicode cQuote, bool bGeneric )
 {
-    rNames = aEmptyOUStr;
+    rNames.clear();
     const OUString& rName = rFontItem.GetFamilyName();
     bool bContainsKeyword = false;
     if( !rName.isEmpty() )
diff --git a/sw/source/filter/html/htmlbas.cxx b/sw/source/filter/html/htmlbas.cxx
index 158884433ab1..47e26cbcb7fd 100644
--- a/sw/source/filter/html/htmlbas.cxx
+++ b/sw/source/filter/html/htmlbas.cxx
@@ -292,7 +292,7 @@ void SwHTMLWriter::OutBasic()
             const OUString& rModName = pModule->GetName();
             Strm().WriteCharPtr( SAL_NEWLINE_STRING );   // don't indent!
             HTMLOutFuncs::OutScript( Strm(), GetBaseURL(), pModule->GetSource(),
-                                     sLang, STARBASIC, aEmptyOUStr,
+                                     sLang, STARBASIC, OUString(),
                                      &rLibName, &rModName,
                                      m_eDestEnc, &m_aNonConvertableCharacters );
         }
diff --git a/sw/source/filter/html/htmlcss1.cxx b/sw/source/filter/html/htmlcss1.cxx
index cd94832ce815..1c885c108132 100644
--- a/sw/source/filter/html/htmlcss1.cxx
+++ b/sw/source/filter/html/htmlcss1.cxx
@@ -353,7 +353,7 @@ void SwCSS1Parser::SetTableTextColl( bool bHeader )
     SvxCSS1MapEntry *pStyleEntry = GetTag( sTag );
     if( pStyleEntry )
     {
-        pColl = GetTextFormatColl( nPoolId, aEmptyOUStr );
+        pColl = GetTextFormatColl(nPoolId, OUString());
         SetTextCollAttrs( pColl, pStyleEntry->GetItemSet(),
                          pStyleEntry->GetPropertyInfo(), this );
     }
@@ -363,7 +363,7 @@ void SwCSS1Parser::SetTableTextColl( bool bHeader )
     if( pStyleEntry )
     {
         if( !pColl )
-            pColl = GetTextFormatColl( nPoolId, aEmptyOUStr );
+            pColl = GetTextFormatColl(nPoolId, OUString());
         SetTextCollAttrs( pColl, pStyleEntry->GetItemSet(),
                          pStyleEntry->GetPropertyInfo(), this );
     }
@@ -893,7 +893,7 @@ void SwCSS1Parser::StyleParsed( const CSS1Selector *pSelector,
                 nPoolCollId = RES_POOLCOLL_FOOTNOTE;
 
             if( nPoolCollId )
-                aClass = aEmptyOUStr;
+                aClass.clear();
             else
                 nPoolCollId = RES_POOLCOLL_TEXT;
         }
@@ -978,7 +978,7 @@ void SwCSS1Parser::StyleParsed( const CSS1Selector *pSelector,
             // either not a composed selector or a X:first-line { float: left; ... }
 
             // search resp. create the style
-            SwTextFormatColl *pColl = GetTextFormatColl( nPoolCollId, aEmptyOUStr );
+            SwTextFormatColl* pColl = GetTextFormatColl(nPoolCollId, OUString());
             SwTextFormatColl* pParentColl = nullptr;
             if( !aClass.isEmpty() )
             {
@@ -1072,7 +1072,7 @@ void SwCSS1Parser::StyleParsed( const CSS1Selector *pSelector,
     if( pNext )
         return;
 
-    SwCharFormat *pCFormat = GetChrFormat( nToken2, aEmptyOUStr );
+    SwCharFormat* pCFormat = GetChrFormat(nToken2, OUString());
     if( pCFormat )
     {
         SwCharFormat *pParentCFormat = nullptr;
@@ -1252,12 +1252,12 @@ SwTextFormatColl *SwCSS1Parser::GetTextFormatColl( sal_uInt16 nTextColl,
         if( aClass.equalsIgnoreAsciiCase(OOO_STRING_SVTOOLS_HTML_sdendnote) )
         {
             nTextColl = RES_POOLCOLL_ENDNOTE;
-            aClass = aEmptyOUStr;
+            aClass.clear();
         }
         else if( aClass.equalsIgnoreAsciiCase(OOO_STRING_SVTOOLS_HTML_sdfootnote) )
         {
             nTextColl = RES_POOLCOLL_FOOTNOTE;
-            aClass = aEmptyOUStr;
+            aClass.clear();
         }
     }
 
@@ -1798,7 +1798,7 @@ bool SwCSS1Parser::ParseStyleSheet( const OUString& rIn )
     SwPageDesc *pMasterPageDesc =
         m_pDoc->getIDocumentStylePoolAccess().GetPageDescFromPool( RES_POOLPAGE_HTML, false );
 
-    SvxCSS1MapEntry *pPageEntry = GetPage( aEmptyOUStr, false );
+    SvxCSS1MapEntry* pPageEntry = GetPage(OUString(), false);
     if( pPageEntry )
     {
         // @page (affects all already existing pages)
diff --git a/sw/source/filter/html/htmldrawreader.cxx b/sw/source/filter/html/htmldrawreader.cxx
index 9843075560ea..0b1bde84b298 100644
--- a/sw/source/filter/html/htmldrawreader.cxx
+++ b/sw/source/filter/html/htmldrawreader.cxx
@@ -231,7 +231,7 @@ static void PutEEPoolItem( SfxItemSet &rEEItemSet,
         {
             const SvxBrushItem& rBrushItem = static_cast<const SvxBrushItem&>(rSwItem);
             rEEItemSet.Put( XFillStyleItem(drawing::FillStyle_SOLID) );
-            rEEItemSet.Put( XFillColorItem(aEmptyOUStr,
+            rEEItemSet.Put(XFillColorItem(OUString(),
                             rBrushItem.GetColor()) );
         }
         break;
@@ -438,7 +438,7 @@ void SwHTMLParser::NewMarquee( HTMLTable *pCurTable )
     if( bBGColor )
     {
         aItemSet.Put( XFillStyleItem(drawing::FillStyle_SOLID) );
-        aItemSet.Put( XFillColorItem(aEmptyOUStr, aBGColor) );
+        aItemSet.Put(XFillColorItem(OUString(), aBGColor));
     }
 
     // parse styles (is here only possible for attributes, which also
diff --git a/sw/source/filter/html/htmldrawwriter.cxx b/sw/source/filter/html/htmldrawwriter.cxx
index b6f071c869c4..9b4f06e029e5 100644
--- a/sw/source/filter/html/htmldrawwriter.cxx
+++ b/sw/source/filter/html/htmldrawwriter.cxx
@@ -273,7 +273,7 @@ Writer& OutHTML_DrawFrameFormatAsMarquee( Writer& rWrt,
     HtmlFrmOpts nFrameFlags = HTML_FRMOPTS_MARQUEE;
     if( rHTMLWrt.IsHTMLMode( HTMLMODE_ABS_POS_DRAW ) )
         nFrameFlags |= HTML_FRMOPTS_MARQUEE_CSS1;
-    OString aEndTags = rHTMLWrt.OutFrameFormatOptions( rFormat, aEmptyOUStr, nFrameFlags );
+    OString aEndTags = rHTMLWrt.OutFrameFormatOptions(rFormat, OUString(), nFrameFlags);
     if( rHTMLWrt.IsHTMLMode( HTMLMODE_ABS_POS_DRAW ) )
         rHTMLWrt.OutCSS1_FrameFormatOptions( rFormat, nFrameFlags, &rSdrObject );
 
diff --git a/sw/source/filter/html/htmlfld.cxx b/sw/source/filter/html/htmlfld.cxx
index da9211de08dc..db7edb38a868 100644
--- a/sw/source/filter/html/htmlfld.cxx
+++ b/sw/source/filter/html/htmlfld.cxx
@@ -636,7 +636,7 @@ void SwHTMLParser::InsertComment( const OUString& rComment, const sal_Char *pTag
 
     SwPostItField aPostItField(
                     static_cast<SwPostItFieldType*>(m_xDoc->getIDocumentFieldsAccess().GetSysFieldType( SwFieldIds::Postit )),
-                    aEmptyOUStr, aComment, aEmptyOUStr, aEmptyOUStr, DateTime( DateTime::SYSTEM ) );
+                    OUString(), aComment, OUString(), OUString(), DateTime(DateTime::SYSTEM));
     InsertAttr( SwFormatField( aPostItField ), false );
 
     if( bMoveFwd )
diff --git a/sw/source/filter/html/htmlflywriter.cxx b/sw/source/filter/html/htmlflywriter.cxx
index 3d74a9e7976e..589aa2510cc1 100644
--- a/sw/source/filter/html/htmlflywriter.cxx
+++ b/sw/source/filter/html/htmlflywriter.cxx
@@ -1614,7 +1614,7 @@ static Writer & OutHTML_FrameFormatAsMulticol( Writer& rWrt,
     HtmlFrmOpts nFrameFlags = HTML_FRMOPTS_MULTICOL;
     if( rHTMLWrt.IsHTMLMode( HTMLMODE_ABS_POS_FLY ) && !bInCntnr )
         nFrameFlags |= HTML_FRMOPTS_MULTICOL_CSS1;
-    rHTMLWrt.OutFrameFormatOptions( rFrameFormat, aEmptyOUStr, nFrameFlags );
+    rHTMLWrt.OutFrameFormatOptions(rFrameFormat, OUString(), nFrameFlags);
     if( rHTMLWrt.IsHTMLMode( HTMLMODE_ABS_POS_FLY ) && !bInCntnr )
         rHTMLWrt.OutCSS1_FrameFormatOptions( rFrameFormat, nFrameFlags );
 
@@ -1662,7 +1662,7 @@ static Writer& OutHTML_FrameFormatAsSpacer( Writer& rWrt, const SwFrameFormat& r
     rWrt.Strm().WriteCharPtr( sOut.makeStringAndClear().getStr() );
 
     // ALIGN, WIDTH, HEIGHT
-    OString aEndTags = rHTMLWrt.OutFrameFormatOptions( rFrameFormat, aEmptyOUStr, HTML_FRMOPTS_SPACER );
+    OString aEndTags = rHTMLWrt.OutFrameFormatOptions(rFrameFormat, OUString(), HTML_FRMOPTS_SPACER);
 
     rWrt.Strm().WriteChar( '>' );
     if( !aEndTags.isEmpty() )
@@ -1699,7 +1699,7 @@ static Writer& OutHTML_FrameFormatAsDivOrSpan( Writer& rWrt,
     HtmlFrmOpts nFrameFlags = HTML_FRMOPTS_DIV;
     if( rHTMLWrt.IsHTMLMode( HTMLMODE_BORDER_NONE ) )
        nFrameFlags |= HtmlFrmOpts::SNoBorder;
-    OString aEndTags = rHTMLWrt.OutFrameFormatOptions( rFrameFormat, aEmptyOUStr, nFrameFlags );
+    OString aEndTags = rHTMLWrt.OutFrameFormatOptions(rFrameFormat, OUString(), nFrameFlags);
     rHTMLWrt.OutCSS1_FrameFormatOptions( rFrameFormat, nFrameFlags );
     rWrt.Strm().WriteChar( '>' );
 
diff --git a/sw/source/filter/html/htmlform.cxx b/sw/source/filter/html/htmlform.cxx
index 08989acfa370..c4bd7f94afaf 100644
--- a/sw/source/filter/html/htmlform.cxx
+++ b/sw/source/filter/html/htmlform.cxx
@@ -243,7 +243,7 @@ public:
     void SetShape( const uno::Reference< drawing::XShape >& r ) { m_xShape = r; }
 
     OUString& GetText() { return m_sText; }
-    void EraseText() { m_sText = aEmptyOUStr; }
+    void EraseText() { m_sText.clear(); }
 
     std::vector<OUString>& GetStringList() { return m_aStringList; }
     void EraseStringList()
@@ -2449,7 +2449,7 @@ void SwHTMLParser::InsertSelectOption()
     }
 
     sal_uInt16 nEntryCnt = m_pFormImpl->GetStringList().size();
-    m_pFormImpl->GetStringList().push_back(aEmptyOUStr);
+    m_pFormImpl->GetStringList().push_back(OUString());
     m_pFormImpl->GetValueList().push_back(aValue);
     if( m_bLBEntrySelected )
     {
diff --git a/sw/source/filter/html/htmlforw.cxx b/sw/source/filter/html/htmlforw.cxx
index b3f2d6088c00..573663220d3a 100644
--- a/sw/source/filter/html/htmlforw.cxx
+++ b/sw/source/filter/html/htmlforw.cxx
@@ -1045,7 +1045,7 @@ Writer& OutHTML_DrawFrameFormatAsControl( Writer& rWrt,
     }
     OString aEndTags;
     if( nFrameOpts != HtmlFrmOpts::NONE )
-        aEndTags = rHTMLWrt.OutFrameFormatOptions( rFormat, aEmptyOUStr, nFrameOpts );
+        aEndTags = rHTMLWrt.OutFrameFormatOptions(rFormat, OUString(), nFrameOpts);
 
     if( rHTMLWrt.m_bCfgOutStyles )
     {
@@ -1101,7 +1101,7 @@ Writer& OutHTML_DrawFrameFormatAsControl( Writer& rWrt,
                             if( auto n = o3tl::tryAccess<sal_Int16>(aTmp2) )
                                 eFamily = static_cast<FontFamily>(*n);
                         }
-                        SvxFontItem aItem( eFamily, *aFName, aEmptyOUStr, PITCH_DONTKNOW, RTL_TEXTENCODING_DONTKNOW, RES_CHRATR_FONT );
+                        SvxFontItem aItem(eFamily, *aFName, OUString(), PITCH_DONTKNOW, RTL_TEXTENCODING_DONTKNOW, RES_CHRATR_FONT);
                         aItemSet.Put( aItem );
                     }
                 }
diff --git a/sw/source/filter/html/htmlftn.cxx b/sw/source/filter/html/htmlftn.cxx
index cfab31225bc6..f7c35ed61272 100644
--- a/sw/source/filter/html/htmlftn.cxx
+++ b/sw/source/filter/html/htmlftn.cxx
@@ -35,7 +35,7 @@
 static sal_Int32 lcl_html_getNextPart( OUString& rPart, const OUString& rContent,
                              sal_Int32 nPos )
 {
-    rPart = aEmptyOUStr;
+    rPart.clear();
     sal_Int32 nLen = rContent.getLength();
     if( nPos >= nLen )
     {
@@ -182,7 +182,7 @@ void SwHTMLParser::InsertFootEndNote( const OUString& rName, bool bEndNote,
     m_pFootEndNoteImpl->sName = m_pFootEndNoteImpl->sName.toAsciiUpperCase();
     m_pFootEndNoteImpl->bEndNote = bEndNote;
     m_pFootEndNoteImpl->bFixed = bFixed;
-    m_pFootEndNoteImpl->sContent = aEmptyOUStr;
+    m_pFootEndNoteImpl->sContent.clear();
 }
 
 void SwHTMLParser::FinishFootEndNote()
@@ -201,8 +201,8 @@ void SwHTMLParser::FinishFootEndNote()
     // In header and footer no footnotes can be inserted.
     if (pTextFootnote)
         m_pFootEndNoteImpl->aTextFootnotes.push_back(SwHTMLTextFootnote(m_pFootEndNoteImpl->sName,pTextFootnote));
-    m_pFootEndNoteImpl->sName = aEmptyOUStr;
-    m_pFootEndNoteImpl->sContent = aEmptyOUStr;
+    m_pFootEndNoteImpl->sName.clear();
+    m_pFootEndNoteImpl->sContent.clear();
     m_pFootEndNoteImpl->bFixed = false;
 }
 
diff --git a/sw/source/filter/html/htmlgrin.cxx b/sw/source/filter/html/htmlgrin.cxx
index 04ad57da0013..ba1d99f99456 100644
--- a/sw/source/filter/html/htmlgrin.cxx
+++ b/sw/source/filter/html/htmlgrin.cxx
@@ -788,7 +788,7 @@ IMAGE_SETEVENT:
     // passing empty sGrfNm here, means we don't want the graphic to be linked
     SwFrameFormat *const pFlyFormat =
         m_xDoc->getIDocumentContentOperations().InsertGraphic(
-            *m_pPam, sGrfNm, aEmptyOUStr, &aGraphic,
+            *m_pPam, sGrfNm, OUString(), &aGraphic,
             &aFrameSet, nullptr, nullptr);
     SwGrfNode *pGrfNd = m_xDoc->GetNodes()[ pFlyFormat->GetContent().GetContentIdx()
                                   ->GetIndex()+1 ]->GetGrfNode();
@@ -1264,7 +1264,9 @@ ANCHOR_SETEVENT:
         if( bEnAnchor || bFootnoteAnchor || bFootnoteEnSymbol )
         {
             aFootnoteName = sHRef.copy( 1 );
-            aClass = aStrippedClass = aName = aEmptyOUStr;
+            aClass.clear();
+            aStrippedClass.clear();
+            aName.clear();
             bHasHRef = false;
         }
     }
diff --git a/sw/source/filter/html/htmlsect.cxx b/sw/source/filter/html/htmlsect.cxx
index f33b7d1bf75c..8ebd982fd635 100644
--- a/sw/source/filter/html/htmlsect.cxx
+++ b/sw/source/filter/html/htmlsect.cxx
@@ -642,7 +642,7 @@ void SwHTMLParser::NewMultiCol( sal_uInt16 columnsFromCss )
 
         // Insert fly frame. If the are columns, the fly frame's name is not
         // the sections name but a generated one.
-        OUString aFlyName( aEmptyOUStr );
+        OUString aFlyName;
         if( nCols < 2 )
         {
             aFlyName = aId;
diff --git a/sw/source/filter/html/htmltab.cxx b/sw/source/filter/html/htmltab.cxx
index 28f1e5d3cac1..384932beb194 100644
--- a/sw/source/filter/html/htmltab.cxx
+++ b/sw/source/filter/html/htmltab.cxx
@@ -1007,7 +1007,7 @@ void HTMLTable::InitCtor(const HTMLTableOptions& rOptions)
 
     m_xBackgroundBrush.reset(m_pParser->CreateBrushItem(
                     rOptions.bBGColor ? &(rOptions.aBGColor) : nullptr,
-                    rOptions.aBGImage, aEmptyOUStr, aEmptyOUStr, aEmptyOUStr));
+                    rOptions.aBGImage, OUString(), OUString(), OUString()));
 
     m_pContext = nullptr;
     m_xParentContents.reset();
@@ -2998,7 +2998,7 @@ CellSaveStruct::CellSaveStruct( SwHTMLParser& rParser, HTMLTable const *pCurTabl
         nToken = HtmlTokenId::TABLEDATA_ON;
         nColl = RES_POOLCOLL_TABLE;
     }
-    std::unique_ptr<HTMLAttrContext> xCntxt(new HTMLAttrContext(nToken, nColl, aEmptyOUStr, true));
+    std::unique_ptr<HTMLAttrContext> xCntxt(new HTMLAttrContext(nToken, nColl, OUString(), true));
     if( SvxAdjust::End != eAdjust )
         rParser.InsertAttr(&rParser.m_xAttrTab->pAdjust, SvxAdjustItem(eAdjust, RES_PARATR_ADJUST),
                            xCntxt.get());
diff --git a/sw/source/filter/html/swhtml.cxx b/sw/source/filter/html/swhtml.cxx
index 4d7905a203f3..aa453421f05b 100644
--- a/sw/source/filter/html/swhtml.cxx
+++ b/sw/source/filter/html/swhtml.cxx
@@ -3923,12 +3923,12 @@ void SwHTMLParser::NewPara()
 
     // parse styles (Don't consider class. This is only possible as long as none of
     // the CSS1 properties of the class must be formatted hard!!!)
-    if( HasStyleOptions( aStyle, aId, aEmptyOUStr, &aLang, &aDir ) )
+    if (HasStyleOptions(aStyle, aId, OUString(), &aLang, &aDir))
     {
         SfxItemSet aItemSet( m_xDoc->GetAttrPool(), m_pCSS1Parser->GetWhichMap() );
         SvxCSS1PropertyInfo aPropInfo;
 
-        if( ParseStyleOptions( aStyle, aId, aEmptyOUStr, aItemSet, aPropInfo, &aLang, &aDir ) )
+        if (ParseStyleOptions(aStyle, aId, OUString(), aItemSet, aPropInfo, &aLang, &aDir))
         {
             OSL_ENSURE( aClass.isEmpty() || !m_pCSS1Parser->GetClass( aClass ),
                     "Class is not considered" );
@@ -4057,12 +4057,12 @@ void SwHTMLParser::NewHeading( HtmlTokenId nToken )
     std::unique_ptr<HTMLAttrContext> xCntxt(new HTMLAttrContext(nToken, nTextColl, aClass));
 
     // parse styles (regarding class see also NewPara)
-    if( HasStyleOptions( aStyle, aId, aEmptyOUStr, &aLang, &aDir ) )
+    if (HasStyleOptions(aStyle, aId, OUString(), &aLang, &aDir))
     {
         SfxItemSet aItemSet( m_xDoc->GetAttrPool(), m_pCSS1Parser->GetWhichMap() );
         SvxCSS1PropertyInfo aPropInfo;
 
-        if( ParseStyleOptions( aStyle, aId, aEmptyOUStr, aItemSet, aPropInfo, &aLang, &aDir ) )
+        if (ParseStyleOptions(aStyle, aId, OUString(), aItemSet, aPropInfo, &aLang, &aDir))
         {
             OSL_ENSURE( aClass.isEmpty() || !m_pCSS1Parser->GetClass( aClass ),
                     "Class is not considered" );
@@ -4166,7 +4166,7 @@ void SwHTMLParser::NewTextFormatColl( HtmlTokenId nToken, sal_uInt16 nColl )
         // These both tags will be mapped to the PRE style. For the case that a
         // a CLASS exists we will delete it so that we don't get the CLASS of
         // the PRE style.
-        aClass = aEmptyOUStr;
+        aClass.clear();
         [[fallthrough]];
     case HtmlTokenId::BLOCKQUOTE_ON:
     case HtmlTokenId::BLOCKQUOTE30_ON:
@@ -4193,12 +4193,12 @@ void SwHTMLParser::NewTextFormatColl( HtmlTokenId nToken, sal_uInt16 nColl )
     std::unique_ptr<HTMLAttrContext> xCntxt(new HTMLAttrContext(nToken, nColl, aClass));
 
     // parse styles (regarding class see also NewPara)
-    if( HasStyleOptions( aStyle, aId, aEmptyOUStr, &aLang, &aDir ) )
+    if (HasStyleOptions(aStyle, aId, OUString(), &aLang, &aDir))
     {
         SfxItemSet aItemSet( m_xDoc->GetAttrPool(), m_pCSS1Parser->GetWhichMap() );
         SvxCSS1PropertyInfo aPropInfo;
 
-        if( ParseStyleOptions( aStyle, aId, aEmptyOUStr, aItemSet, aPropInfo, &aLang, &aDir ) )
+        if (ParseStyleOptions(aStyle, aId, OUString(), aItemSet, aPropInfo, &aLang, &aDir))
         {
             OSL_ENSURE( aClass.isEmpty() || !m_pCSS1Parser->GetClass( aClass ),
                     "Class is not considered" );
@@ -4333,7 +4333,7 @@ void SwHTMLParser::NewDefList()
 
         // and the one of the DT-style of the current level
         SvxLRSpaceItem rLRSpace =
-            m_pCSS1Parser->GetTextFormatColl( RES_POOLCOLL_HTML_DD, aEmptyOUStr )
+            m_pCSS1Parser->GetTextFormatColl(RES_POOLCOLL_HTML_DD, OUString())
                        ->GetLRSpace();
         nLeft = nLeft + static_cast< sal_uInt16 >(rLRSpace.GetTextLeft());
     }
@@ -4553,7 +4553,7 @@ void SwHTMLParser::SetTextCollAttrs( HTMLAttrContext *pContext )
     SwTextFormatColl *pCollToSet = nullptr; // the style to set
     SfxItemSet *pItemSet = nullptr;         // set of hard attributes
     sal_uInt16 nTopColl = pContext ? pContext->GetTextFormatColl() : 0;
-    const OUString& rTopClass = pContext ? pContext->GetClass() : aEmptyOUStr;
+    const OUString rTopClass = pContext ? pContext->GetClass() : OUString();
     sal_uInt16 nDfltColl = RES_POOLCOLL_TEXT;
 
     bool bInPRE=false;                          // some context info
@@ -4681,7 +4681,7 @@ void SwHTMLParser::SetTextCollAttrs( HTMLAttrContext *pContext )
             if( RES_POOLCOLL_HTML_DD == nTopColl )
             {
                 const SvxLRSpaceItem& rDTLRSpace = m_pCSS1Parser
-                    ->GetTextFormatColl( RES_POOLCOLL_HTML_DT, aEmptyOUStr )
+                    ->GetTextFormatColl(RES_POOLCOLL_HTML_DT, OUString())
                     ->GetLRSpace();
                 nLeft -= rDTLRSpace.GetTextLeft();
                 nRight -= rDTLRSpace.GetRight();
@@ -4799,12 +4799,12 @@ void SwHTMLParser::NewCharFormat( HtmlTokenId nToken )
     OSL_ENSURE( pCFormat, "No character format found for token" );
 
     // parse styles (regarding class see also NewPara)
-    if( HasStyleOptions( aStyle, aId, aEmptyOUStr, &aLang, &aDir ) )
+    if (HasStyleOptions(aStyle, aId, OUString(), &aLang, &aDir))
     {
         SfxItemSet aItemSet( m_xDoc->GetAttrPool(), m_pCSS1Parser->GetWhichMap() );
         SvxCSS1PropertyInfo aPropInfo;
 
-        if( ParseStyleOptions( aStyle, aId, aEmptyOUStr, aItemSet, aPropInfo, &aLang, &aDir ) )
+        if (ParseStyleOptions(aStyle, aId, OUString(), aItemSet, aPropInfo, &aLang, &aDir))
         {
             OSL_ENSURE( aClass.isEmpty() || !m_pCSS1Parser->GetClass( aClass ),
                     "Class is not considered" );
@@ -5259,7 +5259,7 @@ void SwHTMLParser::InsertHorzRule()
 
     // ...and save in a context
     std::unique_ptr<HTMLAttrContext> xCntxt(
-        new HTMLAttrContext(HtmlTokenId::HORZRULE, RES_POOLCOLL_HTML_HR, aEmptyOUStr));
+        new HTMLAttrContext(HtmlTokenId::HORZRULE, RES_POOLCOLL_HTML_HR, OUString()));
 
     PushContext(xCntxt);
 
@@ -5427,7 +5427,7 @@ void SwHTMLParser::ParseMoreMetaOptions()
 
     SwPostItField aPostItField(
         static_cast<SwPostItFieldType*>(m_xDoc->getIDocumentFieldsAccess().GetSysFieldType( SwFieldIds::Postit )),
-        aEmptyOUStr, sText.makeStringAndClear(), aEmptyOUStr, aEmptyOUStr, DateTime( DateTime::SYSTEM ) );
+        OUString(), sText.makeStringAndClear(), OUString(), OUString(), DateTime(DateTime::SYSTEM));
     SwFormatField aFormatField( aPostItField );
     InsertAttr( aFormatField,  false );
 }
diff --git a/sw/source/filter/ww8/ww8par3.cxx b/sw/source/filter/ww8/ww8par3.cxx
index 012755119be2..9777bba56ff1 100644
--- a/sw/source/filter/ww8/ww8par3.cxx
+++ b/sw/source/filter/ww8/ww8par3.cxx
@@ -2003,7 +2003,7 @@ void SwWW8ImplReader::Read_LFOPosition(sal_uInt16, const sal_uInt8* pData,
                 // here a paragraph is being directly formatted
 
                 // empty the numbering/list style applied to the current paragraph
-                SwNumRuleItem aEmptyRule( aEmptyOUStr );
+                SwNumRuleItem aEmptyRule;
                 pTextNode->SetAttr( aEmptyRule );
 
                 // create an empty SvxLRSpaceItem