Replace all OUString("") with OUString()

Change-Id: Ie14c4d76cb61cfbe0410103adfc1afc8ade0f3e0
Reviewed-on: https://gerrit.libreoffice.org/37146
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

57 files changed, 125 insertions, 125 deletions

diff --git a/chart2/source/controller/itemsetwrapper/CharacterPropertyItemConverter.cxx b/chart2/source/controller/itemsetwrapper/CharacterPropertyItemConverter.cxx
index 3bc9114bd8b8..1a5a08f8209b 100644
--- a/chart2/source/controller/itemsetwrapper/CharacterPropertyItemConverter.cxx
+++ b/chart2/source/controller/itemsetwrapper/CharacterPropertyItemConverter.cxx
@@ -293,7 +293,7 @@ void CharacterPropertyItemConverter::FillSpecialItem(
                 rOutItemSet.Put( SfxStringItem( nWhichId, aString ) );
             }
             else
-                rOutItemSet.Put( SfxStringItem( nWhichId, OUString("") ) );
+                rOutItemSet.Put( SfxStringItem( nWhichId, OUString() ) );
         }
         break;
 
diff --git a/comphelper/qa/string/test_string.cxx b/comphelper/qa/string/test_string.cxx
index 7135c81cb0cf..eb36e06355dd 100644
--- a/comphelper/qa/string/test_string.cxx
+++ b/comphelper/qa/string/test_string.cxx
@@ -401,7 +401,7 @@ void TestString::testRemoveAny()
     sal_Unicode const test6 [] = { 'X', 0 };
     CPPUNIT_ASSERT_EQUAL(in, removeAny(in, test6));
     sal_Unicode const test7 [] = { 'A', 'B', 'C', 'a', 'b', 'c', 0 };
-    CPPUNIT_ASSERT_EQUAL(OUString(""), removeAny(in, test7));
+    CPPUNIT_ASSERT_EQUAL(OUString(), removeAny(in, test7));
 }
 
 CPPUNIT_TEST_SUITE_REGISTRATION(TestString);
diff --git a/connectivity/source/drivers/evoab2/NDatabaseMetaData.cxx b/connectivity/source/drivers/evoab2/NDatabaseMetaData.cxx
index 440a62b24d4f..01493a95588b 100644
--- a/connectivity/source/drivers/evoab2/NDatabaseMetaData.cxx
+++ b/connectivity/source/drivers/evoab2/NDatabaseMetaData.cxx
@@ -268,9 +268,9 @@ ODatabaseMetaDataResultSet::ORows& OEvoabDatabaseMetaData::getColumnRows( const
     // ****************************************************
 
     // Catalog
-    aRow[1] = new ORowSetValueDecorator(OUString(""));
+    aRow[1] = new ORowSetValueDecorator(OUString());
     // Schema
-    aRow[2] = new ORowSetValueDecorator(OUString(""));
+    aRow[2] = new ORowSetValueDecorator(OUString());
     // COLUMN_SIZE
     aRow[7] = new ORowSetValueDecorator(s_nCOLUMN_SIZE);
     // BUFFER_LENGTH, not used
diff --git a/connectivity/source/drivers/mork/MDatabaseMetaData.cxx b/connectivity/source/drivers/mork/MDatabaseMetaData.cxx
index 5497693ffed9..bdcfb16d28d0 100644
--- a/connectivity/source/drivers/mork/MDatabaseMetaData.cxx
+++ b/connectivity/source/drivers/mork/MDatabaseMetaData.cxx
@@ -77,9 +77,9 @@ ODatabaseMetaDataResultSet::ORows& SAL_CALL ODatabaseMetaData::getColumnRows(
     // ****************************************************
 
     // Catalog
-    aRow[1] = new ORowSetValueDecorator(OUString(""));
+    aRow[1] = new ORowSetValueDecorator(OUString());
     // Schema
-    aRow[2] = new ORowSetValueDecorator(OUString(""));
+    aRow[2] = new ORowSetValueDecorator(OUString());
     // DATA_TYPE
     aRow[5] = new ORowSetValueDecorator(static_cast<sal_Int16>(DataType::VARCHAR));
     // TYPE_NAME, not used
diff --git a/dtrans/source/win32/clipb/WinClipboard.cxx b/dtrans/source/win32/clipb/WinClipboard.cxx
index a0dd569fb091..5efc5530d46d 100644
--- a/dtrans/source/win32/clipb/WinClipboard.cxx
+++ b/dtrans/source/win32/clipb/WinClipboard.cxx
@@ -97,7 +97,7 @@ OUString SAL_CALL CWinClipboard::getName(  )
     if ( nullptr != m_pImpl.get( ) )
         return m_pImpl->getName( );
 
-    return OUString("");
+    return OUString();
 }
 
 // XFlushableClipboard
diff --git a/editeng/qa/unit/core-test.cxx b/editeng/qa/unit/core-test.cxx
index 9f8421048b86..f620a72d8843 100644
--- a/editeng/qa/unit/core-test.cxx
+++ b/editeng/qa/unit/core-test.cxx
@@ -397,7 +397,7 @@ void Test::testHyperlinkCopyPaste()
 
     // New instance must be empty - no initial text
     CPPUNIT_ASSERT_EQUAL( sal_uLong(0), rDoc.GetTextLen() );
-    CPPUNIT_ASSERT_EQUAL( OUString(""), rDoc.GetParaAsString(sal_Int32(0)) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), rDoc.GetParaAsString(sal_Int32(0)) );
 
     // Get corresponding Field Item for inserting URLs in text
     // URL 1
@@ -524,7 +524,7 @@ void Test::testCopyPaste()
 
     // Initially no text should be there
     CPPUNIT_ASSERT_EQUAL( sal_uLong(0), rDoc.GetTextLen() );
-    CPPUNIT_ASSERT_EQUAL( OUString(""), rDoc.GetParaAsString(sal_Int32(0)) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), rDoc.GetParaAsString(sal_Int32(0)) );
 
     // Set initial text
     OUString aText = "This is custom initial text";
@@ -556,7 +556,7 @@ void Test::testTabsCopyPaste()
 
     // New instance must be empty - no initial text
     CPPUNIT_ASSERT_EQUAL( sal_uLong(0), rDoc.GetTextLen() );
-    CPPUNIT_ASSERT_EQUAL( OUString(""), rDoc.GetParaAsString(sal_Int32(0)) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), rDoc.GetParaAsString(sal_Int32(0)) );
 
     // Get corresponding Item for inserting tabs in the text
     SfxVoidItem aTab( EE_FEATURE_TAB );
@@ -725,7 +725,7 @@ void Test::testBoldItalicCopyPaste()
 
     // New instance must be empty - no initial text
     CPPUNIT_ASSERT_EQUAL( sal_uLong(0), rDoc.GetTextLen() );
-    CPPUNIT_ASSERT_EQUAL( OUString(""), rDoc.GetParaAsString(sal_Int32(0)) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), rDoc.GetParaAsString(sal_Int32(0)) );
 
     // Get corresponding ItemSet for inserting Bold/Italic text
     std::unique_ptr<SfxItemSet> pSet( new SfxItemSet(aEditEngine.GetEmptyItemSet()) );
@@ -931,7 +931,7 @@ void Test::testUnderlineCopyPaste()
 
     // New instance must be empty - no initial text
     CPPUNIT_ASSERT_EQUAL( sal_uLong(0), rDoc.GetTextLen() );
-    CPPUNIT_ASSERT_EQUAL( OUString(""), rDoc.GetParaAsString(sal_Int32(0)) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), rDoc.GetParaAsString(sal_Int32(0)) );
 
     // Get corresponding ItemSet for inserting Underline text
     std::unique_ptr<SfxItemSet> pSet( new SfxItemSet(aEditEngine.GetEmptyItemSet()) );
diff --git a/fpicker/source/office/RemoteFilesDialog.cxx b/fpicker/source/office/RemoteFilesDialog.cxx
index 8b2b267a7e7a..e9c560279d8d 100644
--- a/fpicker/source/office/RemoteFilesDialog.cxx
+++ b/fpicker/source/office/RemoteFilesDialog.cxx
@@ -435,7 +435,7 @@ OUString lcl_GetServiceType( const ServicePtr& pService )
         case INetProtocol::Generic:
             return OUString( "SSH" );
         default:
-            return OUString( "" );
+            return OUString();
     }
 }
 
diff --git a/i18npool/source/defaultnumberingprovider/defaultnumberingprovider.cxx b/i18npool/source/defaultnumberingprovider/defaultnumberingprovider.cxx
index 901dd3048dd7..b5f4917e8781 100644
--- a/i18npool/source/defaultnumberingprovider/defaultnumberingprovider.cxx
+++ b/i18npool/source/defaultnumberingprovider/defaultnumberingprovider.cxx
@@ -627,10 +627,10 @@ DefaultNumberingProvider::makeNumberingString( const Sequence<beans::PropertyVal
                result += OUString::number( number );
                break;
           case NUMBER_NONE:
-               return OUString(""); // ignore prefix and suffix
+               return OUString(); // ignore prefix and suffix
           case CHAR_SPECIAL:
                // apparently, we're supposed to return an empty string in this case...
-               return OUString(""); // ignore prefix and suffix
+               return OUString(); // ignore prefix and suffix
           case PAGE_DESCRIPTOR:
           case BITMAP:
                OSL_ASSERT(false);
diff --git a/include/vcl/ITiledRenderable.hxx b/include/vcl/ITiledRenderable.hxx
index 3592be536d0f..9645d2392743 100644
--- a/include/vcl/ITiledRenderable.hxx
+++ b/include/vcl/ITiledRenderable.hxx
@@ -80,7 +80,7 @@ public:
     virtual OUString getPartName(int nPart)
     {
         (void) nPart;
-        return OUString("");
+        return OUString();
     }
 
     /**
diff --git a/lotuswordpro/source/filter/lwpchangemgr.cxx b/lotuswordpro/source/filter/lwpchangemgr.cxx
index ee1906865eb0..30b272e35ccc 100644
--- a/lotuswordpro/source/filter/lwpchangemgr.cxx
+++ b/lotuswordpro/source/filter/lwpchangemgr.cxx
@@ -109,7 +109,7 @@ OUString LwpChangeMgr::GetChangeID(LwpFrib* pFrib)
     std::map<LwpFrib*,OUString>::iterator iter;
     iter = m_pFribMap->find(pFrib);
     if (iter == m_pFribMap->end())
-        return OUString("");
+        return OUString();
     else
         return iter->second;
 }
diff --git a/lotuswordpro/source/filter/lwpglobalmgr.cxx b/lotuswordpro/source/filter/lwpglobalmgr.cxx
index e3bab7f91073..a8ad1469b430 100644
--- a/lotuswordpro/source/filter/lwpglobalmgr.cxx
+++ b/lotuswordpro/source/filter/lwpglobalmgr.cxx
@@ -136,7 +136,7 @@ OUString LwpGlobalMgr::GetEditorName(sal_uInt8 nID)
     auto iter = m_EditorAttrMap.find(nID);
     if (iter != m_EditorAttrMap.end())
         return iter->second->cName.str();
-    return OUString("");
+    return OUString();
 }
 
 XFColor LwpGlobalMgr::GetHighlightColor(sal_uInt8 nID)
diff --git a/lotuswordpro/source/filter/lwpmarker.cxx b/lotuswordpro/source/filter/lwpmarker.cxx
index 5cf0e9f59060..4d1f85943cc9 100644
--- a/lotuswordpro/source/filter/lwpmarker.cxx
+++ b/lotuswordpro/source/filter/lwpmarker.cxx
@@ -94,7 +94,7 @@ OUString LwpMarker::GetNamedProperty(const OUString& name)
     if (pProp)
         return pProp->GetNamedProperty(name);
     else
-        return OUString("");
+        return OUString();
 }
 
 LwpStoryMarker::LwpStoryMarker(LwpObjectHeader &objHdr, LwpSvStream *pStrm)
@@ -147,7 +147,7 @@ OUString LwpCHBlkMarker::GetPromptText()
         pStory = dynamic_cast<LwpStory*>(m_objPromptStory.obj().get());
     if (pStory)
         return pStory->GetContentText();
-    return OUString("");
+    return OUString();
 }
 
 void LwpCHBlkMarker::ConvertCHBlock(XFContentContainer* pXFPara, sal_uInt8 nType)
diff --git a/lotuswordpro/source/filter/lwpproplist.cxx b/lotuswordpro/source/filter/lwpproplist.cxx
index 2c62f252be8d..3ecc26782201 100644
--- a/lotuswordpro/source/filter/lwpproplist.cxx
+++ b/lotuswordpro/source/filter/lwpproplist.cxx
@@ -90,7 +90,7 @@ OUString LwpPropList::GetNamedProperty(const OUString& name)
     {
         return pProp->GetValue().str();
     }
-    return OUString("");
+    return OUString();
 }
 
 LwpPropListElement* LwpPropList::FindPropByName(const OUString& name)
@@ -125,7 +125,7 @@ OUString LwpPropList::EnumNamedProperty(OUString& name,OUString& value)
             if(pElement)
                 return  pElement->GetName().str();
         }
-        return OUString("");
+        return OUString();
     }
     else
     {
@@ -137,7 +137,7 @@ OUString LwpPropList::EnumNamedProperty(OUString& name,OUString& value)
             if(pElement)
                 return  pElement->GetName().str();
         }
-        return OUString("");
+        return OUString();
     }
 }
 
diff --git a/lotuswordpro/source/filter/lwpstory.cxx b/lotuswordpro/source/filter/lwpstory.cxx
index 61c91b71bb6c..04f0f29ead13 100644
--- a/lotuswordpro/source/filter/lwpstory.cxx
+++ b/lotuswordpro/source/filter/lwpstory.cxx
@@ -436,11 +436,11 @@ OUString LwpStory::GetContentText(bool bAllText)
         {
             LwpPara* pPara = dynamic_cast<LwpPara*>(pObj.get());
             if (!pPara || pPara->GetNext().obj() != nullptr)
-                return OUString("");
+                return OUString();
             pPara->SetFoundry(m_pFoundry);
             return pPara->GetContentText();
         }
-        return  OUString("");
+        return  OUString();
     }
 
 }
@@ -448,7 +448,7 @@ OUString LwpStory::RegisterFirstFribStyle()
 {
     LwpPara* pPara = dynamic_cast<LwpPara*>(GetFirstPara().obj().get());
     if (!pPara)
-        return OUString("");
+        return OUString();
     pPara->SetFoundry(m_pFoundry);
     LwpFribPtr& rFribs = pPara->GetFribs();
     LwpFrib* pFirstFrib = rFribs.GetFribs();
@@ -456,7 +456,7 @@ OUString LwpStory::RegisterFirstFribStyle()
     XFStyleManager* pXFStyleManager = LwpGlobalMgr::GetInstance()->GetXFStyleManager();
     XFTextStyle* pBaseStyle = pXFStyleManager->FindTextStyle(pFirstFrib->GetStyleName());
     if (pBaseStyle == nullptr)
-        return OUString("");
+        return OUString();
     XFTextStyle* pStyle = new XFTextStyle;
     *pStyle = *pBaseStyle;
     OUString sName = "Ruby" + pFirstFrib->GetStyleName();
diff --git a/lotuswordpro/source/filter/xfilter/xfcell.cxx b/lotuswordpro/source/filter/xfilter/xfcell.cxx
index cc21b9b72313..c3552eec646d 100644
--- a/lotuswordpro/source/filter/xfilter/xfcell.cxx
+++ b/lotuswordpro/source/filter/xfilter/xfcell.cxx
@@ -137,12 +137,12 @@ OUString   XFCell::GetCellName()
     XFRow *pRow = m_pOwnerRow;
 
     if( !pRow )
-        return OUString("");
+        return OUString();
 
     XFTable *pTable = pRow->GetOwnerTable();
 
     if( !pTable )
-        return OUString("");
+        return OUString();
 
     OUString name;
     if( pTable->IsSubTable() )
diff --git a/lotuswordpro/source/filter/xfilter/xfutil.cxx b/lotuswordpro/source/filter/xfilter/xfutil.cxx
index 4c6d6ae1889c..f438133dcc81 100644
--- a/lotuswordpro/source/filter/xfilter/xfutil.cxx
+++ b/lotuswordpro/source/filter/xfilter/xfutil.cxx
@@ -149,7 +149,7 @@ OUString   GetUnderlineName(enumXFUnderline type)
         return OUString("samll-wave");
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetReliefName(enumXFRelief type)
@@ -165,7 +165,7 @@ OUString   GetReliefName(enumXFRelief type)
         default:
             break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetCrossoutName(enumXFCrossout type)
@@ -190,7 +190,7 @@ OUString   GetCrossoutName(enumXFCrossout type)
     default:
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetTransformName(enumXFTransform type)
@@ -211,7 +211,7 @@ OUString   GetTransformName(enumXFTransform type)
     default:
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetEmphasizeName(enumXFEmphasize type)
@@ -232,7 +232,7 @@ OUString   GetEmphasizeName(enumXFEmphasize type)
     default:
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetTextDirName(enumXFTextDir dir)
@@ -266,7 +266,7 @@ OUString   GetTextDirName(enumXFTextDir dir)
     default:
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetFrameXPos(enumXFFrameXPos pos)
@@ -288,7 +288,7 @@ OUString   GetFrameXPos(enumXFFrameXPos pos)
     default:
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetFrameXRel(enumXFFrameXRel rel)
@@ -337,7 +337,7 @@ OUString   GetFrameXRel(enumXFFrameXRel rel)
     default:
         break;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetFrameYPos(enumXFFrameYPos pos)
@@ -355,7 +355,7 @@ OUString   GetFrameYPos(enumXFFrameYPos pos)
     case enumXFFrameYPosBelow:
         return OUString("below");
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetFrameYRel(enumXFFrameYRel rel)
@@ -383,7 +383,7 @@ OUString   GetFrameYRel(enumXFFrameYRel rel)
     case enumXFFrameYRelText:
         return OUString("text");
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetAlignName(enumXFAlignType align)
@@ -405,7 +405,7 @@ OUString   GetAlignName(enumXFAlignType align)
     else if( align == enumXFALignMargins )
         return OUString("margins");
 
-    return OUString("");
+    return OUString();
 }
 
 OUString   GetPageUsageName(enumXFPageUsage usage)
@@ -478,7 +478,7 @@ OUString   GetColorMode(enumXFColorMode mode)
     case enumXFColorMono:
         return OUString("mono");
     }
-    return OUString("");
+    return OUString();
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sal/qa/rtl/oustring/rtl_ustr.cxx b/sal/qa/rtl/oustring/rtl_ustr.cxx
index 4fc33eab4218..feedb9da803c 100644
--- a/sal/qa/rtl/oustring/rtl_ustr.cxx
+++ b/sal/qa/rtl/oustring/rtl_ustr.cxx
@@ -466,7 +466,7 @@ namespace rtl_ustr
                 /* sal_Int32 */ nIndex = rtl_ustr_lastIndexOfStr( aStr1.getStr(), aSearchStr.getStr() );
                 CPPUNIT_ASSERT_MESSAGE("index is wrong.", nIndex == 0);
 
-                /* rtl::OString */ aSearchStr = rtl::OUString("");
+                /* rtl::OString */ aSearchStr = rtl::OUString();
                 /* sal_Int32 */ nIndex = rtl_ustr_lastIndexOfStr( aStr1.getStr(), aSearchStr.getStr() );
                 CPPUNIT_ASSERT_MESSAGE("index is wrong.", nIndex == -1);
             }
diff --git a/sax/qa/cppunit/xmlimport.cxx b/sax/qa/cppunit/xmlimport.cxx
index 7296428fabe0..3e362e890111 100644
--- a/sax/qa/cppunit/xmlimport.cxx
+++ b/sax/qa/cppunit/xmlimport.cxx
@@ -125,7 +125,7 @@ OUString TestDocumentHandler::canonicalform(const OUString &sName, const OUStrin
                 return sDefaultns + ":" + sName;
         }
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString TestDocumentHandler::getNamespace(const OUString &sName)
@@ -136,7 +136,7 @@ OUString TestDocumentHandler::getNamespace(const OUString &sName)
         if (aPair.first == sName)
             return aPair.second;
     }
-    return OUString("");
+    return OUString();
 }
 
 void SAL_CALL TestDocumentHandler::startDocument()
diff --git a/sc/qa/unit/helper/qahelper.cxx b/sc/qa/unit/helper/qahelper.cxx
index 6cab0e737d4e..c8ac3457f1f6 100644
--- a/sc/qa/unit/helper/qahelper.cxx
+++ b/sc/qa/unit/helper/qahelper.cxx
@@ -625,7 +625,7 @@ OUString EnsureSeparator(const OUStringBuffer& rFilePath)
 {
     return (rFilePath.getLength() == 0) || (rFilePath[rFilePath.getLength() - 1] != '/') ?
         OUString("/") :
-        OUString("");
+        OUString();
 }
 }
 
diff --git a/sc/qa/unit/subsequent_export-test.cxx b/sc/qa/unit/subsequent_export-test.cxx
index 8665c566820a..b003ca5222f1 100644
--- a/sc/qa/unit/subsequent_export-test.cxx
+++ b/sc/qa/unit/subsequent_export-test.cxx
@@ -3909,7 +3909,7 @@ void ScExportTest::testExtendedLCIDXLSX()
             rDoc.GetNumberFormat(nCol, nRow, 0, nNumberFormat);
             const SvNumberformat* pNumberFormat = pNumFormatter->GetEntry(nNumberFormat);
             const OUString& rFormatStr = pNumberFormat->GetFormatstring();
-            const OUString aExpectedFormatStr = aLang[nRow-1] + ( (nCol==2 && nRow!=3) ? OUString("[NatNum1]") : OUString("") ) + aCalendar[nRow-1];
+            const OUString aExpectedFormatStr = aLang[nRow-1] + ( (nCol==2 && nRow!=3) ? OUString("[NatNum1]") : OUString() ) + aCalendar[nRow-1];
 
             CPPUNIT_ASSERT_EQUAL_MESSAGE("Number format lost extended LCID during Excel export", aExpectedFormatStr, rFormatStr);
         }
diff --git a/sc/qa/unit/ucalc_formula.cxx b/sc/qa/unit/ucalc_formula.cxx
index 2fbf9a6e9805..9ddf37d4f765 100644
--- a/sc/qa/unit/ucalc_formula.cxx
+++ b/sc/qa/unit/ucalc_formula.cxx
@@ -7694,7 +7694,7 @@ void Test::testMatConcat()
     CPPUNIT_ASSERT_EQUAL(OUString("x"),aStr);
     aPos.IncRow();
     aStr = m_pDoc->GetString(aPos);
-    CPPUNIT_ASSERT_EQUAL(OUString(""),aStr);
+    CPPUNIT_ASSERT_EQUAL(OUString(),aStr);
     aPos.IncRow();
     aStr = m_pDoc->GetString(aPos);
     CPPUNIT_ASSERT_EQUAL(OUString("er"),aStr);
diff --git a/sc/source/core/data/dptabsrc.cxx b/sc/source/core/data/dptabsrc.cxx
index 1c4149060ff4..bf1bad34664c 100644
--- a/sc/source/core/data/dptabsrc.cxx
+++ b/sc/source/core/data/dptabsrc.cxx
@@ -1622,9 +1622,9 @@ uno::Any SAL_CALL ScDPDimension::getPropertyValue( const OUString& aPropertyName
             aRet <<= uno::Sequence<sheet::TableFilterField>(0);
     }
     else if (aPropertyName == SC_UNO_DP_LAYOUTNAME)
-        aRet <<= mpLayoutName.get() ? *mpLayoutName : OUString("");
+        aRet <<= mpLayoutName.get() ? *mpLayoutName : OUString();
     else if (aPropertyName == SC_UNO_DP_FIELD_SUBTOTALNAME)
-        aRet <<= mpSubtotalName.get() ? *mpSubtotalName : OUString("");
+        aRet <<= mpSubtotalName.get() ? *mpSubtotalName : OUString();
     else if (aPropertyName == SC_UNO_DP_HAS_HIDDEN_MEMBER)
         aRet <<= mbHasHiddenMember;
     else if (aPropertyName == SC_UNO_DP_FLAGS)
diff --git a/sc/source/filter/orcus/filterdetect.cxx b/sc/source/filter/orcus/filterdetect.cxx
index 5c8c80b190d1..d32c84380afe 100644
--- a/sc/source/filter/orcus/filterdetect.cxx
+++ b/sc/source/filter/orcus/filterdetect.cxx
@@ -46,7 +46,7 @@ OrcusFormatDetect::OrcusFormatDetect()
 
 OUString OrcusFormatDetect::getImplementationName()
 {
-    return OUString("");
+    return OUString();
 }
 
 sal_Bool OrcusFormatDetect::supportsService(const OUString& /*rServiceName*/)
diff --git a/sc/source/ui/condformat/condformathelper.cxx b/sc/source/ui/condformat/condformathelper.cxx
index 12b4e00440a0..0935b05648ff 100644
--- a/sc/source/ui/condformat/condformathelper.cxx
+++ b/sc/source/ui/condformat/condformathelper.cxx
@@ -33,7 +33,7 @@ OUString getTextForType(ScCondFormatEntryType eType)
             break;
     }
 
-    return OUString("");
+    return OUString();
 }
 
 OUString getExpression(sal_Int32 nIndex)
diff --git a/sd/qa/unit/import-tests.cxx b/sd/qa/unit/import-tests.cxx
index 8b980353d5d4..d52eda84d41a 100644
--- a/sd/qa/unit/import-tests.cxx
+++ b/sd/qa/unit/import-tests.cxx
@@ -1207,7 +1207,7 @@ void SdImportTest::testBulletSuffix()
     const EditTextObject& aEdit = pTxtObj->GetOutlinerParaObject()->GetTextObject();
     const SvxNumBulletItem *pNumFmt = dynamic_cast<const SvxNumBulletItem *>(aEdit.GetParaAttribs(1).GetItem(EE_PARA_NUMBULLET));
     CPPUNIT_ASSERT(pNumFmt);
-    CPPUNIT_ASSERT_EQUAL_MESSAGE( "Bullet's suffix is wrong!", OUString(pNumFmt->GetNumRule()->GetLevel(0).GetSuffix()), OUString("") );
+    CPPUNIT_ASSERT_EQUAL_MESSAGE( "Bullet's suffix is wrong!", OUString(pNumFmt->GetNumRule()->GetLevel(0).GetSuffix()), OUString() );
     xDocShRef->DoClose();
 }
 
diff --git a/sd/qa/unit/tiledrendering/tiledrendering.cxx b/sd/qa/unit/tiledrendering/tiledrendering.cxx
index 6242349d3ce0..0a2a2c9e7e2f 100644
--- a/sd/qa/unit/tiledrendering/tiledrendering.cxx
+++ b/sd/qa/unit/tiledrendering/tiledrendering.cxx
@@ -1432,7 +1432,7 @@ void SdTiledRenderingTest::testTdf103083()
     CPPUNIT_ASSERT(pView->GetTextEditObject());
     EditView& rEditView2 = pView->GetTextEditOutlinerView()->GetEditView();
     rEditView2.SetSelection(ESelection(2, 0, 2, 10)); // start para, start char, end para, end char.
-    CPPUNIT_ASSERT_EQUAL(OUString(""), rEditView2.GetSelected());
+    CPPUNIT_ASSERT_EQUAL(OUString(), rEditView2.GetSelected());
 
     // paste contents of bullet item
     comphelper::dispatchCommand(".uno:Paste", uno::Sequence<beans::PropertyValue>());
diff --git a/sd/source/core/TransitionPreset.cxx b/sd/source/core/TransitionPreset.cxx
index b9e9a91aaadf..5bc606d6785e 100644
--- a/sd/source/core/TransitionPreset.cxx
+++ b/sd/source/core/TransitionPreset.cxx
@@ -160,7 +160,7 @@ bool TransitionPreset::importTransitionsFile( TransitionPresetList& rList,
                                 }
 
                                 pPreset->maSetLabel = sSet;
-                                SAL_INFO("sd.transitions", aPresetId << ": " << sGroup << "/" << sSet << (sVariant.isEmpty() ? OUString("") : OUString("/" + sVariant)));
+                                SAL_INFO("sd.transitions", aPresetId << ": " << sGroup << "/" << sSet << (sVariant.isEmpty() ? OUString() : OUString("/" + sVariant)));
 
                                 rList.push_back( pPreset );
                             }
diff --git a/sfx2/source/appl/appserv.cxx b/sfx2/source/appl/appserv.cxx
index b8480b0f6f4d..54a503f5b166 100644
--- a/sfx2/source/appl/appserv.cxx
+++ b/sfx2/source/appl/appserv.cxx
@@ -170,7 +170,7 @@ namespace
                 return OUString( "Draw" );
                 break;
             default:
-                return OUString( "" );
+                return OUString();
                 break;
         }
     }
diff --git a/sfx2/source/dialog/filedlghelper.cxx b/sfx2/source/dialog/filedlghelper.cxx
index 67d8ff728401..0c5e227cf1e7 100644
--- a/sfx2/source/dialog/filedlghelper.cxx
+++ b/sfx2/source/dialog/filedlghelper.cxx
@@ -1575,7 +1575,7 @@ void FileDialogHelper_Impl::getRealFilter( OUString& _rFilter ) const
     {
         std::shared_ptr<const SfxFilter> pFilter =
             mpMatcher->GetFilter4UIName( _rFilter, m_nMustFlags, m_nDontFlags );
-        _rFilter = pFilter ? pFilter->GetFilterName() : OUString("");
+        _rFilter = pFilter ? pFilter->GetFilterName() : OUString();
     }
 }
 
diff --git a/sfx2/source/doc/oleprops.cxx b/sfx2/source/doc/oleprops.cxx
index f1ba967a20fa..318f981ee460 100644
--- a/sfx2/source/doc/oleprops.cxx
+++ b/sfx2/source/doc/oleprops.cxx
@@ -672,7 +672,7 @@ SfxOleDictionaryProperty::SfxOleDictionaryProperty( const SfxOleTextEncoding& rT
 OUString SfxOleDictionaryProperty::GetPropertyName( sal_Int32 nPropId ) const
 {
     SfxOlePropNameMap::const_iterator aIt = maPropNameMap.find( nPropId );
-    return (aIt == maPropNameMap.end()) ? OUString("") : aIt->second;
+    return (aIt == maPropNameMap.end()) ? OUString() : aIt->second;
 }
 
 void SfxOleDictionaryProperty::SetPropertyName( sal_Int32 nPropId, const OUString& rPropName )
diff --git a/sfx2/source/notebookbar/SfxNotebookBar.cxx b/sfx2/source/notebookbar/SfxNotebookBar.cxx
index 15d89bce4205..5574cdec1423 100644
--- a/sfx2/source/notebookbar/SfxNotebookBar.cxx
+++ b/sfx2/source/notebookbar/SfxNotebookBar.cxx
@@ -71,7 +71,7 @@ static OUString lcl_getAppName( vcl::EnumContext::Application eApp )
             return OUString( "Impress" );
             break;
         default:
-            return OUString( "" );
+            return OUString();
             break;
     }
 }
diff --git a/stoc/test/uriproc/test_uriproc.cxx b/stoc/test/uriproc/test_uriproc.cxx
index f60b687132f7..32a5cc322d9c 100644
--- a/stoc/test/uriproc/test_uriproc.cxx
+++ b/stoc/test/uriproc/test_uriproc.cxx
@@ -239,7 +239,7 @@ void Test::testParse() {
                 data[i].pathSegmentCount, uriRef->getPathSegmentCount());
             TEST_ASSERT_EQUAL(
                 "testParse", i, data[i].uriReference,
-                OUString(""), uriRef->getPathSegment(-1));
+                OUString(), uriRef->getPathSegment(-1));
             TEST_ASSERT_EQUAL(
                 "testParse", i, data[i].uriReference,
                 OUString::createFromAscii(data[i].pathSegment0),
diff --git a/sw/qa/core/macros-test.cxx b/sw/qa/core/macros-test.cxx
index ed2324a62053..8ac5c15946ea 100644
--- a/sw/qa/core/macros-test.cxx
+++ b/sw/qa/core/macros-test.cxx
@@ -563,7 +563,7 @@ void SwMacrosTest::testFindReplace()
             opts, false, SwDocPositions::Curr, SwDocPositions::End, bCancel);
     CPPUNIT_ASSERT(bFound);
     CPPUNIT_ASSERT(pPaM->HasMark());
-    CPPUNIT_ASSERT_EQUAL(OUString(""), pPaM->GetText());
+    CPPUNIT_ASSERT_EQUAL(OUString(), pPaM->GetText());
 
     // now do another Find, inside the selection from the first Find
 //    opts.searchFlags = 71680;
@@ -571,7 +571,7 @@ void SwMacrosTest::testFindReplace()
             opts, false, SwDocPositions::Curr, SwDocPositions::End, bCancel, FindRanges::InSel);
     CPPUNIT_ASSERT(bFound);
     CPPUNIT_ASSERT(pPaM->HasMark());
-    CPPUNIT_ASSERT_EQUAL(OUString(""), pPaM->GetText());
+    CPPUNIT_ASSERT_EQUAL(OUString(), pPaM->GetText());
 
     rIDCO.ReplaceRange(*pPaM, " ", true);
 
diff --git a/sw/qa/extras/htmlimport/htmlimport.cxx b/sw/qa/extras/htmlimport/htmlimport.cxx
index b04f7c927b70..216b7f42f12c 100644
--- a/sw/qa/extras/htmlimport/htmlimport.cxx
+++ b/sw/qa/extras/htmlimport/htmlimport.cxx
@@ -106,7 +106,7 @@ DECLARE_HTMLIMPORT_TEST(testInlinedImagesPageAndParagraph, "PageAndParagraphFill
     // due to being loaded embedded. BitmapMode is repeat.
     uno::Reference<beans::XPropertySet> xPageProperties1(getStyles("PageStyles")->getByName("HTML"), uno::UNO_QUERY);
     CPPUNIT_ASSERT_EQUAL(drawing::FillStyle_BITMAP, getProperty<drawing::FillStyle>(xPageProperties1, "FillStyle"));
-    CPPUNIT_ASSERT_EQUAL(OUString(""), getProperty<OUString>(xPageProperties1, "FillBitmapName"));
+    CPPUNIT_ASSERT_EQUAL(OUString(), getProperty<OUString>(xPageProperties1, "FillBitmapName"));
     CPPUNIT_ASSERT_EQUAL(drawing::BitmapMode_REPEAT, getProperty<drawing::BitmapMode>(xPageProperties1, "FillBitmapMode"));
 
     // we should have one paragraph
@@ -121,7 +121,7 @@ DECLARE_HTMLIMPORT_TEST(testInlinedImagesPageAndParagraph, "PageAndParagraphFill
 
         // check for Bitmap FillStyle, name empty, repeat
         CPPUNIT_ASSERT_EQUAL(drawing::FillStyle_BITMAP, getProperty<drawing::FillStyle>(xParagraphProperties, "FillStyle"));
-        CPPUNIT_ASSERT_EQUAL(OUString(""), getProperty<OUString>(xParagraphProperties, "FillBitmapName"));
+        CPPUNIT_ASSERT_EQUAL(OUString(), getProperty<OUString>(xParagraphProperties, "FillBitmapName"));
         CPPUNIT_ASSERT_EQUAL(drawing::BitmapMode_REPEAT, getProperty<drawing::BitmapMode>(xParagraphProperties, "FillBitmapMode"));
     }
 }
diff --git a/sw/qa/extras/mailmerge/mailmerge.cxx b/sw/qa/extras/mailmerge/mailmerge.cxx
index a8f55d9cafdf..9a6c23d1dbdd 100644
--- a/sw/qa/extras/mailmerge/mailmerge.cxx
+++ b/sw/qa/extras/mailmerge/mailmerge.cxx
@@ -440,13 +440,13 @@ DECLARE_FILE_MAILMERGE_TEST(test2Pages, "simple-mail-merge-2pages.odt", "10-test
         CPPUNIT_ASSERT_EQUAL( OUString( "Fixed text." ), getRun( getParagraph( 1 ), 1 )->getString());
         CPPUNIT_ASSERT_EQUAL( lastname, getRun( getParagraph( 2 ), 1 )->getString());
         CPPUNIT_ASSERT_EQUAL( OUString( "Another fixed text." ), getRun( getParagraph( 3 ), 1 )->getString());
-        CPPUNIT_ASSERT_EQUAL( OUString( "" ), getRun( getParagraph( 4 ), 1 )->getString()); // empty para at the end of page 1
+        CPPUNIT_ASSERT_EQUAL( OUString(), getRun( getParagraph( 4 ), 1 )->getString()); // empty para at the end of page 1
         CPPUNIT_ASSERT_EQUAL( OUString( "Second page." ), getRun( getParagraph( 5 ), 1 )->getString());
         CPPUNIT_ASSERT_EQUAL( firstname, getRun( getParagraph( 6 ), 1 )->getString());
         // Also verify the layout.
         CPPUNIT_ASSERT_EQUAL( lastname, parseDump("/root/page[1]/body/txt[2]/Special", "rText"));
         CPPUNIT_ASSERT_EQUAL( OUString( "Fixed text." ), parseDump("/root/page[1]/body/txt[1]", ""));
-        CPPUNIT_ASSERT_EQUAL( OUString( "" ), parseDump("/root/page[1]/body/txt[4]", ""));
+        CPPUNIT_ASSERT_EQUAL( OUString(), parseDump("/root/page[1]/body/txt[4]", ""));
         CPPUNIT_ASSERT_EQUAL( OUString( "Second page." ), parseDump("/root/page[2]/body/txt[1]", ""));
         CPPUNIT_ASSERT_EQUAL( firstname, parseDump("/root/page[2]/body/txt[2]/Special", "rText"));
     }
diff --git a/sw/qa/extras/odfexport/odfexport.cxx b/sw/qa/extras/odfexport/odfexport.cxx
index 2110f549031e..a8a8812508b5 100644
--- a/sw/qa/extras/odfexport/odfexport.cxx
+++ b/sw/qa/extras/odfexport/odfexport.cxx
@@ -863,14 +863,14 @@ DECLARE_ODFEXPORT_TEST(testWhitespace, "whitespace.odt")
     CPPUNIT_ASSERT_EQUAL(OUString("X "), xPortion->getString());
     xPortion.set(xPortions->nextElement(), uno::UNO_QUERY);
     CPPUNIT_ASSERT_EQUAL(OUString("Ruby"), getProperty<OUString>(xPortion, "TextPortionType"));
-    CPPUNIT_ASSERT_EQUAL(OUString(""), xPortion->getString());
+    CPPUNIT_ASSERT_EQUAL(OUString(), xPortion->getString());
     CPPUNIT_ASSERT_EQUAL(OUString("foo"), getProperty<OUString>(xPortion, "RubyText"));
     xPortion.set(xPortions->nextElement(), uno::UNO_QUERY);
     CPPUNIT_ASSERT_EQUAL(OUString("Text"), getProperty<OUString>(xPortion, "TextPortionType"));
     CPPUNIT_ASSERT_EQUAL(OUString(" "), xPortion->getString());
     xPortion.set(xPortions->nextElement(), uno::UNO_QUERY);
     CPPUNIT_ASSERT_EQUAL(OUString("Ruby"), getProperty<OUString>(xPortion, "TextPortionType"));
-    CPPUNIT_ASSERT_EQUAL(OUString(""), xPortion->getString());
+    CPPUNIT_ASSERT_EQUAL(OUString(), xPortion->getString());
     xPortion.set(xPortions->nextElement(), uno::UNO_QUERY);
     CPPUNIT_ASSERT_EQUAL(OUString("Text"), getProperty<OUString>(xPortion, "TextPortionType"));
     CPPUNIT_ASSERT_EQUAL(OUString(" X"), xPortion->getString());
@@ -1318,7 +1318,7 @@ DECLARE_ODFEXPORT_TEST(testTableStyles2, "table_styles_2.odt")
     xCell1Style->getPropertyValue("CharFontName") >>= sString;
     CPPUNIT_ASSERT_EQUAL(OUString("Courier"), sString);
     xCell1Style->getPropertyValue("CharFontStyleName") >>= sString;
-    CPPUNIT_ASSERT_EQUAL(OUString(""), sString);
+    CPPUNIT_ASSERT_EQUAL(OUString(), sString);
     xCell1Style->getPropertyValue("CharFontFamily") >>= nInt16;
     CPPUNIT_ASSERT_EQUAL(sal_Int16(2), nInt16);
     xCell1Style->getPropertyValue("CharFontPitch") >>= nInt16;
@@ -1379,7 +1379,7 @@ DECLARE_ODFEXPORT_TEST(testTableStyles2, "table_styles_2.odt")
     xCell1Style->getPropertyValue("CharFontName") >>= sString;
     CPPUNIT_ASSERT_EQUAL(OUString("Liberation Serif"), sString);
     xCell1Style->getPropertyValue("CharFontStyleName") >>= sString;
-    CPPUNIT_ASSERT_EQUAL(OUString(""), sString);
+    CPPUNIT_ASSERT_EQUAL(OUString(), sString);
     xCell1Style->getPropertyValue("CharFontFamily") >>= nInt16;
     CPPUNIT_ASSERT_EQUAL(sal_Int16(3), nInt16);
     xCell1Style->getPropertyValue("CharFontPitch") >>= nInt16;
@@ -1440,7 +1440,7 @@ DECLARE_ODFEXPORT_TEST(testTableStyles2, "table_styles_2.odt")
     xCell1Style->getPropertyValue("CharFontName") >>= sString;
     CPPUNIT_ASSERT_EQUAL(OUString("Open Sans"), sString);
     xCell1Style->getPropertyValue("CharFontStyleName") >>= sString;
-    CPPUNIT_ASSERT_EQUAL(OUString(""), sString);
+    CPPUNIT_ASSERT_EQUAL(OUString(), sString);
     xCell1Style->getPropertyValue("CharFontFamily") >>= nInt16;
     CPPUNIT_ASSERT_EQUAL(sal_Int16(0), nInt16);
     xCell1Style->getPropertyValue("CharFontPitch") >>= nInt16;
diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport8.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport8.cxx
index 612656cde2ec..9fdad718157e 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport8.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport8.cxx
@@ -1789,7 +1789,7 @@ DECLARE_OOXMLEXPORT_TEST(testFdo85542, "fdo85542.docx")
     // B3 -- testing a collapsed bookmark
     uno::Reference<text::XTextContent> xContent3(xBookmarksByName->getByName("B3"), uno::UNO_QUERY);
     uno::Reference<text::XTextRange> xRange3(xContent3->getAnchor(), uno::UNO_QUERY);
-    CPPUNIT_ASSERT_EQUAL(xRange3->getString(), OUString(""));
+    CPPUNIT_ASSERT_EQUAL(xRange3->getString(), OUString());
     uno::Reference<text::XText> xText(xRange3->getText( ), uno::UNO_QUERY);
     uno::Reference<text::XTextCursor> xNeighborhoodCursor(xText->createTextCursor( ), uno::UNO_QUERY);
     xNeighborhoodCursor->gotoRange(xRange3, false);
diff --git a/sw/qa/extras/rtfexport/rtfexport.cxx b/sw/qa/extras/rtfexport/rtfexport.cxx
index 12cc5e19b806..0eccf65dd748 100644
--- a/sw/qa/extras/rtfexport/rtfexport.cxx
+++ b/sw/qa/extras/rtfexport/rtfexport.cxx
@@ -519,9 +519,9 @@ DECLARE_RTFEXPORT_TEST(testBookmark, "bookmark.rtf")
 
 DECLARE_RTFEXPORT_TEST(testHyperlink, "hyperlink.rtf")
 {
-    CPPUNIT_ASSERT_EQUAL(OUString(""), getProperty<OUString>(getRun(getParagraph(1), 1, "Hello"), "HyperLinkURL"));
+    CPPUNIT_ASSERT_EQUAL(OUString(), getProperty<OUString>(getRun(getParagraph(1), 1, "Hello"), "HyperLinkURL"));
     CPPUNIT_ASSERT_EQUAL(OUString("http://en.wikipedia.org/wiki/World"), getProperty<OUString>(getRun(getParagraph(1), 2, "world"), "HyperLinkURL"));
-    CPPUNIT_ASSERT_EQUAL(OUString(""), getProperty<OUString>(getRun(getParagraph(1), 3, "!"), "HyperLinkURL"));
+    CPPUNIT_ASSERT_EQUAL(OUString(), getProperty<OUString>(getRun(getParagraph(1), 3, "!"), "HyperLinkURL"));
 }
 
 DECLARE_RTFEXPORT_TEST(testHyperlinkTdf100105, "hyperlink_empty.rtf")
@@ -532,7 +532,7 @@ DECLARE_RTFEXPORT_TEST(testHyperlinkTdf100105, "hyperlink_empty.rtf")
     xCursor->gotoStart(false);
     CPPUNIT_ASSERT_EQUAL(OUString("http://example.net"), getProperty<OUString>(xCursor, "HyperLinkURL"));
     // getRun doesn't provide a 0-length hyperlink
-    CPPUNIT_ASSERT_EQUAL(OUString(""), getProperty<OUString>(getRun(getParagraph(1), 1, "foobar"), "HyperLinkURL"));
+    CPPUNIT_ASSERT_EQUAL(OUString(), getProperty<OUString>(getRun(getParagraph(1), 1, "foobar"), "HyperLinkURL"));
 }
 
 DECLARE_RTFEXPORT_TEST(test78758, "fdo78758.rtf")
diff --git a/sw/qa/extras/rtfimport/rtfimport.cxx b/sw/qa/extras/rtfimport/rtfimport.cxx
index 598e4700b733..91625bb5bb28 100644
--- a/sw/qa/extras/rtfimport/rtfimport.cxx
+++ b/sw/qa/extras/rtfimport/rtfimport.cxx
@@ -1734,7 +1734,7 @@ DECLARE_RTFIMPORT_TEST(testContSectionPageBreak, "cont-section-pagebreak.rtf")
     // actually not sure how many paragraph there should be between
     // SECOND and THIRD - important is that the page break is on there
     uno::Reference<text::XTextRange> xParaNext = getParagraph(3);
-    CPPUNIT_ASSERT_EQUAL(OUString(""), xParaNext->getString());
+    CPPUNIT_ASSERT_EQUAL(OUString(), xParaNext->getString());
     //If PageDescName is not empty, a page break / switch to page style is defined
     CPPUNIT_ASSERT(uno::Any() != getProperty<OUString>(xParaNext, "PageDescName"));
     uno::Reference<text::XTextRange> xParaThird = getParagraph(4);
diff --git a/sw/qa/extras/uiwriter/uiwriter.cxx b/sw/qa/extras/uiwriter/uiwriter.cxx
index 89229db942a4..c64e8b124f2e 100644
--- a/sw/qa/extras/uiwriter/uiwriter.cxx
+++ b/sw/qa/extras/uiwriter/uiwriter.cxx
@@ -2115,7 +2115,7 @@ void SwUiWriterTest::testSearchWithTransliterate()
     //transliteration option set so that at least one of the search strings is not found
     sal_uLong case1 = pWrtShell->SearchPattern(SearchOpt,true,SwDocPositions::Start,SwDocPositions::End);
     SwShellCursor* pShellCursor = pWrtShell->getShellCursor(true);
-    CPPUNIT_ASSERT_EQUAL(OUString(""),pShellCursor->GetText());
+    CPPUNIT_ASSERT_EQUAL(OUString(),pShellCursor->GetText());
     CPPUNIT_ASSERT_EQUAL(0,(int)case1);
     SearchOpt.searchString = "paragraph";
     SearchOpt.transliterateFlags = TransliterationFlags::IGNORE_KASHIDA_CTL;
@@ -3553,7 +3553,7 @@ void SwUiWriterTest::testTdf87922()
 struct PortionItem
 {
     PortionItem(OUString const & sItemType, sal_Int32 nLength = 0,
-                sal_uInt16 nTextType = 0, OUString const & sText = OUString(""))
+                sal_uInt16 nTextType = 0, OUString const & sText = OUString())
         : msItemType(sItemType)
         , mnLength(nLength)
         , mnTextType(nTextType)
@@ -4639,10 +4639,10 @@ void SwUiWriterTest::testMsWordCompTrailingBlanks()
     calcLayout();
     // Check that trailing spaces spans have no width if option is enabled
 
-    CPPUNIT_ASSERT_EQUAL( OUString( "" ), parseDump( "/root/page/body/txt[2]/Text[4]", "nWidth" ) );
-    CPPUNIT_ASSERT_EQUAL( OUString( "" ), parseDump( "/root/page/body/txt[2]/Text[5]", "nWidth" ) );
-    CPPUNIT_ASSERT_EQUAL( OUString( "" ), parseDump( "/root/page/body/txt[3]/Text[4]", "nWidth" ) );
-    CPPUNIT_ASSERT_EQUAL( OUString( "" ), parseDump( "/root/page/body/txt[3]/Text[5]", "nWidth" ) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), parseDump( "/root/page/body/txt[2]/Text[4]", "nWidth" ) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), parseDump( "/root/page/body/txt[2]/Text[5]", "nWidth" ) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), parseDump( "/root/page/body/txt[3]/Text[4]", "nWidth" ) );
+    CPPUNIT_ASSERT_EQUAL( OUString(), parseDump( "/root/page/body/txt[3]/Text[5]", "nWidth" ) );
 
     // The option is false in settings.xml
     pDoc = createDoc( "MsWordCompTrailingBlanksFalse.odt" );
diff --git a/sw/qa/extras/ww8export/ww8export.cxx b/sw/qa/extras/ww8export/ww8export.cxx
index 4e70aa3aff16..ebb49f6ae2d1 100644
--- a/sw/qa/extras/ww8export/ww8export.cxx
+++ b/sw/qa/extras/ww8export/ww8export.cxx
@@ -1223,20 +1223,20 @@ DECLARE_WW8EXPORT_TEST(testCommentExport, "comment-export.odt")
         {OUString("Text"), OUString("[B x "), 0},
         {OUString("Annotation"), OUString("Comment on [C..C]"), 2},
         {OUString("Text"), OUString("[C x B]"), 0},
-        {OUString("AnnotationEnd"), OUString(""), 1},
+        {OUString("AnnotationEnd"), OUString(), 1},
         {OUString("Text"), OUString(" x C]"), 0},
-        {OUString("AnnotationEnd"), OUString(""), 2},
+        {OUString("AnnotationEnd"), OUString(), 2},
         {OUString("Text"), OUString(" xx A]"), 0},
-        {OUString("AnnotationEnd"), OUString(""), 0},
+        {OUString("AnnotationEnd"), OUString(), 0},
         {OUString("Text"), OUString(" Comment on a point"), 0},
         {OUString("Annotation"), OUString("Comment on point"), 3},
         {OUString("Text"), OUString("x "), 0},
         {OUString("Annotation"), OUString("Comment on AA...BB"), 4},
         {OUString("Annotation"), OUString("Comment on AAAAAA"), 5},
         {OUString("Text"), OUString("AAAAAA"), 0},
-        {OUString("AnnotationEnd"), OUString(""), 5},
+        {OUString("AnnotationEnd"), OUString(), 5},
         {OUString("Text"), OUString(" BBBBBB"), 0},
-        {OUString("AnnotationEnd"), OUString(""), 4}
+        {OUString("AnnotationEnd"), OUString(), 4}
     };
 
     OUString sNames[6];
diff --git a/sw/source/filter/ww8/ww8par3.cxx b/sw/source/filter/ww8/ww8par3.cxx
index 401daf475a19..03b5ea95e532 100644
--- a/sw/source/filter/ww8/ww8par3.cxx
+++ b/sw/source/filter/ww8/ww8par3.cxx
@@ -2483,7 +2483,7 @@ static void lcl_AddToPropertyContainer
     {
         uno::Reference<beans::XPropertyContainer>
             xPropContainer(xPropSet, uno::UNO_QUERY);
-        uno::Any aAny(OUString(""));
+        uno::Any aAny((OUString()));
         xPropContainer->addProperty
             (rPropertyName,
              static_cast<sal_Int16>(beans::PropertyAttribute::BOUND |
diff --git a/test/source/sheet/xsheetoutline.cxx b/test/source/sheet/xsheetoutline.cxx
index 406f0cb30087..1a03fb7b7613 100644
--- a/test/source/sheet/xsheetoutline.cxx
+++ b/test/source/sheet/xsheetoutline.cxx
@@ -79,14 +79,14 @@ void XSheetOutline::testHideDetail()
     aSheetOutline->hideDetail(aLevelRangeAddress);
 
     CPPUNIT_ASSERT_EQUAL_MESSAGE("Column level 2 not hidden",
-            getVisibleAdress(aSheet, colLevel2), OUString(""));
+            getVisibleAdress(aSheet, colLevel2), OUString());
 
     // Row Level 2
     aLevelRangeAddress = getAddressFromRangeString(aSheet, rowLevel2);
     aSheetOutline->hideDetail(aLevelRangeAddress);
 
     CPPUNIT_ASSERT_EQUAL_MESSAGE("Row level 2 not hidden",
-            getVisibleAdress(aSheet, rowLevel2), OUString(""));
+            getVisibleAdress(aSheet, rowLevel2), OUString());
 
 }
 
@@ -145,7 +145,7 @@ void XSheetOutline::testShowLevel()
 
     CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Column", OUString("OutlineSheet.A1:D1"), getVisibleAdress(aSheet, "OutlineSheet.A1:D1"));
     CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Column", OUString("OutlineSheet.V1:Z1"), getVisibleAdress(aSheet, "OutlineSheet.V1:Z1"));
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Column", OUString(""), getVisibleAdress(aSheet, colLevel3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Column", OUString(), getVisibleAdress(aSheet, colLevel3));
 
 /* FIXME !!
 
@@ -178,7 +178,7 @@ void XSheetOutline::testShowLevel()
 
     CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Row", OUString("OutlineSheet.A1:A4"), getVisibleAdress("OutlineSheet.A1:A4"));
     CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Row", OUString("OutlineSheet.A25:A30"), getVisibleAdress("OutlineSheet.A25:A30"));
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Row", OUString(""), getVisibleAdress(rowLevel3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("testShowLevel Row", OUString(), getVisibleAdress(rowLevel3));
 
 */
 
@@ -197,7 +197,7 @@ void XSheetOutline::testGroup()
 
     aSheetOutline->hideDetail(aLevelRangeAddress);
 
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("testGroup Column still visible", getVisibleAdress(aSheet, aNewString), OUString(""));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("testGroup Column still visible", getVisibleAdress(aSheet, aNewString), OUString());
 
     // Row Level 2
     aNewString = "OutlineSheet.A50:A60";
@@ -206,7 +206,7 @@ void XSheetOutline::testGroup()
 
     aSheetOutline->hideDetail(aLevelRangeAddress);
 
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("testGroup Row still visible", getVisibleAdress(aSheet, aNewString), OUString(""));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("testGroup Row still visible", getVisibleAdress(aSheet, aNewString), OUString());
 
 }
 
@@ -226,7 +226,7 @@ void XSheetOutline::testUngroup()
     aSheetOutline->showDetail(aLevelRangeAddress);
     // should remain hidden ?
 
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("testUnGroup Column becomes visible after ungroup", getVisibleAdress(aSheet, aNewString), OUString(""));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("testUnGroup Column becomes visible after ungroup", getVisibleAdress(aSheet, aNewString), OUString());
 
     // New Row level
     aNewString = "OutlineSheet.A70:A80";
@@ -239,7 +239,7 @@ void XSheetOutline::testUngroup()
     aSheetOutline->showDetail(aLevelRangeAddress);
     // should remain hidden ?
 
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("testUnGroup Row becomes visible after ungroup", getVisibleAdress(aSheet, aNewString), OUString(""));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("testUnGroup Row becomes visible after ungroup", getVisibleAdress(aSheet, aNewString), OUString());
 
 }
 
diff --git a/tools/qa/cppunit/test_color.cxx b/tools/qa/cppunit/test_color.cxx
index 2c8726eff7fa..d0f0e173f9a7 100644
--- a/tools/qa/cppunit/test_color.cxx
+++ b/tools/qa/cppunit/test_color.cxx
@@ -82,7 +82,7 @@ OUString createTintShade(sal_uInt8 nR, sal_uInt8 nG, sal_uInt8 nB, OUString cons
 {
     Color aColor(nR, nG, nB);
     if (sReference != aColor.AsRGBHexString())
-        return OUString("");
+        return OUString();
     aColor.ApplyTintOrShade(nTintShade);
     return aColor.AsRGBHexString();
 }
diff --git a/unotools/source/config/compatibility.cxx b/unotools/source/config/compatibility.cxx
index 285a021d98d6..91b3e53e5929 100644
--- a/unotools/source/config/compatibility.cxx
+++ b/unotools/source/config/compatibility.cxx
@@ -44,8 +44,8 @@ SvtCompatibilityEntry::SvtCompatibilityEntry()
     : m_aPropertyValue( SvtCompatibilityEntry::getElementCount() )
 {
     /* Should be in the start. Do not remove it. */
-    setValue<OUString>( Index::Name, OUString("") );
-    setValue<OUString>( Index::Module, OUString("") );
+    setValue<OUString>( Index::Name, OUString() );
+    setValue<OUString>( Index::Module, OUString() );
 
     /* Editable list of default values. Sync it with the SvtCompatibilityEntry::Index enum class. */
     setValue<bool>( Index::UsePrtMetrics, false );
diff --git a/vcl/headless/svpinst.cxx b/vcl/headless/svpinst.cxx
index e84316045ab5..8e9cdbc9543c 100644
--- a/vcl/headless/svpinst.cxx
+++ b/vcl/headless/svpinst.cxx
@@ -417,7 +417,7 @@ SalSession* SvpSalInstance::CreateSalSession()
 
 OUString SvpSalInstance::GetConnectionIdentifier()
 {
-    return OUString("");
+    return OUString();
 }
 
 void SvpSalInstance::StopTimer()
diff --git a/vcl/osx/salinst.cxx b/vcl/osx/salinst.cxx
index 53b529e0b67e..b3b97e5ee01d 100644
--- a/vcl/osx/salinst.cxx
+++ b/vcl/osx/salinst.cxx
@@ -916,7 +916,7 @@ void AquaSalInstance::DestroyInfoPrinter( SalInfoPrinter* pPrinter )
 
 OUString AquaSalInstance::GetConnectionIdentifier()
 {
-    return OUString("");
+    return OUString();
 }
 
 // We need to re-encode file urls because osl_getFileURLFromSystemPath converts
diff --git a/vcl/source/app/IconThemeInfo.cxx b/vcl/source/app/IconThemeInfo.cxx
index 3c886be55142..88171e985bc3 100644
--- a/vcl/source/app/IconThemeInfo.cxx
+++ b/vcl/source/app/IconThemeInfo.cxx
@@ -31,7 +31,7 @@ filename_from_url(const OUString& url)
 {
     sal_Int32 slashPosition = url.lastIndexOf( '/' );
     if (slashPosition < 0) {
-        return OUString("");
+        return OUString();
     }
     OUString filename = url.copy( slashPosition+1 );
     return filename;
diff --git a/vcl/source/app/svapp.cxx b/vcl/source/app/svapp.cxx
index 90cb5d10a7ed..b6b74b8eac6e 100644
--- a/vcl/source/app/svapp.cxx
+++ b/vcl/source/app/svapp.cxx
@@ -1229,7 +1229,7 @@ OUString Application::GetDisplayName()
     else if ( pSVData->maWinData.mpAppWin )
         return pSVData->maWinData.mpAppWin->GetText();
     else
-        return OUString("");
+        return OUString();
 }
 
 unsigned int Application::GetScreenCount()
diff --git a/vcl/source/edit/vclmedit.cxx b/vcl/source/edit/vclmedit.cxx
index c48808c2a942..d699a74658aa 100644
--- a/vcl/source/edit/vclmedit.cxx
+++ b/vcl/source/edit/vclmedit.cxx
@@ -1220,17 +1220,17 @@ void VclMultiLineEdit::SetText( const OUString& rStr )
 
 OUString VclMultiLineEdit::GetText() const
 {
-    return pImpVclMEdit ? pImpVclMEdit->GetText() : OUString("");
+    return pImpVclMEdit ? pImpVclMEdit->GetText() : OUString();
 }
 
 OUString VclMultiLineEdit::GetText( LineEnd aSeparator ) const
 {
-    return pImpVclMEdit ? pImpVclMEdit->GetText( aSeparator ) : OUString("");
+    return pImpVclMEdit ? pImpVclMEdit->GetText( aSeparator ) : OUString();
 }
 
 OUString VclMultiLineEdit::GetTextLines( LineEnd aSeparator ) const
 {
-    return pImpVclMEdit ? pImpVclMEdit->GetTextLines( aSeparator ) : OUString("");
+    return pImpVclMEdit ? pImpVclMEdit->GetTextLines( aSeparator ) : OUString();
 }
 
 void VclMultiLineEdit::Resize()
diff --git a/vcl/source/filter/FilterConfigCache.cxx b/vcl/source/filter/FilterConfigCache.cxx
index ab2196dca922..8c3fbecb1acb 100644
--- a/vcl/source/filter/FilterConfigCache.cxx
+++ b/vcl/source/filter/FilterConfigCache.cxx
@@ -313,7 +313,7 @@ OUString FilterConfigCache::GetImportFilterName( sal_uInt16 nFormat )
 {
     if( nFormat < aImport.size() )
         return aImport[ nFormat ].sFilterName;
-    return OUString("");
+    return OUString();
 }
 
 sal_uInt16 FilterConfigCache::GetImportFormatNumber( const OUString& rFormatName )
@@ -369,42 +369,42 @@ OUString FilterConfigCache::GetImportFormatName( sal_uInt16 nFormat )
 {
     if( nFormat < aImport.size() )
         return aImport[ nFormat ].sUIName;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetImportFormatMediaType( sal_uInt16 nFormat )
 {
     if( nFormat < aImport.size() )
         return aImport[ nFormat ].sMediaType;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetImportFormatShortName( sal_uInt16 nFormat )
 {
     if( nFormat < aImport.size() )
         return aImport[ nFormat ].GetShortName();
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetImportFormatExtension( sal_uInt16 nFormat, sal_Int32 nEntry )
 {
     if ( (nFormat < aImport.size()) && (nEntry < aImport[ nFormat ].lExtensionList.getLength()) )
         return aImport[ nFormat ].lExtensionList[ nEntry ];
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetImportFilterType( sal_uInt16 nFormat )
 {
     if( nFormat < aImport.size() )
         return aImport[ nFormat ].sType;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetImportFilterTypeName( sal_uInt16 nFormat )
 {
     if( nFormat < aImport.size() )
         return aImport[ nFormat ].sFilterType;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetExternalFilterName(sal_uInt16 nFormat, bool bExport)
@@ -419,7 +419,7 @@ OUString FilterConfigCache::GetExternalFilterName(sal_uInt16 nFormat, bool bExpo
         if (nFormat < aImport.size())
             return aImport[nFormat].sExternalFilterName;
     }
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetImportWildcard(sal_uInt16 nFormat, sal_Int32 nEntry)
@@ -439,7 +439,7 @@ OUString FilterConfigCache::GetExportFilterName( sal_uInt16 nFormat )
 {
     if( nFormat < aExport.size() )
         return aExport[ nFormat ].sFilterName;
-    return OUString("");
+    return OUString();
 }
 
 sal_uInt16 FilterConfigCache::GetExportFormatNumber(const OUString& rFormatName)
@@ -491,35 +491,35 @@ OUString FilterConfigCache::GetExportFormatName( sal_uInt16 nFormat )
 {
     if( nFormat < aExport.size() )
         return aExport[ nFormat ].sUIName;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetExportFormatMediaType( sal_uInt16 nFormat )
 {
     if( nFormat < aExport.size() )
         return aExport[ nFormat ].sMediaType;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetExportFormatShortName( sal_uInt16 nFormat )
 {
     if( nFormat < aExport.size() )
         return aExport[ nFormat ].GetShortName();
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetExportFormatExtension( sal_uInt16 nFormat, sal_Int32 nEntry )
 {
     if ( (nFormat < aExport.size()) && (nEntry < aExport[ nFormat ].lExtensionList.getLength()) )
         return aExport[ nFormat ].lExtensionList[ nEntry ];
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetExportInternalFilterName( sal_uInt16 nFormat )
 {
     if( nFormat < aExport.size() )
         return aExport[ nFormat ].sInternalFilterName;
-    return OUString("");
+    return OUString();
 }
 
 OUString FilterConfigCache::GetExportWildcard( sal_uInt16 nFormat, sal_Int32 nEntry )
diff --git a/vcl/unx/generic/app/salinst.cxx b/vcl/unx/generic/app/salinst.cxx
index 1bee05ab01ac..c63274db4e4d 100644
--- a/vcl/unx/generic/app/salinst.cxx
+++ b/vcl/unx/generic/app/salinst.cxx
@@ -176,7 +176,7 @@ SalYieldResult X11SalInstance::DoYield(bool bWait, bool bHandleAllCurrentEvents,
 OUString X11SalInstance::GetConnectionIdentifier()
 {
     static const char* pDisplay = getenv( "DISPLAY" );
-    return pDisplay ? OUString::createFromAscii(pDisplay) : OUString("");
+    return pDisplay ? OUString::createFromAscii(pDisplay) : OUString();
 }
 
 SalFrame *X11SalInstance::CreateFrame( SalFrame *pParent, SalFrameStyleFlags nSalFrameStyle )
diff --git a/vcl/win/app/salinst.cxx b/vcl/win/app/salinst.cxx
index 556199843869..e087b4d1d99b 100644
--- a/vcl/win/app/salinst.cxx
+++ b/vcl/win/app/salinst.cxx
@@ -892,7 +892,7 @@ void WinSalInstance::DestroyObject( SalObject* pObject )
 
 OUString WinSalInstance::GetConnectionIdentifier()
 {
-    return OUString("");
+    return OUString();
 }
 
 /** Add a file to the system shells recent document list if there is any.
diff --git a/writerfilter/source/dmapper/DomainMapper_Impl.cxx b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
index 8ad1090cd925..41788537021c 100644
--- a/writerfilter/source/dmapper/DomainMapper_Impl.cxx
+++ b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
@@ -2961,7 +2961,7 @@ if(!bFilled)
             {OUString("BIBLIOGRAPHY"), "com.sun.star.text.Bibliography", FIELD_BIBLIOGRAPHY},
             {OUString("CITATION"), "com.sun.star.text.TextField.Bibliography", FIELD_CITATION},
 
-//            {OUString(""), "", "", FIELD_},
+//            {OUString(), "", "", FIELD_},
 
         };
         size_t nConversions = SAL_N_ELEMENTS(aFields);
diff --git a/writerfilter/source/dmapper/ThemeTable.cxx b/writerfilter/source/dmapper/ThemeTable.cxx
index 9c162c4d5489..c66777f16651 100644
--- a/writerfilter/source/dmapper/ThemeTable.cxx
+++ b/writerfilter/source/dmapper/ThemeTable.cxx
@@ -552,7 +552,7 @@ OUString ThemeTable::fromLCIDToScriptTag(LanguageType lang)
         case 0x478  :  // lidYi
             return OUString("Yiii");
         default:
-            return OUString("");
+            return OUString();
     }
 }
 
diff --git a/writerfilter/source/filter/WriterFilter.cxx b/writerfilter/source/filter/WriterFilter.cxx
index ef83ebe2686c..ff2586c7d3a3 100644
--- a/writerfilter/source/filter/WriterFilter.cxx
+++ b/writerfilter/source/filter/WriterFilter.cxx
@@ -153,7 +153,7 @@ sal_Bool WriterFilter::filter(const uno::Sequence< beans::PropertyValue >& aDesc
     {
         utl::MediaDescriptor aMediaDesc(aDescriptor);
         bool bRepairStorage = aMediaDesc.getUnpackedValueOrDefault("RepairPackage", false);
-        bool bSkipImages = aMediaDesc.getUnpackedValueOrDefault("FilterOptions", OUString("")) == "SkipImages";
+        bool bSkipImages = aMediaDesc.getUnpackedValueOrDefault("FilterOptions", OUString()) == "SkipImages";
 
         uno::Reference< io::XInputStream > xInputStream;
         try
diff --git a/xmlsecurity/source/gpg/SecurityEnvironment.cxx b/xmlsecurity/source/gpg/SecurityEnvironment.cxx
index 6517c35d725e..6ad51f97302e 100644
--- a/xmlsecurity/source/gpg/SecurityEnvironment.cxx
+++ b/xmlsecurity/source/gpg/SecurityEnvironment.cxx
@@ -54,7 +54,7 @@ const Sequence< sal_Int8>& SecurityEnvironmentGpg::getUnoTunnelId() {
 
 OUString SecurityEnvironmentGpg::getSecurityEnvironmentInformation()
 {
-    return OUString("");
+    return OUString();
 }
 
 Sequence< Reference < XCertificate > > SecurityEnvironmentGpg::getPersonalCertificates()