A bit more.

Change-Id: I7617bfa094ba8e6fb2c19944362bd604f5299732

sc/source/core/data/cell.cxx

@@ -723,17 +723,16 @@ void ScFormulaCell::GetFormula( rtl::OUStringBuffer& rBuffer,
              * pCell only if (!this->IsInChangeTrack()),
              * GetEnglishFormula() omitted that test.
              * Can we live without in all cases? */
-            ScBaseCell* pCell;
+            ScFormulaCell* pCell = NULL;
             ScSingleRefData& rRef = p->GetSingleRef();
             rRef.CalcAbsIfRel( aPos );
             if ( rRef.Valid() )
-                pCell = pDocument->GetCell( ScAddress( rRef.nCol,
-                            rRef.nRow, rRef.nTab ) );
-            else
-                pCell = NULL;
-            if (pCell && pCell->GetCellType() == CELLTYPE_FORMULA)
+                pCell = pDocument->GetFormulaCell(
+                    ScAddress(rRef.nCol, rRef.nRow, rRef.nTab));
+
+            if (pCell)
             {
-                ((ScFormulaCell*)pCell)->GetFormula( rBuffer, eGrammar);
+                pCell->GetFormula( rBuffer, eGrammar);
                 return;
             }
             else

sc/source/core/tool/detfunc.cxx

@@ -67,6 +67,7 @@
 #include "rangelst.hxx"
 #include "reftokenhelper.hxx"
 #include "formulaiter.hxx"
+#include "cellvalue.hxx"
 
 #include <vector>
 
@@ -821,14 +822,12 @@ sal_uInt16 ScDetectiveFunc::InsertPredLevelArea( const ScRange& rRef,
 sal_uInt16 ScDetectiveFunc::InsertPredLevel( SCCOL nCol, SCROW nRow, ScDetectiveData& rData,
                                             sal_uInt16 nLevel )
 {
-    ScBaseCell* pCell;
-    pDoc->GetCell( nCol, nRow, nTab, pCell );
-    if (!pCell)
-        return DET_INS_EMPTY;
-    if (pCell->GetCellType() != CELLTYPE_FORMULA)
+    ScRefCellValue aCell;
+    aCell.assign(*pDoc, ScAddress(nCol, nRow, nTab));
+    if (aCell.meType != CELLTYPE_FORMULA)
         return DET_INS_EMPTY;
 
-    ScFormulaCell* pFCell = (ScFormulaCell*)pCell;
+    ScFormulaCell* pFCell = aCell.mpFormula;
     if (pFCell->IsRunning())
         return DET_INS_CIRCULAR;
 
@@ -838,7 +837,7 @@ sal_uInt16 ScDetectiveFunc::InsertPredLevel( SCCOL nCol, SCROW nRow, ScDetective
 
     sal_uInt16 nResult = DET_INS_EMPTY;
 
-    ScDetectiveRefIter aIter( (ScFormulaCell*) pCell );
+    ScDetectiveRefIter aIter(pFCell);
     ScRange aRef;
     while ( aIter.GetNextRef( aRef ) )
     {
@@ -912,14 +911,12 @@ sal_uInt16 ScDetectiveFunc::FindPredLevel( SCCOL nCol, SCROW nRow, sal_uInt16 nL
 {
     OSL_ENSURE( nLevel<1000, "Level" );
 
-    ScBaseCell* pCell;
-    pDoc->GetCell( nCol, nRow, nTab, pCell );
-    if (!pCell)
-        return nLevel;
-    if (pCell->GetCellType() != CELLTYPE_FORMULA)
+    ScRefCellValue aCell;
+    aCell.assign(*pDoc, ScAddress(nCol, nRow, nTab));
+    if (aCell.meType != CELLTYPE_FORMULA)
         return nLevel;
 
-    ScFormulaCell* pFCell = (ScFormulaCell*)pCell;
+    ScFormulaCell* pFCell = aCell.mpFormula;
     if (pFCell->IsRunning())
         return nLevel;
 
@@ -935,7 +932,7 @@ sal_uInt16 ScDetectiveFunc::FindPredLevel( SCCOL nCol, SCROW nRow, sal_uInt16 nL
         DeleteArrowsAt( nCol, nRow, sal_True );                 // Pfeile, die hierher zeigen
     }
 
-    ScDetectiveRefIter aIter( (ScFormulaCell*) pCell );
+    ScDetectiveRefIter aIter(pFCell);
     ScRange aRef;
     while ( aIter.GetNextRef( aRef) )
     {
@@ -974,14 +971,12 @@ sal_uInt16 ScDetectiveFunc::FindPredLevel( SCCOL nCol, SCROW nRow, sal_uInt16 nL
 sal_uInt16 ScDetectiveFunc::InsertErrorLevel( SCCOL nCol, SCROW nRow, ScDetectiveData& rData,
                                             sal_uInt16 nLevel )
 {
-    ScBaseCell* pCell;
-    pDoc->GetCell( nCol, nRow, nTab, pCell );
-    if (!pCell)
-        return DET_INS_EMPTY;
-    if (pCell->GetCellType() != CELLTYPE_FORMULA)
+    ScRefCellValue aCell;
+    aCell.assign(*pDoc, ScAddress(nCol, nRow, nTab));
+    if (aCell.meType != CELLTYPE_FORMULA)
         return DET_INS_EMPTY;
 
-    ScFormulaCell* pFCell = (ScFormulaCell*)pCell;
+    ScFormulaCell* pFCell = aCell.mpFormula;
     if (pFCell->IsRunning())
         return DET_INS_CIRCULAR;
 
@@ -991,7 +986,7 @@ sal_uInt16 ScDetectiveFunc::InsertErrorLevel( SCCOL nCol, SCROW nRow, ScDetectiv
 
     sal_uInt16 nResult = DET_INS_EMPTY;
 
-    ScDetectiveRefIter aIter( (ScFormulaCell*) pCell );
+    ScDetectiveRefIter aIter(pFCell);
     ScRange aRef;
     ScAddress aErrorPos;
     sal_Bool bHasError = false;