Skeleton for generating a hash value from an array of token.

To be implemented...

Change-Id: I4704f06b50dcc9dd5e1af9c3531ecd498015811c

formula/inc/formula/tokenarray.hxx

@@ -93,6 +93,8 @@ public:
     FormulaTokenArray( const FormulaTokenArray& );
     virtual ~FormulaTokenArray();
     FormulaTokenArray* Clone() const;    /// True copy!
+
+    size_t GetHash() const;
     void Clear();
     void DelRPN();
     FormulaToken* First() { nIndex = 0; return Next(); }

formula/source/core/api/token.cxx

@@ -685,6 +685,11 @@ FormulaTokenArray* FormulaTokenArray::Clone() const
     return p;
 }
 
+size_t FormulaTokenArray::GetHash() const
+{
+    return 0;
+}
+
 void FormulaTokenArray::Clear()
 {
     if( nRPN ) DelRPN();

sc/inc/cell.hxx

@@ -427,6 +427,8 @@ public:
 
     ScFormulaCell( const ScFormulaCell& rCell, ScDocument& rDoc, const ScAddress& rPos, int nCloneFlags = SC_CLONECELL_DEFAULT );
 
+    size_t GetHash() const;
+
     void            GetFormula( rtl::OUString& rFormula,
                                 const formula::FormulaGrammar::Grammar = formula::FormulaGrammar::GRAM_DEFAULT ) const;
     void            GetFormula( rtl::OUStringBuffer& rBuffer,

sc/source/core/data/cell.cxx

@@ -884,6 +884,11 @@ ScFormulaCell::~ScFormulaCell()
 #endif
 }
 
+size_t ScFormulaCell::GetHash() const
+{
+    return pCode->GetHash();
+}
+
 void ScFormulaCell::GetFormula( rtl::OUStringBuffer& rBuffer,
                                 const FormulaGrammar::Grammar eGrammar ) const
 {